The short answer is "NO". L2 IS-IS is a single SPF domain and all routers are supposed to have identical view of the network. If you want IS-IS-provided aggregation, you need to use L1 and L2.
There are only two protocols that allow unlimited levels of aggregation: BGP and EIGRP :) Ivan http://www.ioshints.info/about http://blog.ioshints.info/ > -----Original Message----- > From: Jack Bates [mailto:jba...@brightok.net] > Sent: Monday, February 23, 2009 10:26 PM > To: nanog@nanog.org > Subject: ISIS route summarization > > 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. ;) > > > -Jack > > >
