nanog mailing list archives
Multiple BGP Routes in FIB
From: "Glen Kent" <glen.kent () gmail com>
Date: Thu, 7 Sep 2006 22:16:51 +0530
Hi, There is an interesting discussion going on in the IDR WG and i am cross posting a mail on Nanog to hear from the operators, if what is described below, a common practise followed by them:
>> I don't think its correct to advertise one while using both for >> forwarding. >> NOTE: I am assuming that the routes share the same path length but have >> different AS Paths (as mentioned by you earlier in this mail) > > I think this is being done by many providers. Consider two paths for nlri X as_path 1 {x y z} next_hop n1 as_path 2 {m n z} next_hop n2 Are you suggesting that providers are installing ecmp routes for X with next-hops n1 and n2, while advertising only one of the paths to their IBGP peers?Yes.
Do providers really do this? Would they install multiple BGP Paths with different AS Paths (but same length) in their FIB, and yet advertise only one? Is the the right thing to do? Glen
Current thread:
- Multiple BGP Routes in FIB Glen Kent (Sep 07)
- Re: Multiple BGP Routes in FIB Sam Stickland (Sep 08)
- Re: Multiple BGP Routes in FIB Matt Buford (Sep 09)
- RE: Multiple BGP Routes in FIB Tony Li (Sep 09)
- Re: Multiple BGP Routes in FIB Matt Buford (Sep 09)
- RE: Multiple BGP Routes in FIB Tony Li (Sep 09)