nanog mailing list archives
RE: ISIS route summarization
From: "Ivan Pepelnjak" <ip () ioshints info>
Date: Tue, 24 Feb 2009 11:00:44 +0100
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:jbates () 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
Current thread:
- ISIS route summarization Jack Bates (Feb 23)
- RE: ISIS route summarization Ivan Pepelnjak (Feb 24)
- Re: ISIS route summarization (it's a wrap) Jack Bates (Feb 24)
- Illegal header length in BGP error Matthew Huff (Feb 24)
- Re: Illegal header length in BGP error Renaud RAKOTOMALALA (Feb 24)
- RE: Illegal header length in BGP error Matthew Huff (Feb 24)
- RE: Illegal header length in BGP error Mills, Charles (Feb 24)
- Re: Illegal header length in BGP error Paul Cosgrove (Feb 24)
- RE: Illegal header length in BGP error Matthew Huff (Feb 24)
- Illegal header length in BGP error Matthew Huff (Feb 24)