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This chapter describes the commands to configure data link switching plus (DLSw+), our implementation of the DLSw standard. For DLSw+ configuration tasks and examples, refer to the "Configuring DLSw+" chapter of the Router Products Configuration Guide. For specific SDLC commands to configure DLSw+ for SDLC, refer to the "LLC2 and SDLC Commands" chapter of the Router Products Command Reference publication.
Use the dlsw bgroup-list global configuration command to map traffic on the local Ethernet bridge group interface to remote peers.
dlsw bgroup-list list-number bgroups number| list-number | The ring list number. This number is subsequently used in the dlsw remote-peer command to define the segment to which the bridge-group belongs |
| bgroups | The transparent bridge group to which DLSw+ will be attached. The valid range is 1 through 63. |
| number | The transparent bridge group list number. The valid range is 1 through 255. |
There is no default setting.
Global configuration
Traffic received from a remote peer is forwarded only to the bridge group specified in the bridge group list. Traffic received from a local interface is forwarded to peers if the input bridge group number appears in the bridge group list applied to the remote peer definition. The definition of a bridge group list is optional. Since each remote peer has a single list-number associated with it, if you want traffic to go to a bridge group and to either a ring list or port list, you should specify the same list number in each definition
The following example configures bgroup list 1:
dlsw bgroup-list 1 bgroups 33
dlsw bridge-group
dlsw port-list
dlsw ring-list
Use the dlsw bridge-group global configuration command to link DLSw+ to the bridge group of the Ethernet LANs. Use the no form of this command to disable the link.
dlsw bridge-group group-number| group-number | The transparent bridge group to which DLSw+ will be attached. The valid range is 1 through 63. |
There is no default setting.
Global configuration
The following example links DLSw+ to bridge-group 1:
dlsw bridge-group 1
Use the dlsw disable global configuration command to disable and reenable DLSw+ without altering the configuration.
dlsw disableThis command has no arguments or keywords.
There is no default setting.
Global configuration
The following example disables and reenables DLSw+:
dlsw disable
Use the dlsw duplicate-path-bias global configuration command to specify how DLSw+ handles duplicate paths to the same MAC address or NetBIOS name. Use the no form of the command to return to the default (fault-tolerance).
dlsw duplicate-path-bias [load-balance]| load-balance | (Optional) Specifies that sessions are load-balanced across duplicate paths. |
Fault-tolerance is the default logic used to handle duplicate paths.
Global configuration
A path is either a remote peer or a local port.
In full-tolerance mode, the preferred path is always used unless it is unavailable. The preferred path is either the path over which the first response to an explorer was received, or, in the case of remote peers, the peer with the least cost.
The following example specifies load balancing to resolve duplicate paths.
dlsw duplicate-path-bias load balance
Use the dlsw explorerq-depth global configuration command to configure the depth of the DLSw explorer packet processing queue. Use the no form of this command to disable the explorer packet processing queue.
dlsw explorerq-depth queue-max| queue-max | Maximum queue size in packets. The valid range is 25 through 500 packets. |
No default queue-max is configured.
Global configuration
The following example sets the explorer packet processing queue to 256:
dlsw explorerq-depth 256
Use the dlsw icannotreach saps global configuration command to configure a list of SAPs not locally reachable by the router. Use the no form of this command to remove the list.
dlsw icannotreach saps sap [sap...]| sap sap... | Array of SAPs. |
No lists are configured.
Global configuration
This command first appeared in Cisco IOS Release 10.3
The dlsw icannot reach saps command causes the local router to send a control vector to its peers during the capabilities exchange, which tells the peers not to send canureach messages to the local router for sessions using those DSAPs. (They are DSAPs from the peer's perspective, and SSAPs from the perspective of the devices attached to the local router.) The effect is that devices attached to the peer will not be able to initiate sessions to devices attached to the local router using the listed DSAPs. Devices attached to the local router, however, will still be able to start sessions with devices on its peers using the listed saps as SSAPs. The reason is that the local router can still send canureach requests to its peers, since no filtering is actually done on the local router. The filtering done by the peers does not prohibit the peers from responding to canureach requests from the local router sending the control vector, only sending canureach requests to the local router.
The following example specifies a list of SAPs that are not reachable:
dlsw icannotreach saps F0
Use the dlsw icanreach global configuration command to configure a resource that is locally reachable by this router. Use the no form of this command to remove the resource.
dlsw icanreach {mac-exclusive | netbios-exclusive | mac-address mac-addr [mask mask] || mac-exclusive | Router can reach only the MAC addresses that are user configured. |
| netbios-exclusive | Router can reach only the NetBIOS names that are user configured. |
| mac-address mac-addr | Configure a MAC address that this router can locally reach. |
| mask mask | (Optional) MAC address mask in hexadecimal h.h.h. The mask indicates which bits in the MAC address are relevant. |
| netbios-name name | Configure a NetBIOS name that this router can locally reach. Wildcards are allowed. The wildcard is either an asterisk (*) at the end, or a question mark (?) in the middle of the name. |
No resources are configured.
Global configuration
This command can be entered at any time. It causes a capabilities exchange to relay the information to all active peers. By specifying resource names or MAC addresses in this command, you can avoid broadcasts from remote peers that are looking for this resource. By specifying "exclusive" you can avoid broadcasts to this router for any resources. For example, you could configure the FEP MAC address or corporate site LAN servers in central site routers to avoid any broadcasts over the WAN for these resources.
The following example indicates that this peer only has information about a single NetBIOS server, and that no peers should send this peer explorers searching for other NetBIOS names:
dlsw icanreach netbios-exclusive
dlsw icanreach netbios-name lanserv
show dlsw capabilities
show dlsw peers
Use the dlsw local-peer global configuration command to define the parameters of the DLSw+ local peer. Use the no form of this command to cancel the definitions.
dlsw local-peer [peer-id ip-address] [group group] [border] [cost cost]| peer-id ip-address | (Optional) Local peer IP address; required for FST and TCP. |
| group group | (Optional) Peer group number for this router. The valid range is 1 through 255. |
| border | (Optional) Enables as a border peer. |
| cost cost | (Optional) Peer cost advertised to remote peers in the capabilities exchange. The valid range is 1 through 5. |
| lf size | (Optional) Largest frame size for this local peer. Valid sizes are the following: 516-516 byte maximum frame size 1470-1470 byte maximum frame size 1500-1500 byte maximum frame size 2052-2052 byte maximum frame size 4472-4472 byte maximum frame size 8144-8144 byte maximum frame size 11407-11407 byte maximum frame size 11454-11454 byte maximum frame size 17800-17800 byte maximum frame size |
| keepalive seconds | (Optional) Default remote peer keepalive interval in seconds. The valid range is 0 through 1200 seconds. |
| passive | (Optional) Specifies that the router will not initiate remote peer connections to configured peers. |
| promiscuous | (Optional) Accepts connections from nonconfigured remote peers. |
No parameters are defined.
Global configuration
Use the cost keyword when there are multiple peers to a given destination, to determine which router is preferred and which is capable. The cost keyword only applies in fault tolerance mode.
The following command defines the local peer IP address and specifies the peer group number for this router:
dlsw local-peer peer-id 10.2.17.1 group 2
dlsw duplicate-path-bias
show dlsw capabilities
show dlsw peers
Use the dlsw mac-addr global configuration command to configure a static MAC address. Use the no form of this command to cancel the configuration.
dlsw mac-addr macaddr {ring-group ring | remote-peer {interface serial| macaddr | Specifies the MAC address. |
| ring-group ring | Maps the MAC address to a ring number or ring group number. The valid range is 1 through 4095. |
| remote-peer | Maps the MAC address to a specific remote peer. |
| interface serial number | Specifies the remote peer by direct serial interface. |
| ip-address ip-address | Specifies the remote peer by IP address. |
| group group | Maps the MAC address to a specified peer group. Valid numbers are in the range 1 through 255. |
No static MAC address is configured.
Global configuration
You can statically define resources to prevent a router from sending explorer frames for the specified resource. For example, you can include the MAC address of a FEP in the configuration for each remote router to eliminate any broadcasts that are searching for a FEP. Alternatively, you can specify a single dlsw icanreach statement in the routers attached to the FEP indicating the MAC address of the FEP. This information is sent to all remote routers as part of the capabilities exchange.
The following example configuration inserts an entry with MAC address 1000.5A12.3456 and a RIF string of 0630.0081.0090 into the RIF cache:
dlsw mac-addr 1000.5A12.3456 remote-peer ip-address 10.17.3.2
show dlsw capabilities
show dlsw peers
Use the dlsw netbios-name global configuration command to configure a static NetBIOS name. Use the no form of this command to cancel the configuration.
dlsw netbios-name netbios-name {ring-group ring | remote-peer {interface| netbios-name | Specifies the NetBIOS name. Wildcards are allowed. |
| ring-group ring | Maps the NetBIOS name to a ring number or ring group number. Test frames for this name will only be sent to LAN ports in this ring group. |
| remote-peer | Maps the NetBIOS name to a specific remote peer. |
| interface serial number | Specifies the remote peer by direct interface. |
| ip-address ip-address | Specifies the remote peer by IP address. |
| group group | Maps the NetBIOS name to a specified peer group. Valid numbers are in the range 1 through 255. |
No static NetBIOS name is configured.
Global configuration
The following example configures a static NetBIOS name and links it to ring group 3:
dlsw netbios-name netname ring-group 3
show dlsw capabilities
show dlsw peers
Use the dlsw peer-on-demand-defaults fst global configuration command to configure FST for peer-on-demand transport. Use the no form of this command to disable the previous assignment.
dlsw peer-on-demand-defaults fst [bytes-netbios-out bytes-list-name | cost cost || bytes-netbios-out bytes-list-name | Configures NetBIOS bytes output filtering for peer-on-demand peers. The bytes-list-name is the name of the previously defined netbios bytes access list filter. |
| cost cost | Specifies the cost to reach peer-on-demand peers. The valid range is 1 through 5. The default cost is 3. |
| host-netbios-out host-list-name | Configures NetBIOS host output filtering for peer-on-demand peers. The host-list-name is the name of the previously defined NetBIOS host access list filter. |
| inactivity minutes | (Optional) Configures the length of time after the peer's circuit count is zero that the peer-on-demand is disconnected. The default is 10 minutes. |
| keepalive keepalive | Configures the peer-on-demand keepalive interval. The valid range is 0 through 1200 seconds. The default is 30 seconds. |
| lf size | (Optional) Largest frame size for this remote peer. Valid sizes are the following: 516-516 byte maximum frame size 1470-1470 byte maximum frame size 1500-1500 byte maximum frame size 2052-2052 byte maximum frame size 4472-4472 byte maximum frame size 8144-8144 byte maximum frame size 11407-11407 byte maximum frame size 11454-11454 byte maximum frame size 17800-17800 byte maximum frame size |
| lsap-output-list access-list-number | Configures LSAP output filtering for peer-on-demand peers. Valid numbers are in the range 200 through 299. |
| port-list port-list-number | Configures a port list for peer-on-demand peers. Valid numbers are in the range 0 through 4095. |
The default peer-on-demand transport is TCP.
Global configuration
The following example configures FST for peer-on-demand transport:
dlsw peer-on-demand-defaults fst
show dlsw capabilitiess
show dlsw peers
Use the dlsw peer-on-demand-defaults tcp global configuration command to configure TCP for peer-on-demand transport. Use the no form of this command to disable the previous assignment.
dlsw peer-on-demand-defaults tcp [bytes-netbios-out bytes-list-name | cost cost || bytes-netbios-out bytes-list-name | (Optional) Configures NetBIOS bytes output filtering for peer-on-demand peers. The bytes-list-name is the name of the previously defined netbios bytes access list filter. |
| cost cost | (Optional) Specifies the cost to reach peer-on-demand peers. The valid range is 1 through 5. The default cost is 3. |
| host-netbios-out host-list-name | (Optional) Configures netbios host output filtering for peer-on-demand peers. Host-list-name is the name of the previously defined netbios host access list filter. |
| inactivity minutes | (Optional) Configures the length of time after the peer's circuit count is zero that the peer-on-demand is disconnected. The default is 10 minutes. |
| keepalive seconds | (Optional) Configures the peer-on-demand keepalive interval. The valid range is 0 through 1200 seconds. The default is 30 seconds. |
| lf size | (Optional) Largest frame size for this remote peer. Valid sizes are the following: 516-516 byte maximum frame size 1470-1470 byte maximum frame size 1500-1500 byte maximum frame size 2052-2052 byte maximum frame size 4472-4472 byte maximum frame size 8144-8144 byte maximum frame size 11407-11407 byte maximum frame size 11454-11454 byte maximum frame size 17800-17800 byte maximum frame size |
| local-ack | (Optional) Configures local acknowledgment for peer-on-demand sessions. |
| lsap-output-list access-list-number | (Optional) Configures local SAP (LSAP) output filtering for peer-on-demand peers. Valid numbers are in the range 200 through 299. |
| port-list port-list-number | (Optional) Configures a port-list for peer-on-demand peers. Valid numbers are in the range 0 through 4095. |
| priority | (Optional) Configures prioritization for peer-on-demand peers. The default state is off. |
The default peer-on-demand transport is TCP.
Global configuration
The following example configures TCP for peer-on-demand transport:
dlsw peer-on-demand-defaults tcp
show dlsw capabilities
show dlsw peers
Use the dlsw port-list global configuration command to map traffic on a local interface (Ethernet, Token Ring, or serial) to remote peers. Use the no form of this command to disable the previous map assignment.
dlsw port-list list-number {serial | tokenring} number| list-number | Port list number. The valid range is 1 through 255. |
| ethernet | serial | tokenring | The interface type, indicated by the keyword serial or tokenring. |
| number | The interface number. |
No port list is configured.
Global configuration
Traffic received from a remote peer is forwarded only to the ports specified in the port list. Traffic received from a local interface is forwarded to peers if the input port number appears in the port list applied to the remote peer definition. The definition of a port list is optional.
The following example configures a DLSw peer port list for Ethernet 1 interface:
dlsw port-list 3 ethernet 1
dlsw bgroup-list
dlsw ring-list
Use the dlsw remote-peer frame relay global configuration command to specify the remote peer with which the router will connect. Use the no form of this command to disable the previous assignments.
dlsw remote-peer list-number frame-relay interface serial number dlci-number [pass-thru]| list-number | Ring list number. The valid range is 1 through 255. The default is 0, which means DLSw+ forwards explorers over all ports or bridge groups on which DLSw+ is enabled. |
| interface serial number | The serial interface number of the remote peer with which the router is to communicate. |
| dlci-number | The DLCI number of the remote peer. |
| pass-thru | (Optional) Passthrough mode is selected. (The default, if nothing is specified, is Local Acknowledgment mode.) |
| cost cost | (Optional) Cost to reach this remote peer. The valid range is 1 through 5. |
| lf size | (Optional) Largest frame size for this local peer. Valid sizes are the following: 516-516 byte maximum frame size 1470-1470 byte maximum frame size 1500-1500 byte maximum frame size 2052-2052 byte maximum frame size 4472-4472 byte maximum frame size 8144-8144 byte maximum frame size 11407-11407 byte maximum frame size 11454-11454 byte maximum frame size 17800-17800 byte maximum frame size |
| keepalive seconds | (Optional) Sets the keepalive interval for this remote peer. The range is 0 through 1200 seconds. |
| lsap-output-list list | (Optional) Filters output IEEE 802.5 encapsulated packets. Valid access list numbers are in the range 200 through 299. |
| host-netbios-out host-list-name | (Optional) Configures NetBIOS host output filtering for this peer. The host-list-name is the name of the previously defined NetBIOS host access list filter. |
| bytes-netbios-out bytes-list-name | (Optional) Configures NetBIOS bytes output filtering for this peer. The bytes-list-name is the name of the previously defined NetBIOS bytes access list filter. |
No defaults are specified.
Global configuration
The cost keyword specified in a remote peer statement takes precedence over the cost learned as part of the capabilities exchange with the remote peer. The cost keyword is relevant only in fault tolerance mode.
The following example specifies Frame Relay encapsulation connection for remote peer transport:
dlsw remote-peer 0 frame-relay interface 0 30
dlsw local-peer
show dlsw capabilities
show dlsw peers
Use the dlsw remote-peer fst global configuration command to specify a Fast-Sequenced Transport (FST) encapsulation connection for remote peer transport. Use the no form of this command to disable the previous assignments.
dlsw remote-peer list-number fst ip-address [cost cost] [lf size] [keepalive seconds]| list-number | Ring list number. The valid range is 1 through 255. The default is 0, which means DLSw+ forwards explorers over all ports or bridge groups on which DLSw+ is enabled. |
| ip-address | IP address of the remote peer with which the router is to communicate. |
| cost cost | (Optional) Cost to reach this remote peer. The valid range is 1 through 5. |
| lf size | (Optional) Largest frame size for this local peer. Valid sizes are the following: 516-516 byte maximum frame size 1470-1470 byte maximum frame size 1500-1500 byte maximum frame size 2052-2052 byte maximum frame size 4472-4472 byte maximum frame size 8144-8144 byte maximum frame size 11407-11407 byte maximum frame size 11454-11454 byte maximum frame size 17800-17800 byte maximum frame size |
| keepalive seconds | (Optional) Sets the keepalive interval for this remote peer. The range is 0 through 1200 seconds. |
| lsap-output-list list | (Optional) Filters output IEEE 802.5 encapsulated packets. Valid access list numbers are in the range 200 through 299. |
| host-netbios-out host-list-name | (Optional) Configures NetBIOS host output filtering for this peer. The host-list-name is the name of the previously defined NetBIOS host access list filter. |
| bytes-netbios-out bytes-list-name | (Optional) Configures NetBIOS bytes output filtering for this peer. The bytes-list-name is the name of the previously defined NetBIOS bytes access list filter. |
| backup-peer ip-address | (Optional) Configures a backup to an existing TCP/FST peer. |
No FST encapsulation connection is specified.
Global configuration
The cost keyword specified in a remote peer statement takes precedence over the cost learned as part of the capabilities exchange with the remote peer. The cost keyword is relevant only in fault tolerance mode.
The following example specifies an FST encapsulation connection for remote peer transport:
dlsw remote-peer 1 fst 10.2.17.8
dlsw local-peer
show dlsw capabilities
show dlsw peers
Use the dlsw remote-peer interface global configuration command when specifying a point-to-point direct encapsulation connection. Use the no form of this command to disable previous interface assignments.
dlsw remote-peer list-number interface serial number [cost cost] [lf size] [keepalive seconds]| list-number | Ring list number. The valid range is 1 through 255. The default is 0, which means all. |
| serial number | Specifies the remote peer by direct serial interface. |
| cost cost | (Optional) Cost to reach this remote peer. The valid range is 1 through 5. |
| lf size | (Optional) Largest frame size for this remote peer. Valid sizes are the following: 516-516 byte maximum frame size 1470-1470 byte maximum frame size 1500-1500 byte maximum frame size 2052-2052 byte maximum frame size 4472-4472 byte maximum frame size 8144-8144 byte maximum frame size 11407-11407 byte maximum frame size 11454-11454 byte maximum frame size 17800-17800 byte maximum frame size |
| keepalive seconds | (Optional) Sets the keepalive interval for this remote peer. The range is 0 through 1200 seconds. |
| lsap-output-list list | (Optional) Filters output IEEE 802.5 encapsulated packets. Valid access list numbers are in the range 200 through 299. |
| host-netbios-out host-list-name | (Optional) Configures NetBIOS host output filtering for this peer. The host-list-name is the name of the previously defined NetBIOS host access list filter. |
| bytes-netbios-out bytes-list-name | (Optional) Configures NetBIOS bytes output filtering for this peer. The bytes-list-name is the name of the previously defined NetBIOS bytes access list filter. |
| backup-peer ipaddress | (Optional) Configures a backup to an existing peer. |
No point-to-point direct encapsulation connection is specified.
Global configuration
The cost keyword specified in a remote peer statement takes precedence over the cost learned as part of the capabilities exchange with the remote peer. The cost keyword is relevant only in fault tolerance mode.
The following example specifies a point-to-point direct encapsulation connection for remote peer transport:
dlsw remote-peer 1 interface serial 2
show dlsw peers
show interfaces
Use the dlsw remote-peer tcp global configuration command to identify the IP address of a peer with which to exchange traffic using TCP. Use the no form of this command to remove a remote peer.
dlsw remote-peer list-number tcp ip-address [priority]| list-number | Remote peer ring group list number. This ring group list number default is 0. Otherwise, this value must match the number you specify with the dlsw ring-list, dlsw port-list or dlsw bgroup-list command. |
| tcp ip-address | IP address of the remote peer with which the router is to communicate. |
| priority | (Optional) Enables prioritization features for this remote peer. Valid TCP port numbers are the following: high: 2065 medium: 1981 normal: 1982 low: 1983 |
| cost cost | (Optional) The cost to reach this remote peer. The valid range is 1 through 5. |
| lf size | (Optional) Largest frame size for this remote peer. Valid sizes are the following: 516-516 byte maximum frame size 1470-1470 byte maximum frame size 1500-1500 byte maximum frame size 2052-2052 byte maximum frame size 4472-4472 byte maximum frame size 8144-8144 byte maximum frame size 11407-11407 byte maximum frame size 11454-11454 byte maximum frame size 17800-17800 byte maximum frame size |
| keepalive seconds | (Optional) Sets the keepalive interval for this remote peer. The range is 0 through 1200 seconds. |
| tcp-queue-max size | (Optional) Maximum output TCP queue size for this remote peer. The valid maximum TCP queue size is a number in the range 10 through 2000. |
| lsap-output-list list | (Optional) Filters output IEEE 802.5 encapsulated packets. Valid access list numbers are in the range 200 through 299. |
| host-netbios-out host-list-name | (Optional) Configures NetBIOS host output filtering for this peer. The host-list-name is the name of the previously defined NetBIOS host access list filter. |
| bytes-netbios-out bytes-list-name | (Optional) Configures NetBIOS bytes output filtering for this peer. The bytes-list-name is the name of the previously defined NetBIOS bytes access list filter. |
| backup-peer ip-address | (Optional) Configures a backup to an existing peer. |
No peer IP address is identified.
Global configuration
The following example specifies a TCP encapsulation connection for remote peer transport:
dlsw remote-peer 1 tcp 10.2.17.8
dlsw ring-list
show dlsw capabilities
show dlsw peers
Use the dlsw ring-list to configure a ring list, mapping traffic on a local interface to remote peers. Use the no form of this command to cancel the definition.
dlsw ring-list list-number rings ring-number| list-number | Ring list number. The valid range is 1 through 255. |
| rings | Specify one or more physical or virtual ring. |
| ring-number | Physical or virtual ring number. The valid range is 1-4095. |
There is no default setting.
Global configuration
Traffic received from a remote peer is forwarded only to the rings specified in the ring list. Traffic received from a local interface is forwarded to peers if the input ring number appears in the ring list applied to the remote peer definition. The definition of a ring list is optional.
The following example configures a DLSw ring list, assigning rings 1, 2, and3 to ring list 3:
dlsw ring-list 3 rings 1 2 3
dlsw bgroup-list
dlsw port-listt
show dlsw capabilities
show dlsw peers
Use the dlsw timer global configuration command to tune an existing configuration parameter. Use the no form of this command to restore the default parameters.
dlsw timer {icannotreach-block-time | netbios-cache-timeout | netbios-explorer-timeout || icannotreach-block-time time | Cache life of unreachable resource, during which searches for that resource are blocked. The valid range is 1 through 86400 seconds. The default is 0 (disabled). |
| netbios-cache-timeout time | Cache life of NetBIOS name location for both local and remote reachability cache. The valid range is 1 through 86400 seconds. The default is 16 minutes. |
| netbios-explorer-timeout time | Length of time that this router waits for an explorer response before marking a resource unreachable (LAN and WAN). The valid range is 1 through 86400 seconds. The default is 6 seconds. |
| netbios-retry-interval time | NetBIOS explorer retry interval (LAN only). The valid range is 1 through 86400 seconds. The default is 1 second. |
| netbios-verify-interval time | Interval between the creation of a cache entry and when the entry is marked as stale. If a search request comes in for a stale cache entry, a directed verify query is sent to assure that it still exists. The valid range is 1 through 86400 seconds. The default is 4 minutes. |
| sna-cache-timeout time | Length of time that an SNA MAC/SAP location cache entry exists before it is discarded (local and remote). The valid range is 1 through 86400 seconds. The default is 16 minutes. |
| sna-explorer-timeout time | Length of time that this router waits for an explorer response before marking a resource unreachable (LAN and WAN). The valid range is 1 through 86400 seconds. The default is 3 minutes. |
| sna-retry-interval time | Interval between SNA explorer retries (LAN). The valid range is 1 through 86400 seconds. The default is 30 seconds. |
| sna-verify-interval time | Interval between the creation of a cache entry and when the entry is marked as stale. If a search request comes in for a stale cache entry, a directed verify query is sent to assure that it still exists. The valid range is 1 through 86400 seconds. The default is 4 minutes. |
Global configuration
The following example configures the length of time that an SNA MAC/SAP location cache entry exists before it is discarded:
dlsw timer sna-cache-timeout 3
Use the qllc dlsw interface configuration command to enable DLSw+ over QLLC. Use the no form of this command to cancel the configuration.
qllc dlsw {subaddress subaddress} | {pvc pvc-low [pvc-high]} [vmac vmacaddr| subaddress subaddress | An X.121 subaddress. Any incoming call whose X.121 destination address matches the router's X.121 address and this subaddress will be dispatched to DLSw+ (with an ID.STN IND). If a router is providing several QLLC services different subaddresses must be used to discriminate between them. Subaddresses can be used even if a remote X.25 device is not explicitly mapped to a specific virtual MAC address. This is most useful when PU2.1 devices are connecting to a host because the X.25 device's control point name and network name are used to validate the connection, rather than some virtual MAC address. The subaddress is optional. If no subaddress is provided, any incoming call that matches the router's X.121 address will be dispatched to DLSw+. On outgoing calls the subaddress is concatenated to the interface's X.121 address. |
| pvc | Map one or more Permanent Virtual Circuits to a particular QLLC service (in this case DLSw+). QLLC will attempt to reach the partner by sending and ID.STN.IND to DLSw+. |
| pvc-low | Lowest logical channel number (LCN) for a range of X.25 Permanent Virtual Circuits (PVCs). Acceptable values for PVCs are decimal numbers between 1 and 4095. There is no default value. |
| pvc-high | (Optional) Highest LCN. If not specified the range of PVCs consists of just one PVC. |
| vmac vmacaddr | (Optional) Define either the only virtual MAC address used for DLSw+, or else the lowest virtual MAC address in a pool of virtual MAC addresses. When DLSw+ receives a CUR (cs) to a virtual MAC address in the pool, the QLLC code will attempt to set up a virtual circuit to the X.121 address that maps to the virtual MAC address specified. If an Incoming Call is received, QLLC sends an ID.STN.IND with a virtual MAC address from the pool to DLSw+. If there is no virtual MAC address, then the x25 map qllc or x25 pvc qllc command must provide a virtual MAC address. |
| poolsize | (Optional) Specify the number of contiguous virtual MAC addresses that have been reserved for DLSw+. If the parameter is not present, then just one virtual MAC address is available. |
| partner partner-mac-address | Specify the virtual MAC address to which an Incoming Call wishes to connect. The qllc dlsw command must be repeated for each different partner. Each partner is identified by a unique subaddress. |
| sap ssap dsap | Override the default SAP values (04) for a Token Ring connection. dsap refers to the partner's sap address; ssap applies to the virtual MAC address that corresponds to the X.121 device. |
| xid xidstring | XID Format 0 Type 2 string. |
| npsi-poll | Inhibits forwarding a null XID on the X.25 link. Instead the router will send a null XID Response back to the device that sent the null XID Command. This parameter is needed to support PU2.0 on the partner side that wishes to connect to a FEP on the X.25 side. In a Token Ring or DLSw+ environment the PU2.0 will send a null XID to the FEP. If the router forwards this null XID to an X.25 attached FEP the FEP will assume that it is connecting to PU2.1, and will break off the connection when the PU2.0 next send an XID Format 0 Type 2. |
No defaults are specified.
Interface configuration
The following commands assign virtual MAC address 1000.0000.0001 to a remote X.25-attached 3174, which is then mapped to the X.121 address of the 3174 (31104150101) in the X.25-attached router:
x25 address 3110212011 x25 map qllc 1000.000.0001 31104150101 qllc dlsw partner 4000.1161.1234
show qllc
Use the sdlc dlsw interface configuration command to attach SDLC addresses to DLSw+. Use the no form of this command to cancel the configuration.
sdlc dlsw sdlc-address| sdlc-address | SDLC address in hexadecimal. The valid range is 1 through FE. |
No correspondence is defined.
Interface configuration
The following command attaches SDLC address d2 to DLSw+:
sdlc dlsw d2
encapsulation sdlc
sdlc address
sdlc role
Use the show dlsw capabilities privileged EXEC command to display the configuration of the peer specified or of all peers.
show dlsw capabilities [interface {type number} | ip-address ip-address | local]| interface type | (Optional) The interface type is indicated by the keyword ethernet, null, serial, or tokenring. |
| number | (Optional) The interface number. |
| ip-address ip-address | (Optional) Specifies a remote peer by its IP address. |
| local | (Optional) Specifies the local DLSw peer. |
Privileged EXEC
The following is sample output from the show dlsw capabilities command:
Flounder# show dlsw capabilities
DLSw: Capabilities for peer 10.2.17.7(2065)
vendor id (OUI) : '00C' (cisco)
version number : 1
release number : 0
init pacing window : 10
unsupported saps : none
num of tcp sessions : 1
loop prevent support : no
icanreach mac-exclusive : no
icanreach netbios-excl. : no
reachable mac addresses : none
reachable netbios names : none
cisco version number : 1
local-ack capable : yes
priority capable : no
peer group number : 10
border peer capable : yes
peer cost : 3
border peer for group 10 : peer 10.2.17.7(2065) cost 3
version string :
Table 26-1 describes significant fields shown in the display.
| Field | Description |
|---|---|
| vendor id (OUI) | Vendor ID is cisco |
| version number | DLSw Version Number = 1 |
| release number | Release = 0 |
| init pacing window | Initial Pacing Window = 10 |
| unsupported saps | Unsupported Saps = 0 |
| num of tcp sessions | Number of TCP session = 1 |
| loop prevent support | No Loop Prevent Support no |
| icanreach mac-exclusive | icanreach mac-exclusive = no |
| icanreach netbios-excl. | icanreach netbios-exclusive = no |
| reachable mac address | Reachable MAC Address |
| reachable netbios name | Reachable Netbios Name |
| cisco version number | Cisco Version Number = 1 |
| local-ack capable | Local Ack Capable = yes |
| priority capable | Priority Capability = yes |
| peer group number | Peer Group Member Number |
| border peer capable | Border Peer Capability = yes |
| peer cost | Peer Cost = 3 |
| border peer for group 10 | Peer 10.2.17.7 (2065) Cost = 3 |
| version string |
Use the show dlsw circuit privileged EXEC command to display the state of all circuits involving this MAC address as a source and destination.
show dlsw circuitsThis command has no arguments or keywords.
Privileged EXEC
The following is sample output from the show dlsw circuit command:
oregon#show dlsw circuits
oregon#show dlsw circuits
Index local addr(lsap) remote addr(dsap) state
4D00 4006.313c.a07f(F0) 0800.5a8f.8822(F0) CONNECTED
Slot:0 Port:4 Type:ETH peer 10.2.32.1(2065)
7500 4006.313c.a07f(04) 0800.5a8f.8822(04) CONNECTED
Slot:0 Port:4 Type:ETH peer 10.2.32.1(2065)
Table 26-2 describes significant fields shown in the display
| Field | Description |
|---|---|
| Index | Index = 4D00 |
| local addr (lsap) | Local Address (LSAP) = 4066.313c.a07f (F0) |
| remote addr (dsap) | Remote Address (DSAP) = 0800.5a8f.8822 |
| state | Connected |
Use the show dlsw fastcache privileged EXEC command to display the fast cache for FST and direct-encapsulated peers.
show dlsw fastcacheThis command has no arguments or keywords.
Privileged EXEC
The following is sample output from the show dlsw fastcache command:
oregon#show dlsw fastcache
peer local-mac remote-mac l/r sap rif
FST 10.2.32.1 0800.5a8f.881c 0800.5a8f.8822 04/04 0680.02D5.1360
Table 26-3 describes significant fields shown in the display.
| Field | Description |
|---|---|
| peer | Peer = FST 10.2.32.1 |
| local-mac | Local MAC = 0800.5a8f.881c |
| remote-mac | Remote MAC = 0800.5a8f.8822 |
| l/r sap | Local/Remote SAP 4/4 |
| rif | RIF 0680.02D5.1360 |
Use the show dlsw peers privileged EXEC command to display DLSw peer information.
show dlsw peers [interface {ethernet number | null number | serial number | tokenring| interface {ethernet number | null number | serial number | tokenring number} | (Optional) Specifies a remote peer by a direct interface. |
| ip-address ip-address | (Optional) Specifies a remote peer by its IP address. |
Privileged EXEC
The following is sample output from the show dlsw peers command:
oregon#show dlsw peers ip-address 10.2.32.1
Peers: state rg_lst pkts_rx pkts_tx type drops group border
TCP 10.2.32.1 CONNECT 0 79170 50816 conf 0 0 no
Table 26-4 describes significant fields shown in the display.
Peers | Information related to the remote peer, including encapsulation type, IP address (if using FST, TCP), and interface number (if using direct encapsulation.) |
| state | State of the peer: CONNECT: normal working peer DISCONN: peer is not connected CAP_EXG: capabilities exchange mode. Waiting for capabilities response. WAIT_RD: TCP write pipe (local port 2065) is open and peer is waiting for remote peer to open the read port (local port 2067). This field applies only to TCP peers. WAN_BUSY: Tcp outbound queue is full. This field applies only to TCP peers. |
| p_lst | Port list number. The default is 0. The possible range is 1 through 255. The p_lst number can be used on port, ring, and bgroup lists. The number is the means by which all 3 lists are associated |
| pkts_rx | Number of received packets. |
| pkts_tx | Number of transmitted packets. |
| type | conf : configuration prom : promiscuous pod : peer on demand |
| drops | Reasons for the counter to increment: Wan interface not being up for a direct peer. Dlsw tries to send a pak before the peer is fully connected (waiting for TCP event or capabilities event). Outbound tcp queue full FST sequence number count mismatch Can't get buffer to "slow switch" FST packet Cbus controller failure on high end (can't move packet from receive buffer to transmit buffer, or vice versa) Destination ip address of fst packet does not match local peer-id Wan interface not being up for an fst peer No srb route cache command configured Madge ring buffer is full on low end systems (wan feeding lan too fast) |
| group | Peer group number. Valid range is 1 to 255. |
| border | YES = border peer capable NO = Not a border peer |
Use the show dlsw reachability privileged EXEC command to display DLSw reachability information.
show dlsw reachabilityThis command has no arguments or keywords.
Privileged EXEC
The following is sample output from the show dlsw reachability command:
oregon#show dlsw reachability
DLSw MAC address reachability cache list
Mac Addr status Loc. peer/port rif
0000.f62e.6366 FOUND LOCAL P000-S001 06B0.1F41.7D00
0004.f5d9.fa27 FOUND LOCAL P000-S001 0A90.00B2.0321.1F41.7D00
0800.5a30.7a9b FOUND REMOTE 150.150.10.1(2065)
DLSw NetBIOS Name reachability cache list
NetBIOS Name status Loc. peer/port rif
EMILY FOUND LOCAL P000-S001 06B0.1F41.7D00
ROSE FOUND REMOTE 150.150.10.1(2065)
Table 26-5 describes significant fields shown in the display.
| Field | Description |
|---|---|
| Mac Addr | Mac address of station being sought.(Destination MAC address of canureach_ex packet) |
| status | Result of search: FOUND SEARCHING: NOT_FOUND: Negative caching is on, and the station has not responded to queries. UNCONFIRMED: Station configured, but DLSw has not had a chance to verify it VERIFY: verifying cache information, either because cache going stale, or verifying user configuration. entry. |
| loc | Location of station: LOCAL: On the local network REMOTE: On the remote network |
| peer/port | Peer/Port Number If the Location is REMOTE, this denotes the peer through which the station was found to be reachable. If the station is LOCAL, this denotes the port through which this station was found to be reachable. For ports, the port number and slot number are given. "Pxxx-Syyy" denotes port xxx slot yyy. If the station is reachable through a bridge group, that is shown by "TBridge-xxx" |
| rif | Currently this column applies only to LOCAL stations. If the station was reached through some media that does not support rifs (such as SDLC or Ethernet) then dlsw shows "--no rif--." Otherwise, the actual rif in the cache is shown. |
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