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Can you mix clns devices with IP devices in a Integrated IS-IS network?

My experience says that the only thing that yoy can mix in a LAN with IP and CLNS enabled with Integrated IS-IS ,is ES devices and IP devices.

If you have an IS (SDH/OPtical) device at L1 in a LAN and you put "ip router isis" in the interface (the routing protocol is Integrated IS-IS), the device change the adjacency to IS ando you can´t ping it.

The message appeared in the log (debug isis adjacency) is the following.

ISIS-Adj: Rec L1 IIH from 00a0.fa00.1018 (Ethernet0), cir type 1, cir id 00A0.FA00.1018.01

ISIS-Adj: No usable IP interface addresses in LAN IIH from Ethernet0

The same behaviour is reached if you put only in one interface of the L1 Area "ip router isis" .

Is this the normal behaviour of the router?

Integrated IS-IS have this limitation?



Re: Can you mix clns devices with IP devices in a Integrated IS-

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.