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Use the commands described in this chapter to configure Frame Relay. Frame Relay was conceived as a protocol for use over serial interfaces and was designed for those networks with large T1 installations.
For Frame Relay configuration information and examples, refer to the "Configuring Frame Relay" chapter in the Access and Communication Servers Configuration Guide.
To clear dynamically created Frame Relay maps, which are created by the use of Inverse Address Resolution Protocol (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
Use the encapsulation frame-relay interface configuration command to enable Frame Relay encapsulation. The no form of the command to disable Frame Relay.
encapsulation frame-relay [cisco | ietf]Enabled
Interface configuration
If the optional keyword is omitted, the access server uses Cisco's own encryption, which is a 4-byte header with 2 bytes for the DLCI and 2 bytes to identify the packet type.
The following example configures Cisco Frame Relay encapsulation on serial interface 1:
interface serial 1 encapsulation frame-relay
Use the ietf keyword if your access server is connected to another vendor's equipment across a Frame Relay network to conform with RFCs 1294 and 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 be held 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 not including 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 upon 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 dlci 170
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 | type number} characteristic| list-number | Number of the DE list |
| protocol | Protocol keyword. |
| protocol | One of the following keywords corresponding to a supported protocol or device: arp--Address Resolution Protocol appletalk--AppleTalk clns--ISO Connectionless Network Service clns_es--CLNS end systems compressedtcp--Compressed TCP ip--Internet Protocol ipx--Novell Internet Packet Exchange |
| type number | Any valid interface type and unit number, such as serial 0. |
| characteristic | You must supply 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 DE bit set:
frame-relay de-list ip gt 512
To assign a DLCI to a specified Frame Relay subinterface on the access server, 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 | DLCI number to be used on the specified subinterface. |
| option | (Optional) Broadcast or encapsulation keyword, as defined in the "Frame Relay Interface-DLCI Option Keywords" table. |
| protocol ip ip-address | Indicates the IP address of the serial interface of a new access server onto which an access server configuration file is to be autoinstalled over a Frame Relay network. See the "Usage Guidelines" section for information about when to use this option. |
No DLCI is assigned.
Interface configuration
Use this command only for subinterfaces on an access server. Use of the command on an interface, rather than a subinterface, will prevent the access server from forwarding packets intended for that DLCI.
Subinterfaces are logical interfaces associated with a physical interface. To use this command, you must be in subinterface configuration mode. This requires making the logical subinterface assignment before assigning any DLCIs and any encapsulation or broadcast options. See the following example.
Use the protocol ip ip-address option only when this access server will act as the BOOTP server for autoinstallation over Frame Relay.
Table 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 subinterface serial 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 the command to disable the switch.
frame-relay intf-type [dce | dte | nni]dte
Interface configuration
The following example configures a DTE switch type:
interface serial 2 frame-relay intf-type dte
Use the frame-relay inverse-arp interface configuration command to enable the Inverse Address Resolution Protocol (Inverse ARP) on the access server configured for Frame Relay. Use the no form of the command to disable this feature.
frame-relay inverse-arp protocol dlci| protocol | Supported protocols: appletalk, ip, ipx, and vines. |
| dlci | DLCI number for the interface. Acceptable numbers are integers in the range 16 to 1007. |
Enabled
Interface configuration
This implementation of Inverse ARP is based on RFC 1293. It allows a access server 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 flags dynamically created virtual circuits created by Inverse ARP with the word dynamic.
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) Compress the outgoing TCP/IP packet header only if the incoming packet has 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.
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 will inherit the compression characteristics of the interface, unless header compression is explicitly rejected or modified by using the frame-relay map ip header compression command.
The following example configures interface serial 1 to use IETF encapsulation and passive TCP header compression:
interface serial 1 encapsulation frame-relay frame-relay ip tcp header-compression passive
frame-relay 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 the command to disable this capability.
frame-relay keepalive seconds| seconds | An integer that defines the keepalive interval in seconds. 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 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 2 or 3 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
Use the frame-relay lmi-n391dte interface configuration command to set a full status polling interval. Use the no form of the command to restore the default interval value, assuming an LMI has been configured.
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 access server 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
Use the frame-relay lmi-n392dce interface configuration command to set the data communications equipment (DCE) and NNI error threshold. Use the no frame-relay lmi-n392dce command to remove the current setting.
frame-relay lmi-n392dce threshold| threshold | Error threshold value. Acceptable value is a positive integer in the range 1 through 10. |
2 errors
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 3. The access server acts as a Frame Relay DCE or NNI switch.
interface serial 0 frame-relay intf-type dce frame-relay lmi-n392dce 3
Use the frame-relay lmi-n392dte interface configuration command to set the error threshold on a DTE or NNI interface. Use the noform of the command to remove the current setting.
frame-relay lmi-n392dte threshold| threshold | Error threshold value. Acceptable value is a positive integer in the range 1 through 10. |
2 errors
Interface configuration
In the following example, the LMI failure threshold is set to 3. The access server acts as a Frame Relay DTE or NNI switch.
interface serial 0 frame-relay intf-type dte frame-relay lmi-n392dte 3
Use the frame-relay lmi-n393dce interface configuration command to set the DCE and NNI monitored events count. Use the no form of the command to remove the current setting.
frame-relay lmi-n393dce events| events | Monitored events count value. Acceptable value is a positive integer in the range 1 through 10. |
2 events
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 3. The access server acts as a Frame Relay DCE or NNI switch.
interface serial 0 frame-relay intf-type dce frame-relay lmi-n393dce 3
Use the frame-relay lmi-n393dte interface configuration command to set the monitored event count on a DTE or NNI interface. Use the no form of the command to remove the current setting.
frame-relay lmi-n393dte events| events | Monitored event count value. Acceptable value is a positive integer in the range 1 through 10. |
2 events
Interface configuration
In the following example, the LMI monitored events count is set to 3. The access server acts as a Frame Relay DTE or NNI switch.
interface serial 0 frame-relay intf-type dte frame-relay lmi-n393dte 3
Use the frame-relay lmi-t392dce interface configuration command to set the polling verification timer on a DCE or NNI interface. Use the no form of the command to remove the current setting.
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 seconds
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 seconds:
interface serial 3 frame-relay intf-type dce frame-relay lmi-t392dce 20
Use the frame-relay lmi-type interface configuration command to select the Local Management Interface (LMI) type. Use the no form of the command to return to the default LMI type.
frame-relay lmi-type {ansi | cisco | q933a}| ansi | Annex D defined by ANSI standard T1.617 |
| cisco | Group of 4 LMI |
| q933a | ITU-T1 Q.933 Annex A |
Cisco LMI
Interface configuration
Cisco's implementation of Frame Relay supports three LMI types: Cisco, ANSI Annex D, and
ITU-T.
The no form of the command is included to maintain backwards compatibility. If the LMI type is changed from ANSI or ITU-T, the LMI type reverts to the Cisco type.
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 serial 1 encapsulation frame-relay frame-relay lmi-type ansi
Use the frame-relay local-dlci interface configuration command to set the source DLCI for use when the LMI is not supported. Use the no form of the command to remove the DLCI number.
frame-relay local-dlci number| number | Local (source) DLCI number for the interface |
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
To assign header-compression characteristic to an IP map that differs 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 the command. To disable TCP/IP header compression on the IP map, use the nocompress form of the command.
frame-relay map ip ip-address dlci [broadcast] [cisco | ietf] [nocompress]The default encapsulation keyword is cisco.
Interface configuration
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 configure 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 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 interface serial 1 to enable active TCP header compression.
interface serial 1 encapsulation frame-relay ip address172.30.177.170 255.255/255/0 frame-relay map ip172.30.177.170 190 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 the command to remove the multicast group.
frame-relay multicast-dlci number| number | Multicast DLCI. (Note that this is not the multicast group number, which is an entirely different value.) |
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 stack 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.
frame-relay map
To enable DLCI-based Frame Relay priority levels and define the priority level of specified DLCIs, 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 priority. |
| medium-DLCI | DLCI that is to have medium priority. |
| normal-DLCI | DLCI that is to have normal priority. |
| low-DLCI | DLCI that is to have lowest priority. |
Disabled
Interface configuration
This command applies at the subinterface level.
Priority levels in descending order are high, medium, normal, and low.
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 priority 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 priority 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.
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 the 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 access server uses to transmit the packet |
| out-dlci | DLCI the access server 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 serial interface 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 serial interface 1 and serial interface 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 subcommand. Use the no form of the command to override the default
frame-relay short-statusThese commands have no keywords or arguments.
To request the full status message
Interface subcommand
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 the command to disable switching.
frame-relay switchingThis command has no arguments or keywords.
Global configuration
Disabled
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
Use the show frame-relay lmi EXEC command to display statistics about the Local Management Interface (LMI).
show frame-relay lmi [interface]| interface | (Optional) LMI statistics for only the specified interface |
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 9-1 describes significant fields shown in the displays.
| 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 statistics and tcp 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 map EXEC command to display the current Frame Relay map entries and information about these connections.
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 mapSerial 1 (administratively down): ip172.30.177.177 dlci 177 (oxB1,0x2C10), static, broadcast, CISCO TCP/IP Header Compression (inherited), passive (inherited)
Table 9-3 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 172.30.177.177: | 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 or not 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. |
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) DLCI number for 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 pure DCE, the PVC status is determined by the status of incoming and outgoing interfaces and line status. If the outgoing interface is a tunnel, the final PVC status is determined by what is learned from the tunnel.
If the remote Frame Relay interface goes down, the status is reflected in the LMI over the tunnel. If the tunnel goes down, it is reflected by its line protocol when it does not have a route to the other end of the tunnel.
In the case of a hybrid DTE switch, the PVC status on the DTE side is determined by the PVC status learned from the external Frame Relay network.
Congestion control mechanisms are currently not supported, but the switch will pass FECN, BECN, and 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
Table 9-4 describes the fields shown in the display.
| Field | Description |
|---|---|
| DLCI | DLCI number for the interface. |
| DLCI USAGE | Lists SWITCHED when the access server is used as a switch, or LOCAL when the access server is used as a DTE. |
| PVC STATUS | Status of the PVC: ACTIVE, INACTIVE, or DELETED. |
| input pkts | Number of input packets. |
| output pkts | Number of output packets. |
| in bytes | Number of incoming bytes. |
| out bytes | Number of outgoing bytes. |
| dropped pkts | Number of dropped packets. |
| in FECN pkts | Number of incoming FECN packets. |
| out FECN pkts | Number of outgoing FECN packets. |
| in BECN pkts | Number of incoming BECN packets. |
| out BECN pkts | Number of outgoing BECN packets. |
| in DE pkts | Number of incoming DE packets. |
| out DE pkts | Number of outgoing DE packets. |
| 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 switched packets seen. |
Enter the show frame-relay route EXEC command at the system prompt 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 9-5 describes significant fields shown in the display.
| 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 access server'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 on the multicast DLCI, the DLCI of the interface, and the LMI DLCI used for the Local Management Interface.
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.
show interfaces serial number| number | Interface number. |
EXEC
The following is sample output from the show interfaces serial command for a serial interface with the CISCO LMI enabled:
router#show interfaces serial 1Serial1 is up, line protocol is down Hardware is MCI Serial Internet address is172.30.174.48, 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 command for a serial interface with the ANSI LMI enabled:
router#show interfaces serial 1Serial1 is up, line protocol is down Hardware is MCI Serial Internet address is172.30.174.48, 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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