Describe integrated IS-IS

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These questions are derived from the Self Test Software Practice Test for Cisco exam #642-901 – Building Scalable Cisco Internetworks

 

Objective: Describe integrated IS-IS
SubObjective: Configure and verify integrated IS-IS

Single Answer, Multiple Choice

 

Which ISIS command would you use if you wanted to see all paths to reachable ISIS routers and the next hops used to get there along indicated by system ID?

 

 

  1. show isis topology
  2. show ip route
  3. show isis routers
  4. show isis
  5. show isis database

 

Answer:
A. show isis topology

 

Tutorial:
The show isis topology command will show all paths to reachable ISIS routers and the next hops used to get there along indicated by system ID. A sample output of the command is below:

 

Router# show isis topology

 

Area A3253-01:
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
0000.0000.0003 10 0000.0000.0003 Et1 0000.0c03.6944
0000.0000.0005 –
0000.0000.0053 10 0000.0000.0053 Et1 0060.3e58.ccdb

 

Area A3253-02:
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
0000.0000.0002 10 0000.0000.0002 Et2 0000.0c03.6bc5
0000.0000.0005 –
0000.0000.0053 10 0000.0000.0053 Et2 0060.3e58.ccde

 

The show ip route command shows the routers basic routing table and is not specific to ISIS.

 

The show isis routers command is not a valid command.

 

The show isis command is incomplete and requires a keyword at the end.

 

The show isis database command shows the link state database in the ISIS router.

 

Reference:

http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/products_command_reference_chapter09186a008017d02e.html#wp1040751

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