Thursday, January 07, 2010

ISIS: Router level config takes precedence over Interface level config

Lets say i have this setup
ASBR1 s2/2 --> PE1 s2/0

I want to run ISIS on this interface at Level-2 only.

This wont work
ASBR1
router isis
is-type level-2

int s2/2
ip router isis

PE1
router isis
is-type level-1

int s2/0
ip router isis
isis circuit-type level-2

It seems that on PE1 the Router ISIS (is-type ) cmd takes precedence over int s2/0 ( isis circuit-type) cmd

Strange isn't it , but that ISIS for you.

Once I modified the is-type to level-1-2 ( the default) on PE1, the neighborship came up.

Conclusion: Router ISIS (is-type ) cmd takes precedence over int s2/0 ( isis circuit-type) cmd

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