07-24-2008 02:46 AM - edited 03-03-2019 10:52 PM
Hi,
Can some body tell me if i have two parallel link between two routers and having IS-Is point to point configure ( /30 network for each link).Does it impact any way if one link fails interms of IS-Is adj and failover time ?
Regards,
Chintan.
07-24-2008 03:26 AM
Hello Chintan,
IS-IS is a link state protocol so the router can understand that the same node is at the remote end of both point-to-point links.(the net address is the exactly the same)
The same LSP data structure is sent out both links.
Of course if one link fails an IS-IS adj will go down but your router can still route and forward on the other link.
Both links are used in load-balancing if you don't configure different IS-IS costs.
Convergence is very fast just the time to rebuild the IS-IS adj on the restored link.
Hope to help
Giuseppe
07-28-2008 02:26 AM
Hi Giuseppe,
I have one link between two router having /30 and another link between same two router having /30. In that case this two router will have have Adj established on each link i mean both link or only on link. "show clns neighbour" or show isis neighbour" shows me remote router id two times with diff Circuit ID ??
I have been told by some one that it established adj on both link so now i am confused.
Chintan.
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