Command:

show isis topology


Mode:

Router>


Syntax:

show isis area-tag topology [level-1] [level-2] [host-nsap]

 

Syntax Description:

area-tag Meaningful name for a routing process. This name must be unique among all IP or Connectionless Network Service (CLNS) router processes for a given router. If an area tag is not specified, a null tag is assumed and the process is referenced with a null tag. If an area tag is specified, output is limited to the specified area. Required for multiarea IS-IS configuration. Optional for conventional IS-IS configuration.
level-1 (Optional) Paths to all Level 1 routers in the area or areas in which this router resides. The abbreviated keyword l1 may be used in place of level-1.
level-2 (Optional) Paths to all Level 2 routers in the domain. The abbreviated keyword l2 may be used in place of level-2.
host-nsap (Optional) Host name or network service access point (NSAP) of a router for which you would like to check reachability.

 

Command Description:

To display a list of all connected routers in all areas, use the show isis topology command in EXEC mode.

Use the show isis topology EXEC command to verify the presence and connectivity between all routers in all areas.


Example:

The following is sample output from the show isis topology command:

Router#show isis topology
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
Router_A --
Router_B 10 Router_B Et0 00e0.b064.46ec
IS-IS paths to level-2 routers
System Id Metric Next-Hop Interface SNPA
Router_A --
Router_B 10 Router_B Et0 00e0.b064.46ec
Router_C 20 Router_B Et0 00e0.b064.46ec
Router_D Se0 DLCI 100
Router_D Se1 *HDLC*
Router_D 10 Router_D Se0 DLCI 100
Router_D Se1 *HDLC*


Misconceptions:

None.


Related Commands:

show clns es-neighbors
show clns is-neighbors
show clns neighbors
show clns neighbor areas
show clns route

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