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Implementing IS-IS on Cisco IOS XR Software
How to Implement IS-IS on Cisco IOS XR Software
RC-279
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Step 4
is-type {level-1 | level-1-2 | level-2-only}
Example:
RP/0/RP0/CPU0:router(config-isis)# is-type
level-2-only
(Optional) Configures the system type (area or backbone
router).
• By default, every IS-IS instance acts as a level-1-2
router.
• The level-1 keyword configures the software to perform
Level 1 (intra-area) routing only. Only Level 1
adjacencies are established. The software learns about
destinations inside its area only. Any packets
containing destinations outside the area are sent to the
nearest level-1-2 router in the area.
• The level-2-only keyword configures the software to
perform Level 2 (backbone) routing only, and the router
establishes only Level 2 adjacencies, either with other
Level 2-only routers or with level-1-2 routers.
• The level-1-2 keyword configures the software to
perform both Level 1 and Level 2 routing. Both Level 1
and Level 2 adjacencies are established. The router acts
as a border router between the Level 2 backbone and its
Level 1 area.
Step 5
end
or
commit
Example:
RP/0/RP0/CPU0:router(config-isis)# end
or
RP/0/RP0/CPU0:router(config-isis)# commit
Saves configuration changes.
• When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
–
Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
–
Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
–
Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
• Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Step 6
show isis [instance instance-id] protocol
Example:
RP/0/RP0/CPU0:router# show isis protocol
(Optional) Displays summary information about the IS-IS
instance.
Command or Action Purpose