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This chapter explains the function and syntax of the International Organization for Standardization (ISO) Connectionless Network Services (CLNS) protocol commands: show tarp host through which-route. For more information about defaults and usage guidelines, see the corresponding chapter of the Cisco IOS Apollo Domain, Banyan VINES, DECnet, ISO CLNS, and XNS Command Reference, Release 12.1.
To display information about a specific TARP router stored in the local TID cache, use the show tarp host command in EXEC mode.
show tarp host tid
Syntax Description
tid Target identifier of the router from which you want information. Alphanumeric string up to 255 characters.
To list all interfaces that have TARP enabled, use the show tarp interface command in EXEC mode.
show tarp interface [type number]
Syntax Description
type (Optional) Interface type. number (Optional) Interface number.
To display the contents of the loop-detection buffer table, use the show tarp ldb command in EXEC mode.
show tarp ldbSyntax Description
This command has no arguments or keywords.
To list all static entries in the TID cache that were configured with the tarp map command, use the show tarp map command in EXEC mode.
show tarp mapSyntax Description
This command has no arguments or keywords.
To list all static TARP adjacencies that are configured with the tarp route-static command, use the show tarp static-adjacencies command in EXEC mode.
show tarp static-adjacenciesSyntax Description
This command has no arguments or keywords.
To display information about the entries in the TID cache, use the show tarp tid-cache command in EXEC mode. Entries are created dynamically, statically, or as a result of assigning a TID to the device by using the tarp tid command.
show tarp tid-cache [detail]
Syntax Description
detail (Optional) Lists additional information in the TID/NET cache (such as the expiration time for dynamic entries).
To display statistics about TARP PDUs since the last time the counters were cleared, use the show tarp traffic command in EXEC mode.
show tarp trafficSyntax Description
This command has no arguments or keywords.
To reenable the storage of TID-to-NSAP address mapping in the TID cache, use the tarp allow-caching command in global configuration mode. To disable this function and clear the TID cache, use the no form of this command.
tarp allow-cachingSyntax Description
This command has no arguments or keywords.
To set the timeout for TARP Type 5 PDUs, use the tarp arp-request-timer command in global configuration mode. To set the timeout to the default value, use the no form of this command.
tarp arp-request-timer seconds
Syntax Description
seconds Number of seconds that the router will wait for a response from a TARP Type 5 PDU. The range is from 0 to 3600 seconds. The default is 40 seconds.
To blacklist the specified router so that the router does not receive TARP PDUs propagated by this router, use the tarp blacklist-adjacency command in global configuration mode. To remove the specified router from the blacklist so that the router can once again receive propagated TARP PDUs, use the no form of this command.
tarp blacklist-adjacency nsap
Syntax Description
nsap NSAP address that cannot receive TARP PDUs. Use the full NSAP address.
To specify the length of time that a dynamically created TARP entry remains in the TID cache, use the tarp cache-timer command in global configuration mode. To set the timer to the default value, use the no form of this command.
tarp cache-timer seconds
Syntax Description
seconds Number of seconds an entry remains in the TID cache. The range is 30 to 86,400 seconds. The default is 3,600 seconds (1 hour).
To enable the TARP on an interface, use the tarp enable command in interface configuration mode. To disable TARP on a particular interface, use the no form of this command.
tarp enableSyntax Description
This command has no arguments or keywords.
To reenable the capability to propagate TARP PDUs globally, use the tarp global-propagate command in global configuration mode. To disable global propagation of TARP PDUs, use the no form of this command.
tarp global-propagateSyntax Description
This command has no arguments or keywords.
To specify the length of time that a system ID-to-sequence number mapping entry remains in the loop-detection buffer table, use the tarp ldb-timer command in global configuration mode. To set the timer to the default value, use the no form of this command.
tarp ldb-timer seconds
Syntax Description
seconds Number of seconds that a system ID-to-sequence number mapping entry remains in the loop-detection buffer table. The range is 0 to 86,400 seconds. The default is 300 seconds.
To specify the lifetime for locally generated TARP PDUs based on the number of hops, use the tarp lifetime command in global configuration mode. To set the PDU lifetime to the default value, use the no form of this command.
tarp lifetime hops
Syntax Description
hops Number of hosts that a PDU can traverse before it is discarded. Each router represents one hop. The range is 0 to 65535 hops. The default is 100 hops.
To enter a TID-to-NSAP static route in the TID cache, use the tarp map command in global configuration mode. To remove a static map entry from the TID cache, use the no form of this command.
tarp map tid nsap
Syntax Description
tid Target identifier to be mapped to the specified NSAP. Alphanumeric string up to 255 characters. nsap NSAP address to map to the specified TID. Use the full NSAP address.
To specify the N-selector to be used in CLNP PDUs to indicate that the packet is a TARP, use the tarp nselector-type command in global configuration mode. To set the N-selector to the default value, use the no form of this command.
tarp nselector-type hex-digit
Syntax Description
hex-digit Digit in hexadecimal format to be used to identify TARP PDUs. The default is AF.
To reenable the router to originate TARP PDUs, use the tarp originate command in global configuration mode. To disable the capability to originate TARP PDUs, use the no form of this command.
tarp originateSyntax Description
This command has no arguments or keywords.
To specify the length of time that a router waits for a response to a Type 2 PDU after the default timer expires, use the tarp post-t2-response-timer command in global configuration mode. To set the timer to the default value, use the no form of this command.
tarp post-t2-response-timer seconds
Syntax Description
seconds Number of seconds that the router will wait for a response for a Type 2 PDU after the default timer has expired. The range is 0 to 3600 seconds. The default is 15 seconds.
To reenable propagation of TARP PDUs on an interface, use the tarp propagate command in interface configuration mode. To disable propagation of TARP PDUs on one or more interfaces, use the no form of this command.
tarp propagate [all | message-type type-number [type-number] [type-number]]
Syntax Description
all (Optional) Specifies all TARP PDUs. message-type type-number (Optional) Specifies only type-number broadcast PDUs. Valid values are 1, 2, and 4. You may enter more than one value for the type-number argument.
To specify the network protocol type to be used in outgoing TARP PDUs, use the tarp protocol-type command in global configuration mode. To set the protocol type to the default value, use the no form of this command.
tarp protocol-type hex-digit
Syntax Description
hex-digit Digit in hexadecimal format to be used to identify the protocol used in outgoing TARP PDUs. The default is FE (for CLNP).
To a specific NSAP address, use the tarp query command in EXEC mode to determine a corresponding TID entry.
tarp query nsap
Syntax Description
nsap NSAP address that you want the TID for. Use the full NSAP address.
To determine an NSAP address corresponding to a specified TID, use the tarp resolve command in EXEC mode.
tarp resolve tid [1 | 2]
Syntax Description
tid Target identifier to be mapped to the specified NSAP. Alphanumeric string up to 255 characters. 1 (Optional) Sends a Type 1 PDU. The default is a Type 1 PDU. If a response is not received before the timeout period, a Type 2 PDU is sent. 2 (Optional) Sends only Type 2 PDU.
To configure a static TARP adjacency, use the tarp route-static command in global configuration mode. To remove a static TARP adjacency from the TARP queue, use the no form of this command.
tarp route-static nsap [all | message-type type-number [type-number] [type-number]]
Syntax Description
nsap NSAP address to create a static TARP adjacency. Use the full NSAP address. all (Optional) Specifies all TARP PDUs. message-type type-number (Optional) Specifies only type-number broadcast PDUs. Valid values are 1, 2, and 4. You may enter more than one type-number.
To start the TARP process on the router, use the tarp run command in global configuration mode. To stop the TARP process, use the no form of this command.
tarp runSyntax Description
This command has no arguments or keywords.
To specify the sequence number to be used in the next outgoing TARP PDU, use the tarp sequence-number command in global configuration mode. To return to the default value, use the no form of this command.
tarp sequence-number number
Syntax Description
number Number from 0 to 65535 that will be used as the sequence number in the next outgoing PDU. The default is 0.
To specify the length of time the router will wait for a response from a Type 1 PDU, use the tarp t1-response-timer command in global configuration mode. To set the timer to the default value, use the no form of this command.
tarp t1-response-timer seconds
Syntax Description
seconds Number of seconds that the router will wait to receive a response from a Type 1 PDU. The range is 0 to 3600 seconds. The default is 15 seconds.
To specify the length of time the router will wait for a response from a Type 2 PDU, use the tarp t2-response-timer command in global configuration mode. To set the timer to the default value, use the no form of this command.
tarp t2-response-timer seconds
Syntax Description
seconds Number of seconds that the router will wait to receive a response from a Type 2 PDU. The range is 0 to 3600 seconds. The default is 25 seconds.
To assign a TID to the router, use the tarp tid command in global configuration mode. To remove the TID from the router, use the no form of this command.
tarp tid tid
Syntax Description
tid Target identifier to be used by this router. Alphanumeric string up to 255 characters.
To set the update remote cache bit in all subsequent outgoing PDUs, use the tarp urc command in global configuration mode. To set the update remote cache bit to the default value, use the no form of this command.
tarp urc {0 | 1}
Syntax Description
0 Sets the update remote cache bit to 0, which is the default value. When the bit is 0, the receiver PDU will update its TID cache entry. 1 Sets the update remote cache bit to 1. When the bit is 1, the receiver TID cache is not updated.
To configure ISO IGRP timers, use the timers basic command in router configuration mode. To restore the default values, use the no form of this command.
timers basic update-interval holddown-interval invalid-interval
Syntax Description
update-interval Time, in seconds, between the sending of routing updates. The default value is 90 seconds. holddown-interval Time, in seconds, a system or area router is kept in holddown state, during which routing information regarding better paths is suppressed. (A router enters into a holddown state when an update packet is received that indicates the route is unreachable. The route is marked inaccessible and advertised as unreachable. However, the route is still used for forwarding packets.) When the holddown interval expires, routes advertised by other sources are accepted and the route is no longer inaccessible. The default value is 145 seconds. invalid-interval Time, in seconds, that a route remains in the routing table after it has been determined that it is not reachable. After that length of time, the route is removed from the routing table. The default value is 135 seconds.
If you want to know which next-hop router will be used or if you have multiple processes running and want to troubleshoot your configuration, use the which-route command in EXEC mode. This command displays the routing table in which the specified CLNS destination is found.
which-route {nsap-address | clns-name}
Syntax Description
nsap-address CLNS destination network address. clns-name Destination host name.
Posted: Wed Jul 26 16:51:48 PDT 2000
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