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Use the commands described in this chapter to configure access to Frame Relay networks.
For Frame Relay configuration information and examples, refer to the "Configuring Frame Relay" chapter in the Router Products Configuration Guide.
To clear dynamically created Frame Relay maps, which are created by the use of Inverse ARP, use the clear frame-relay-inarp EXEC command.
clear frame-relay-inarpThis command has no arguments or keywords.
EXEC
The following example clears dynamically created Frame Relay maps:
clear frame-relay-inarp
frame-relay inverse-arp
show frame-relay map
To enable Frame Relay encapsulation, use the encapsulation frame-relay interface configuration command. To disable Frame Relay encapsulation, use the no form of this command.
encapsulation frame-relay [cisco | ietf]Enabled
Interface configuration
Use this command with no keywords to restore the default Cisco encapsulation.
The following example configures Cisco Frame Relay encapsulation on interface serial 1:
interface serial 1 encapsulation frame-relay
Use the ietf keyword if your router is connected to another vendor's equipment across a Frame Relay network to conform with RFC 1490:
interface serial 1 encapsulation frame-relay ietf
To create a special queue for a specified interface to hold broadcast traffic that has been replicated for transmission on multiple DLCIs, use the frame-relay broadcast-queue interface configuration command.
frame-relay broadcast-queue size byte-rate packet-rate| size | Number of packets to hold in the broadcast queue. The default is 64 packets. |
| byte-rate | Maximum number of bytes to be transmitted per second. The default is 256000 bytes per second. |
| packet-rate | Maximum number of packets to be transmitted per second. The default is 36 packets per second. |
The default values are as follows:
size--64 packets
byte-rate--256000 bytes per second
packet-rate--36 packets per second
Interface configuration
For purposes of the Frame Relay broadcast queue, broadcast traffic is defined as packets that have been replicated for transmission on multiple DLCIs, but it does not include the original routing packet or SAP packet, which passes through the normal queue. Due to timing sensitivity, bridged broadcasts and spanning tree packets are sent through the normal queue.
The Frame Relay broadcast queue is managed independently of the normal interface queue. It has its own buffers and a configurable service rate.
A broadcast queue is given a maximum transmission rate (throughput) limit measured in bytes per second and packets per second. The queue is serviced to ensure that only this maximum is provided. The broadcast queue has priority when transmitting at a rate below the configured maximum, and hence has a guaranteed minimum bandwidth allocation. The two transmission rate limits are intended to avoid flooding the interface with broadcasts. The actual limit in any second is the first rate limit that is reached.
Given the transmission rate restriction, additional buffering will be required to store broadcast packets. The broadcast queue is configurable to store large numbers of broadcast packets.
The queue size should be set to avoid loss of broadcast routing update packets. The exact size will depend on the protocol being used and the number of packets required for each update. To be safe, set the queue size so that one complete routing update from each protocol and for each DLCI can be stored. As a general rule, start with 20 packets per DLCI.
As a general rule, the byte rate should be less than both of the following:
The packet rate is not critical if you set the byte rate conservatively. As a general rule, set the packet rate assuming 250-byte packets.
The following example specifies a broadcast queue to hold 80 packets, to have a maximum byte transmission rate of 240,000 bytes per second, and to have a maximum packet transmission rate of 160 packets per second:
frame-relay broadcast-queue 80 240000 160
To specify the discard eligibility (DE) group number to be used for a specified DLCI, use the frame-relay de-group interface configuration command. To disable a previously defined group number assigned to a specified DLCI, use the no form of the command with the relevant keyword and arguments.
frame-relay de-group group-number dlci| group-number | DE group number to apply to the specified DLCI number, in the range from 1 through 10. |
| dlci | DLCI number. |
No DE group is defined.
Interface configuration
To disable all previously defined group numbers, use the no form of this command with no arguments.
This command requires that Frame Relay software be enabled.
The DE bit is not set or recognized by the Frame Relay switching code, but must be recognized and interpreted by the Frame Relay network.
The following example specifies that group number 3 will be used for DLCI 170:
frame-relay de-group 3 170
frame-relay de-list
To define a discard eligibility (DE) list specifying which packets will have the DE bit set and thus will be eligible for discarding when congestion is experienced on the Frame Relay switch, use the frame-relay de-list global configuration command. To delete a portion of a previously defined DE list, use the no form of this command.
frame-relay de-list list-number {protocol protocol | interface type number} characteristic| list-number | Number of the DE list. |
| protocol protocol | One of the following keywords corresponding to a supported protocol or device: arp--Address Resolution Protocol. apollo--Apollo Domain. appletalk--AppleTalk. bridge--bridging device. clns--ISO Connectionless Network Service. clns_es--CLNS end systems. clns_is--CLNS intermediate systems. compressedtcp--Compressed TCP. decnet--DECnet. decnet_node--DECnet end node. decnet_router-L1--DECnet Level 1 (intra-area) router. decnet_router-L2--DECnet Level 2 (interarea) router. ip--Internet Protocol. ipx--Novell Internet Packet Exchange. vines--Banyan VINES. xns--Xerox Network Systems. |
| interface type | One of the following interface types: serial, null, or ethernet. |
| number | Interface number. |
| characteristic | One of the following:
fragments--Classify fragmented IP packets. |
Discard eligibility is not defined.
Global configuration
To remove an entire DE list, use the no form of this command with no options and arguments.
This prioritization feature requires that the Frame Relay network be able to interpret the DE bit as indicating which packets can be dropped first in case of congestion or which packets are less time sensitive or both.
The following example specifies that IP packets larger than 512 bytes will have the discard eligibility bit set.
frame-relay de-list 1 protocol ip gt 512
To assign a data link connection identifier (DLCI) to a specified Frame Relay subinterface on the router, use the frame-relay interface-dlci interface configuration command. To remove this assignment, use the no form of this command.
frame-relay interface-dlci dlci [option]| dlci | A DLCI number to be used on the specified subinterface. |
| option | (Optional) Broadcast or encapsulation keyword defined in Table 9-1. |
| protocol ip ip-address | Indicates the IP address of the serial interface of a new router onto which a router configuration file is to be autoinstalled over a Frame Relay network. Use this option only when this router will act as the BOOTP server for autoinstallation over Frame Relay. |
No DLCI is assigned.
Interface configuration
Use this command only for subinterfaces on a router. Use of the command on an interface, rather than a subinterface, will prevent the router from forwarding packets intended for that DLCI.
Subinterfaces are logical interfaces associated with a physical interface.You must specify the interface and subinterface before you can use this command to assign any DLCIs and any encapsulation or broadcast options. See the "Example" section for the sequence of commands.
This command is required for all point-to-point subinterfaces; it is also required for multipoint subinterfaces for which dynamic address resolution is enabled. It is not required for multipoint subinterfaces configured with static address mappings.
Use the protocol ip ip-address option only when this router will act as the BOOTP server for autoinstallation over Frame Relay.
For more information about autoinstalling router configuration files over a Frame Relay network, see the "Loading System Images, Microcode Images, and Configuration Files" chapter in the Router Products Configuration Guide.
Table 9-1 lists the frame-relay interface-dlci option keywords.
| Keyword | Option |
|---|---|
| broadcast | Broadcasts should be forwarded out through this interface. |
| ietf | IETF Frame Relay encapsulation. |
| cisco | Cisco Frame Relay encapsulation. |
The following example assigns DLCI 100 to serial subinterface 5.17:
! Enter interface configuration and begin assignments on interface serial 5 interface serial 5 ! Enter subinterface configuration by assigning subinterface 17 interface serial 5.17 ! Now assign a DLCI number to subinterface 5.17 frame-relay interface-dlci 100
Use the frame-relay intf-type interface configuration command to configure a Frame Relay switch type. Use the no form of this command to disable the switch.
frame-relay intf-type [dce | dte | nni]dte
Interface configuration
This command can be used only if Frame Relay switching has previously been enabled globally by use of the frame-relay switching command.
The following example configures a DTE switch type:
frame-relay switching ! interface serial 2 frame-relay intf-type dte
If the Inverse Address Resolution Protocol (Inverse ARP) was previously disabled on a router configured for Frame Relay, use the frame-relay inverse-arp interface configuration command to reenable Inverse ARP on a specified interface or subinterface. Use the no form of this command to disable this feature.
frame-relay inverse-arp [protocol] [dlci]| protocol | Supported protocols: appletalk, decnet, ip, ipx, vines, and xns. |
| dlci | One of the DLCI numbers used on the interface. Acceptable numbers are integers in the range 16 through 1007. |
Enabled.
Interface configuration
To enable Inverse ARP for all protocols that were enabled before the prior no frame-relay inverse-arp command was issued, use the frame-relay inverse-arp command without arguments. To disable Inverse ARP for all protocols of a router interface, use the no frame-relay inverse-arp command without arguments.
To enable or disable Inverse ARP for a specific protocol and DLCI pair, use both the protocol and dlci arguments. To enable or disable Inverse ARP for all protocols on a DLCI, use only the dlci argument. To enable or disable Inverse ARP for a protocol for all DLCIs on the specified interface or subinterface, use only the protocol argument.
This implementation of Inverse ARP is based on RFC 1293. It allows a router running Frame Relay to discover the protocol address of a device associated with the virtual circuit.
In Frame Relay, permanent virtual circuits are identified by a DLCI, which is the equivalent of a hardware address. By exchanging signaling messages, a network announces a new virtual circuit, and with Inverse ARP, the protocol address at the other side of the circuit can be discovered.
The show frame-relay map command displays the word "dynamic" to flag virtual circuits that are created dynamically by Inverse ARP.
The following example sets Inverse ARP on an interface running AppleTalk:
interface serial 0 frame-relay inverse-arp appletalk 100
clear frame-relay-inarp
show frame-relay map
To configure an interface to ensure that the associated PVC will always carry outgoing TCP/IP headers in compressed form, use the frame-relay ip tcp header-compression interface configuration command. To disable compression of TCP/IP packet headers on the interface, use the no form of this command.
frame-relay ip tcp header-compression [passive]| passive | (Optional) Compresses the outgoing TCP/IP packet header only if an incoming packet had a compressed header. |
Active TCP/IP header compression; all outgoing TCP/IP packets are subjected to header compression.
Interface configuration
This command applies to interfaces that support Frame Relay encapsulation, specifically serial ports and HSSI.
Frame Relay must be configured on the interface before this command can be used.
TCP/IP header compression and IETF encapsulation are mutually exclusive. If an interface is changed to IETF encapsulation, all encapsulation and compression characteristics are lost.
When you use this command to enable TCP/IP header compression, every IP map inherits the compression characteristics of the interface, unless header compression is explicitly rejected or modified by use of the frame-relay map ip tcp header compression command.
The following example configures serial interface 1 to use the default encapsulation (cisco) and passive TCP header compression:
interface serial 1 encapsulation frame-relay frame-relay ip tcp header-compression passive
frame-relay map ip tcp header-compression
To enable the local management interface (LMI) mechanism for serial lines using Frame Relay encapsulation, use the frame-relay keepalive interface configuration command. Use the
no form of this command to disable this capability.
| number | An integer that defines the keepalive interval. The interval must be set and must be less than the interval set on the switch; see the frame-relay lmi-t392dce command description. |
10 seconds
Interface configuration
The frame-relay keepalive and keepalive commands perform the same function; both commands enable the keepalive sequence. The keepalive sequence is part of the Local Management Interface (LMI) protocol, so these commands also control the enabling and disabling of the LMI.
When viewing the configuration information using the show configuration command, only the keepalive command setting is included; you will not see the frame-relay keepalive setting.
The following example sets the keepalive timer on the server for a period that is two or three seconds faster (shorter interval) than the interval set on the keepalive timer of the Frame Relay switch. The difference in keepalive intervals ensures proper synchronization between the Cisco server and the Frame Relay switch.
interface serial 3
frame-relay keepalive 8
A dagger (+) indicates that the command is documented in another chapter.
keepalive +
frame-relay lmi-t392dce
To set a full status polling interval, use the frame-relay lmi-n391dte interface configuration command. To restore the default interval value, assuming an LMI has been configured, use the no form of this command.
frame-relay lmi-n391dte keep-exchanges| keep-exchanges | Number of keep exchanges to be done before requesting a full status message. Acceptable value is a positive integer in the range 1 through 255. |
6 keep exchanges
Interface configuration
Use this command when the interface is configured as data terminal equipment (DTE) or Network-to-Network Interface (NNI) as a means of setting the full status message polling interval.
In the following example, one out of every four status inquiries generated by the router will request a full status response from the switch. The other three status inquiries will request keepalive exchanges only.
interface serial 0 frame-relay intf-type DTE frame-relay lmi-n391dte 4
To set the DCE and the Network-to-Network Interface (NNI) error threshold, use the frame-relay lmi-n392dce interface configuration command. To remove the current setting, use the no form of this command.
frame-relay lmi-n392dce threshold| threshold | Error threshold value. Acceptable value is a positive integer in the range 1 through 10. |
2
Interface configuration
In Cisco's implementation, N392 errors must occur within the number defined by the N393 event count in order for the link to be declared down. Therefore, the threshold value for this command must be less than the count value defined in the frame-relay lmi-n393dce command.
In the following example, the LMI failure threshold is set to three. The router acts as a Frame Relay DCE or NNI switch.
interface serial 0 frame-relay intf-type DCE frame-relay lmi-n392dce 3
frame-relay lmi-n393dce
To set the error threshold on a DTE or NNI interface, use the frame-relay lmi-n392dte interface configuration command. To remove the current setting, use the no form of this command.
frame-relay lmi-n392dte threshold| threshold | Error threshold value. Acceptable value is a positive integer in the range 1 through 10. |
3
Interface configuration
In the following example, the LMI failure threshold is set to three. The router acts as a Frame Relay DTE or NNI switch.
interface serial 0 frame-relay intf-type DTE frame-relay lmi-n392dte 3
To set the DCE and NNI monitored events count, use the frame-relay lmi-n393dce interface configuration command. To remove the current setting, use the no form of this command.
frame-relay lmi-n393dce events| events | Monitored events count value. Acceptable value is a positive integer in the range 1 through 10. |
2
Interface configuration
This command and the frame-relay lmi-n392dce command define the condition that causes the link to be declared down. In Cisco's implementation, N392 errors must occur within the events count in order for the link to be declared down. Therefore, the events value defined in this command must be greater than the threshold value defined in the frame-relay lmi-n392dce command.
In the following example, the LMI monitored events count is set to three. The router acts as a Frame Relay DCE or NNI switch.
interface serial 0 frame-relay intf-type DCE frame-relay lmi-n393dce 3
frame-relay lmi-n392dce
To set the monitored event count on a DTE or NNI interface, use the frame-relay lmi-n393dte interface configuration command. To remove the current setting, use the no form of this command.
frame-relay lmi-n393dte events| events | Monitored events count value. Acceptable value is a positive integer in the range 1 through 10. |
4
Interface configuration
In the following example, the LMI monitored events count is set to three. The router acts as a Frame Relay DTE or NNI switch.
interface serial 0 frame-relay intf-type DTE frame-relay lmi-n393dte 3
To set the polling verification timer on a DCE or NNI interface, use the frame-relay lmi-t392dce interface configuration command. To remove the current setting, use the no form of this command.
frame-relay lmi-t392dce timer| timer | Polling verification timer value (in seconds). Acceptable value is a positive integer in the range 5 through 30. |
15
Interface configuration
The value for the timer must be greater than the DTE or NNI keepalive timer.
The following example indicates a polling verification timer on a DCE or NNI interface set to 20:
interface serial 3 frame-relay intf-type DCE frame-relay lmi-t392dce 20
frame-relay keepalive
To select the Local Management Interface (LMI) type, use the frame-relay lmi-type interface configuration command. To return to the default LMI type, use the no form of this command.
frame-relay lmi-type {ansi | cisco | q933a}| ansi | Annex D defined by ANSI standard T1.617. |
| cisco | LMI type defined jointly by Cisco and three other companies. |
| q933a | ITU-T Q.933 Annex A.1 |
Cisco LMI
Interface configuration
Cisco's implementation of Frame Relay supports three LMI types: Cisco, ANSI Annex D, and
ITU-T Q.933 Annex A.
The LMI type is set on a per-interface basis and is shown in the output of the show interfaces EXEC command.
The following is an example of the commands you enter to select the ANSI Annex D LMI type:
interface Serial1 encapsulation frame-relay frame-relay lmi-type ansi
To set the source DLCI for use when the LMI is not supported, use the frame-relay local-dlci interface configuration command. To remove the DLCI number, use the no form of this command.
frame-relay local-dlci number| number | Local (source) DLCI number to be used. |
No source DLCI is set.
Interface configuration
If LMI is supported and the multicast information element is present, the network server sets its local DLCI based on information provided via the LMI.
The following example specifies 100 as the local DLCI:
interface serial 4 frame-relay local-dlci 100
To define the mapping between a destination protocol address and the DLCI used to connect to the destination address, use the frame-relay map interface configuration command. Use the no form of this command to delete the map entry.
frame-relay map protocol protocol-address dlci [broadcast] [ietf | cisco | payload-compress packet-by-packet] no frame-relay map protocol protocol-addressNo mapping is defined.
Interface configuration
There can be many DLCIs known by a router or access server that can send data to many different places, but they are all multiplexed over one physical link. The Frame Relay map tells the Cisco IOS software how to get from a specific protocol and address pair to the correct DLCI.
The optional ietf and cisco keywords allow flexibility in the configuration. If no keywords are specified in the configuration, the map inherits the attributes set with the encapsulation frame-relay command. You can also use the encapsulation options to specify that, for example, all interfaces use IETF encapsulation except one, which needs the original Cisco encapsulation method, and it can be defined using the cisco keyword with the frame-relay map command.
Payload compression is Cisco-proprietary and will not interoperate with routers of other manufacturers.
You can disable payload compression by entering the no frame-relay map payload command and then entering the frame-relay map command again with one of the other encapsulation keywords: cisco or ietf.
Use the frame-relay map command to enable or disable payload compression on multipoint interfaces. Use the frame-relay payload-compress packet-by-packet command to enable or disable payload compression on point-to-point interfaces.
The broadcast keyword provides two functions: It forwards broadcasts when multicasting is not enabled, and it simplifies the configuration of OSPF for nonbroadcast networks that will use Frame Relay.
The broadcast keyword might also be required for some routing protocols--for example, AppleTalk--that depend on regular routing table updates, especially when the router at the remote end is waiting for a routing update packet to arrive before adding the route.
By requiring selection of a designated router, OSPF treats a nonbroadcast, multiaccess network such as Frame Relay in much the same way as it treats a broadcast network. In previous releases, this required manual assignment in the OSPF configuration using the neighbor interface router command. When the frame-relay map command is included in the configuration with the broadcast, and the ip ospf network command (with the broadcast keyword) is configured, there is no need to configure any neighbors manually. OSPF will now automatically run over the Frame Relay network as a broadcast network. (Refer to the ip ospf network interface command for more detail.)
The following example maps the destination IP address 131.108.123.1 to DLCI 100:
interface serial 0 frame-relay map IP 131.108.123.1 100 broadcast
OSPF will use DLCI 100 to broadcast updates.
frame-relay payload-compress packet-by-packet
Use the frame-relay map bridge interface configuration command to specify that broadcasts should be forwarded when bridging. Use the no form of this command to delete the map entry.
frame-relay map bridge dlci [broadcast] [ietf]No broadcasts are forwarded.
Interface configuration
The following example uses DLCI 144 for bridging:
interface serial 0 frame-relay map bridge 144 broadcast
The following example sets up separate point-to-point links over a subinterface and runs transparent bridging over it:
interface serial 0 bridge-group 1 encapsulation frame-relay interface serial 0.1 bridge-group 1 frame-relay map bridge 42 broadcast interface serial 0.2 bridge-group 1 frame-relay map bridge 64 broadcast interface serial 0.3 bridge-group 1 frame-relay map bridge 73 broadcast
DLCI 42 is used as the link; see the section "Frame Relay Configuration Examples" in the Router Products Configuration Guide for more examples of subinterfaces.
Use the frame-relay map clns interface configuration command to specify that broadcasts should be forwarded when routing using ISO CLNS. Use the no form of this interface configuration command to delete the map entry.
frame-relay map clns dlci [broadcast]| dlci | DLCI number to which CLNS broadcasts should be forwarded on the specified interface. |
| broadcast | (Optional) Broadcasts should be forwarded when multicast is not enabled. |
No broadcasts are forwarded.
Interface configuration
The following example uses DLCI 125 for ISO CLNS routing:
interface serial 0 frame-relay map clns 125 broadcast
To assign header compression characteristics to an IP map that differ from the compression characteristics of the interface with which the IP map is associated, use the frame-relay map ip tcp header-compression interface configuration command. To remove the IP map, use the no form of this command.
frame-relay map ip ip-address dlci [broadcast] [cisco | ietf] [nocompress]The default encapsulation is cisco.
Interface configuration
To disable TCP/IP header compression on the IP map, use the nocompress form of the command.
IP maps inherit the compression characteristics of the associated interface unless this command is used to provide different characteristics. This command can also be used to reconfigure an IP map that existed before TCP header compression was configured on the associated interface.
When IP maps at both ends of a connection inherit passive compression, the connection will never transfer compressed traffic because neither side will generate a packet with a compressed header.
If you change the encapsulation characteristics of the interface to IETF, you lose the TCP header compression configuration of the associated IP map.
The command frame-relay map ip ip-address dlci tcp header-compression active can also be entered as frame-relay map ip ip-address dlci active tcp header-compression.
The following example illustrates a command sequence configuring an IP map associated with serial interface 1 to enable active TCP header compression:
interface serial 1 encapsulation frame-relay ip address 131.108.177.170 255.255.255.0 frame-relay map ip 131.108.177.180 190 cisco tcp header-compression active
frame-relay ip tcp header-compression
Use the frame-relay multicast-dlci interface configuration command to define the DLCI to be used for multicasts. Use the no form of this command to remove the multicast group.
frame-relay multicast-dlci number| number | Multicast DLCI. |
No DLCI is defined.
Interface configuration
Use this command when the multicast facility is not supported. Network transmissions (packets) sent to a multicast DLCI are delivered to all network servers defined as members of the multicast group.
The following example specifies 1022 as the multicast DLCI:
interface serial 0 frame-relay multicast-dlci 1022
To enable the stac payload compression on a specified point-to-point interface or subinterface, use the frame-relay payload-compress packet-by-packet interface configuration command. To disable payload compression on a specified point-to-point interface or subinterface, use the no form of this command.
frame-relay payload-compress packet-by-packetThis command has no keywords and arguments.
Disabled
Interface configuration
Use the frame-relay payload-compress packet-by-packet command to enable or disable payload compression on a point-to-point interface or subinterface. Use the frame-relay map command to enable or disable payload compression on a multipoint interface or subinterface.
To enable multiple parallel DLCIs for different types of Frame Relay traffic, associate specified DLCIs with the same group, and define their levels, use the frame-relay priority-dlci-group subinterface configuration command.
frame-relay priority-dlci-group group-number high-dlci medium-dlci normal-dlci low-dlci| group-number | Specific group number. |
| high-dlci | DLCI that is to have high level. |
| medium-dlci | DLCI that is to have medium level. |
| normal-dlci | DLCI that is to have normal level. |
| low-dlci | DLCI that is to have lowest level. |
Disabled
Interface configuration
This command applies at the subinterface level.
Levels in descending order are high, medium, normal, and low.
This command defines different DLCIs for different categories of traffic. It does not itself define priority queueing but can be used in association with it.
A global priority list must be defined before this command is used. In addition, the DLCIs mentioned in this command must be defined before this command is used.
If you do not explicitly specify a DLCI for each of the levels, the last DLCI specified in the command line is used as the value of the remaining arguments. For example, the following two commands are equivalent:
frame-relay priority-dlci-group 1 40 50 frame-relay priority-dlci-group 1 40 50 50 50
When you configure frame-relay map commands or use Inverse ARP, the high level DLCI is the only one that is mapped. If you had entered one of the commands above, you would configure DLCI 40, but not DLCI 50, in a frame-relay map command.
A dagger (+) indicates that the command is documented in another chapter.
frame-relay map
priority-list +
Use the frame-relay route interface configuration command to specify the static route for PVC switching. Use the no form of this command to remove a static route.
frame-relay route in-dlci out-interface out-dlci| in-dlci | DLCI on which the packet is received on the interface. |
| out-interface | Interface the router uses to transmit the packet. |
| out-dlci | DLCI the router uses to transmit the packet over the specified out-interface. |
No static route is specified.
Interface configuration
The following example configures a static route that allows packets in DLCI 100 and transmits packets out over DLCI 200 on interface serial 2:
frame-relay route 100 interface Serial2 200
The following example illustrates the commands you enter for a complete configuration that includes two static routes for PVC switching between interface serial 1 and interface serial 2:
interface Serial1 no ip address encapsulation frame-relay keepalive 15 frame-relay lmi-type ansi frame-relay intf-type dce frame-relay route 100 interface Serial2 200 frame-relay route 101 interface Serial2 201 clockrate 2000000
To instruct the network server to request the short status message from the switch (see Version 2.3 of the joint Frame Relay Interface specification), use the frame-relay short-status interface configuration command. Use the no form of this command to override the default.
frame-relay short-statusThese commands have no keywords or arguments.
To request the full status message
Interface command
The following example returns the interface to the default state of requesting full status messages.
interface serial 0 no frame-relay short-status
Use the frame-relay switching global configuration command to enable PVC switching on a Frame Relay DCE or an NNI. Use the no form of this command to disable switching.
frame-relay switchingThis command has no arguments or keywords.
Disabled
Global configuration
This command must be added to the configuration file before configuring the routes.
The following example shows the simple command that is entered in the configuration file before the Frame Relay configuration commands to enable switching:
frame-relay switching
To display statistics and TCP/IP header compression information for the interface, use the show frame-relay ip tcp header-compression EXEC command.
show frame-relay ip tcp header-compressionThis command has no arguments or keywords.
EXEC
The following is sample output from the show frame-relay ip tcp header-compression command:
DLCI 200 Link/Destination info: ip 131.108.177.200
Interface Serial0:
Rcvd: 40 total, 36 compressed, 0 errors
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 0 total, 0 compressed
0 bytes saved, 0 bytes sent
Connect: 16 rx slots, 16 tx slots, 0 long searches, 0 misses, 0% hit ratio
Five minute miss rate 0 misses/sec, 0 max misses/sec
Table 9-2 describes the fields shown in the display.
| Field | Description |
|---|---|
| Rcvd | |
| total | Sum of compressed and uncompressed packets received. |
| compressed | Number of compressed packets received. |
| errors | Number of errors caused by errors in the header fields (version, total length, or IP checksum). |
| dropped | Number of packets discarded. Seen only after line errors. |
| buffer copies | Number of times that a new buffer was needed to put the uncompressed packet in. |
| buffer failures | Number of times that a new buffer was needed but was not obtained. |
| Sent | |
| total | Sum of compressed and uncompressed packets sent. |
| compressed | Number of compressed packets sent. |
| bytes saved | Number of bytes reduced because of the compression. |
| bytes sent | Actual number of bytes transmitted. |
| Connect | |
| rx slots, tx slots | Number of states allowed over one TCP connection. A state is recognized by a source address, a destination address, and an IP header length. |
| long searches | Number of times that the connection ID in the incoming packet was not the same as the previous one that was processed. |
| misses | Number of times that a matching entry was not found within the connection table and a new entry had to be entered. |
| hit ratio | Percentage of times that a matching entry was found in the compression tables and the header was compressed. |
| Five minute miss rate | Miss rate computed over the most recent 5 minutes and the maximum per-second miss rate during that period. |
Use the show frame-relay lmi EXEC command to display statistics about the Local Management Interface (LMI).
show frame-relay lmi [type number]| type | (Optional) Interface type; serial only. |
| number | (Optional) Interface number. |
EXEC
Enter the command without arguments to obtain statistics about all Frame Relay interfaces.
The following is sample output from the show frame-relay lmi command when the interface is a DTE:
Router# show frame-relay lmi
LMI Statistics for interface Serial1 (Frame Relay DTE) LMI TYPE = ANSI
Invalid Unnumbered info 0 Invalid Prot Disc 0
Invalid dummy Call Ref 0 Invalid Msg Type 0
Invalid Status Message 0 Invalid Lock Shift 0
Invalid Information ID 0 Invalid Report IE Len 0
Invalid Report Request 0 Invalid Keep IE Len 0
Num Status Enq. Sent 9 Num Status msgs Rcvd 0
Num Update Status Rcvd 0 Num Status Timeouts 9
The following is sample output from the show frame-relay lmi command when the interface is an NNI:
Router# show frame-relay lmi
LMI Statistics for interface Serial3 (Frame Relay NNI) LMI TYPE = CISCO
Invalid Unnumbered info 0 Invalid Prot Disc 0
Invalid dummy Call Ref 0 Invalid Msg Type 0
Invalid Status Message 0 Invalid Lock Shift 0
Invalid Information ID 0 Invalid Report IE Len 0
Invalid Report Request 0 Invalid Keep IE Len 0
Num Status Enq. Rcvd 11 Num Status msgs Sent 11
Num Update Status Rcvd 0 Num St Enq. Timeouts 0
Num Status Enq. Sent 10 Num Status msgs Rcvd 10
Num Update Status Sent 0 Num Status Timeouts 0
Table 9-3 describes significant fields shown in the output.
| Field | Description |
|---|---|
| LMI TYPE = | Signaling or LMI specification: CISCO, ANSI, or ITU-T. |
| Invalid Unnumbered info | Number of received LMI messages with invalid unnumbered information field. |
| Invalid Prot Disc | Number of received LMI messages with invalid protocol discriminator. |
| Invalid dummy Call Ref | Number of received LMI messages with invalid dummy call references. |
| Invalid Msg Type | Number of received LMI messages with invalid message type. |
| Invalid Status Message | Number of received LMI messages with invalid status message. |
| Invalid Lock Shift | Number of received LMI messages with invalid lock shift type. |
| Invalid Information ID | Number of received LMI messages with invalid information identifier. |
| Invalid Report IE Len | Number of received LMI messages with invalid Report IE Length. |
| Invalid Report Request | Number of received LMI messages with invalid Report Request. |
| Invalid Keep IE Len | Number of received LMI messages with invalid Keep IE Length. |
| Num Status Enq. Rcvd | Number of LMI status inquiry messages received. |
| Num Status msgs Sent | Number of LMI status messages sent. |
| Num Status Update Sent | Number of LMI update status messages sent. |
| Num Status Enq. Sent | Number of LMI status inquiry messages sent. |
| Num Status msgs Received | Number of LMI status messages received. |
| Num Status Update Rcvd | Number of LMI update status messages received. |
| Num Status Timeouts | Number of times the status message was not received within the keepalive timer. |
| Num Status Enq. Timeouts | Number of times the status enquiry message was not received within the T392 DCE timer. |
To display the current map entries and information about the connections, use the show frame-relay map EXEC command.
show frame-relay mapThis command has no arguments or keywords.
EXEC
The following is sample output from the show frame-relay map command:
Router# show frame-relay map
Serial 1 (administratively down): ip 131.108.177.177
dlci 177 (0xB1,0x2C10), static,
broadcast,
CISCO
TCP/IP Header Compression (inherited), passive (inherited)
Table 9-4 describes significant fields shown in the display.
| Field | Description |
|---|---|
| Serial 1 (administratively down) | Identifies a Frame Relay interface and its status (up or down). |
| ip 131.108.177.177 | Destination IP address. |
| dlci 177 (0xB1,0x2C10) | DLCI that identifies the logical connection being used to reach this interface. This value is displayed in three ways: its decimal value (177), its hexadecimal value (0xB1), and its value as it would appear on the wire (0x2C10). |
| static | Indicates whether this is a static or dynamic entry. |
| CISCO | Indicates the encapsulation type for this map; either CISCO or IETF. |
| TCP/IP Header Compression (inherited), passive (inherited) | Indicates whether the TCP header compression characteristics were inherited from the interface or were explicitly configured for the IP map. |
show frame-relay pvc
To display statistics about PVCs for Frame Relay interfaces, use the show frame-relay pvc EXEC command.
show frame-relay pvc [type number [dlci]]| type | (Optional) Interface type. |
| number | (Optional) Interface number. |
| dlci | (Optional) One of the specific DLCI numbers used on the interface. Statistics for the specified PVC display when a DLCI is also specified. |
EXEC
To obtain statistics about PVCs on all Frame Relay interfaces, use this command with no arguments.
When the interface is configured as a DCE and the DLCI usage is SWITCHED, the value displayed in the PVC STATUS field is determined by the status of outgoing interfaces (up or down) and status of the outgoing PVC. The status of the outgoing PVC is updated in the local management interface (LMI) message exchange. PVCs terminated on a DCE interface use the status of the interface to set the PVC STATUS.
If the outgoing interface is a tunnel, the PVC status is determined by what is learned from the tunnel.
If an LMI status report indicates that a PVC is not active, then it is marked as inactive. A PVC is marked as deleted if it is not listed in a periodic LMI status message.
In the case of a hybrid DTE switch, the PVC status on the DTE side is determined by the PVC status reported by the external Frame Relay network through the LMI.
Congestion control mechanisms are currently not supported, but the switch passes Forward Explicit Congestion Notification (FECN) bits, backward explicit congestion notification (BECN) bits, and discard eligibility (DE) bits unchanged from ingress to egress points in the network.
The following is sample output from the show frame-relay pvc command:
Router# show frame-relay pvc
PVC Statistics for interface Serial1 (Frame Relay DCE)
DLCI = 100, DLCI USAGE = SWITCHED, PVC STATUS = ACTIVE
input pkts 0 output pkts 0 in bytes 0
out bytes 0 dropped pkts 0 in FECN pkts 0
in BECN pkts 0 out FECN pkts 0 out BECN pkts 0
in DE pkts 0 out DE pkts 0
pvc create time 0:03:03 last time pvc status changed 0:03:03
Num Pkts Switched 0
DLCI = 101, DLCI USAGE = SWITCHED, PVC STATUS = INACTIVE
input pkts 0 output pkts 0 in bytes 0
out bytes 0 dropped pkts 0 in FECN pkts 0
in BECN pkts 0 out FECN pkts 0 out BECN pkts 0
in DE pkts 0 out DE pkts 0
pvc create time 0:02:58 last time pvc status changed 0:02:58
Num Pkts Switched 0
DLCI = 102, DLCI USAGE = SWITCHED, PVC STATUS = DELETED
input pkts 0 output pkts 0 in bytes 0
out bytes 0 dropped pkts 0 in FECN pkts 0
in BECN pkts 0 out FECN pkts 0 out BECN pkts 0
in DE pkts 0 out DE pkts 0
pvc create time 0:02:58 last time pvc status changed 0:02:58
Num Pkts Switched 0
The following is sample output from the show frame-relay pvc command for multipoint subinterfaces. The output displays both the subinterface number and the DLCI. This display is the same whether the PVC is configured for static or dynamic addressing.
DLCI = 300, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0.103 > > input pkts 10 output pkts 7 in bytes 6222 > out bytes 6034 dropped pkts 0 in FECN pkts 0 > in BECN pkts 0 out FECN pkts 0 out BECN pkts 0 > in DE pkts 0 out DE pkts 0 > pvc create time 0:13:11 last time pvc status changed 0:11:46 > >DLCI = 400, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0.104 > > input pkts 20 output pkts 8 in bytes 5624 > out bytes 5222 dropped pkts 0 in FECN pkts 0 > in BECN pkts 0 out FECN pkts 0 out BECN pkts 0 > in DE pkts 0 out DE pkts 0 > pvc create time 0:03:57 last time pvc status changed 0:03:48
Table 9-5 describes the fields shown in the displays.
| Field | Description |
|---|---|
| DLCI | One of the Data Link Connection Identifier (DLCI) numbers for the PVC. |
| DLCI USAGE | Lists SWITCHED when the router is used as a switch, or LOCAL when the router is used as a DTE. |
| PVC STATUS | Status of the PVC: ACTIVE, INACTIVE, or DELETED. |
| INTERFACE = Serial0.103 | Specific subinterface associated with this DLCI. |
| input pkts | Number of packets received on this PVC. |
| output pkts | Number of packets sent on this PVC. |
| in bytes | Number of bytes received. |
| out bytes | Number of bytes sent. |
| dropped pkts | Number of packets dropped by the router. |
| in FECN pkts | Number of packets received with the FECN bit set. |
| in BECN pkts | Number of packets received with the BECN bit set. |
| out FECN pkts | Number of packets sent with the FECN bit set. |
| out BECN pkts | Number of packets sent with the BECN bit set. |
| in DE pkts | Number of DE packets received. |
| out DE pkts | Number of DE packets sent. |
| pvc create time | Time the PVC was created. |
| last time pvc status changed | Time the PVC changed status (active to inactive). |
| Num Pkts Switched | Number of packets switched within the router; this PVC is the source PVC. |
Use the show frame-relay route EXEC command to display all configured Frame Relay routes, along with their status.
show frame-relay routeThis command has no arguments or keywords.
EXEC
The following is sample output from the show frame-relay route command:
Router# show frame-relay route
Input Intf Input Dlci Output Intf Output Dlci Status
Serial1 100 Serial2 200 active
Serial1 101 Serial2 201 active
Serial1 102 Serial2 202 active
Serial1 103 Serial3 203 inactive
Serial2 200 Serial1 100 active
Serial2 201 Serial1 101 active
Serial2 202 Serial1 102 active
Serial3 203 Serial1 103 inactive
Table 9-6 describes significant fields shown in the output.
| Field | Description |
|---|---|
| Input Intf | Input interface and unit. |
| Input Dlci | Input DLCI number. |
| Output Intf | Output interface and unit. |
| Output Dlci | Output DLCI number. |
| Status | Status of the connection: active or inactive. |
Use the show frame-relay traffic EXEC command to display the router's global Frame Relay statistics since the last reload.
show frame-relay trafficThis command has no arguments or keywords.
EXEC
The following is sample output from the show frame-relay traffic command:
Router# show frame-relay traffic
Frame Relay statistics:
ARP requests sent 14, ARP replies sent 0
ARP request recvd 0, ARP replies recvd 10
Information shown in the display is self-explanatory.
Use the show interfaces serial EXEC command to display information about a serial interface. When using the Frame Relay encapsulation, use the show interfaces serial command to display information about the multicast DLCI, the DLCIs used on the interface, and the LMI DLCI used for the Local Management Interface.
show interfaces serial number| number | Interface number. |
EXEC
The multicast DLCI and the local DLCI can be set using the frame-relay multicast-dlci and the frame-relay local-dlci commands, or provided through the Local Management Interface. The status information is taken from the LMI, when active.
The following is sample output from the show interfaces serial command for a serial interface with the CISCO LMI enabled:
Router# show interface serial 1
Serial1 is up, line protocol is down
Hardware is MCI Serial
Internet address is 131.108.174.48, subnet mask is 255.255.255.0
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 246/255, load 1/255
Encapsulation FRAME-RELAY, loopback not set, keepalive set (10 sec)
LMI enq sent 2, LMI stat recvd 0, LMI upd recvd 0, DTE LMI down
LMI enq recvd 266, LMI stat sent 264, LMI upd sent 0
LMI DLCI 1023 LMI type is CISCO frame relay DTE
Last input 0:00:04, output 0:00:02, output hang never
Last clearing of "show interface" counters 0:44:32
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
Five minute input rate 0 bits/sec, 0 packets/sec
Five minute output rate 0 bits/sec, 0 packets/sec
307 packets input, 6615 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 input packets with dribble condition detected
266 packets output, 3810 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets, 0 restarts
178 carrier transitions
The display shows the statistics for the LMI as the number of status inquiry messages sent (LMI sent), the number of status messages received (LMI recvd), and the number of status updates received (upd recvd). See the Frame Relay Interface specification for additional explanations of this output.
The following is sample output from the show interfaces serial command for a serial interface with the ANSI LMI enabled:
Router# show interface serial 1
Serial1 is up, line protocol is down
Hardware is MCI Serial
Internet address is 131.108.174.48, subnet mask is 255.255.255.0
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 249/255, load 1/255
Encapsulation FRAME-RELAY, loopback not set, keepalive set (10 sec)
LMI enq sent 4, LMI stat recvd 0, LMI upd recvd 0, DTE LMI down
LMI enq recvd 268, LMI stat sent 264, LMI upd sent 0
LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE
Last input 0:00:09, output 0:00:07, output hang never
Last clearing of "show interface" counters 0:44:57
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
Five minute input rate 0 bits/sec, 0 packets/sec
Five minute output rate 0 bits/sec, 0 packets/sec
309 packets input, 6641 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 input packets with dribble condition detected
268 packets output, 3836 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets, 0 restarts
180 carrier transitions
Each display provides statistics and information about the type of LMI configured, either CISCO for the Cisco LMI type, ANSI for the ANSI T1.617 Annex D LMI type, or ITU-T for the ITU-T Q.933 Annex A LMI type. See the description for the show interfaces command for a description of the other fields displayed by this command.
A dagger (+) indicates that the command is documented in another chapter.
show interfaces+
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