ISIS route summarization

Jack Bates jbates at
Mon Feb 23 21:26:06 UTC 2009

In a level2 only ISIS network (not using multiple areas due to MPLS 
limitations), is there a better method for handling aggregate routes 
than creating an aggregate and redistributing it into ISIS for each 
router? Primarily Cisco/Juniper based. Cisco I believe has an aggregate 
option in ISIS (similar to OSPF) and Juniper has a separate aggregate 
function which can be distributed into ISIS. Neither can do 
summarization per say unless they cross between levels; unless I'm mistaken.

Offlist input is fine. Just trying to double check my brain while 
setting up IPv6 on the access edges.

Link state does have it's limitations. ;)


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