From each edge routers from your customer, just setup static route for each
other's /19 to your network.
That will resolve this problem.
Everything else will use BGP information.
That will make the situation simple and easy to maintain.
Hyun
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hyunseog Ryu / CCDA, MCSE, CCIE candidate(written test passed)
Network Engineer/Applications Engineering
Norlight Telecommunications, Inc.
The Guardians of Data
275 North Corporate Drive
Brookfield, WI 53045-5818
Tel. +1.262.792.7965
Fax. +1.262.792.7733
Nick Kraal
<nick@arc.net.my> To: cisco-nsp@puck.nether.net
cc: (bcc: Hyunseog Ryu/Brookfield/Norlight)
06/17/2002 09:17 Fax to:
AM Subject: [nsp] BGP loop detection
Please respond to
Nick Kraal
We have a customer that has transit services from us. They have split their
network into two /19 and run BGP with us at two different locations. Each
/19 is actually for two seperate businesses; one a tier-2 ISP and the other
VoIP provider. Two physically sperate networks are also running the same
ASN
and are to peer with each other via our network. There is no internal
interconnectivity between them or any IGP running.
The problem lies in that to reach each other they need to 'transit' via our
network and according to BGP, one cannot announce back the client prefixes
learnt from the other network and vice versa as both of them are running
the
same ASN. This is to prevent routing loops.
In this case is there a method to overwrite this so that the first /19
network will be able to reach the second /19 network via ours?
Thanks in advance.
-nick/
This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:00 EDT