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Webcast-Catalyst9k

IS-IS adjacency problem

Hi all

classic problem where looks right, but no adjacency is established.

I checked MTU, authentication, I can ping remote interface.

R1

interface TenGigabitEthernet2/3.304

encapsulation dot1Q 304

ip address x.x.x.x 255.255.255.254

ip pim sparse-dense-mode

ip router isis

isis circuit-type level-2-only

isis network point-to-point

isis authentication mode md5

isis authentication key-chain sam

isis csnp-interval 10

R2

interface Vlan304

ip address x.x.x.x 255.255.255.254

ip pim sparse-dense-mode

ip router isis

carrier-delay msec 16

isis circuit-type level-2-only

isis network point-to-point

isis authentication mode md5

isis authentication key-chain sam

on R2 shows ES-IS & R1 show init state

TIA

Sam

5 REPLIES

Re: IS-IS adjacency problem

Are you using IP subnet zero in your configuration?

The subnet mask seems to suggest the same.

Can you try changing the SM to /30 and check

Also post the output of debug isis adj-packets

HTH, rate if it does

Narayan

Re: IS-IS adjacency problem

Hi there

as everything was adding up and adjacency was still down...I reloaded the router and all is fine. Unfortunately, I can tell what was the initial cause.

Thanks

Sam

Re: IS-IS adjacency problem

Hi Sam,

can you please also post your "router isis" config? Second, does it work when only configuring "ip router isis" on the interfaces and nothing else relating to isis?

Regards, Martin

Re: IS-IS adjacency problem

Sam,

Do u mean to say it is working now?

Maybe you should have tried clearing the ISIS process once :-)

Narayan

Re: IS-IS adjacency problem

yes it sis working.

I have actually removed IS-IS under interfaces from both sides and reconfigured again. teh cisco recomemndation is that if all looks as it should but adjacency is not established....contact TAC, I tried a reload.

it will be interesting to see if this issue will come up again.

Thanks again !

Sam

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