[25779] in North American Network Operators' Group
RE: PSI/Digex announcements
daemon@ATHENA.MIT.EDU (Chris Flores)
Thu Nov 11 17:26:52 1999
Message-ID: <83D3AE577F81D31196B10008C7DFB05503ADBD@metexch4.ixc-comm.com>
From: Chris Flores <cflores@ixc-comm.com>
To: 'Joe Shaw' <jshaw@insync.net>, nanog@merit.edu
Date: Thu, 11 Nov 1999 16:26:52 -0600
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Joe,
Yes - this is indeed not optimal. To keep routing tables manageable, BGP
announcements should be aggregated into a shorter prefix such as /20 or /19
(whatever is possible). Many autonomous systems accidentally leak longer
announcements for various reasons; accurate filtering can eliminate these
mistakes. It looks like the autonomous system from your email is
redistributing connected routes - you can start by contacting the
originating autonomous system.
Hope this helps.
CF
-----Original Message-----
From: Joe Shaw [mailto:jshaw@insync.net]
Sent: Thursday, November 11, 1999 3:58 PM
To: nanog@merit.edu
Subject: PSI/Digex announcements
I have a non peering T1 to PSI for VPN customers. While troubleshooting
some problems for one of those VPN customers I came across these:
HOUSTON_BR1#show ip bgp regex ^174$
Network Next Hop Metric LocPrf Weight Path
*> 12.15.224.192/27 38.7.128.1 200 174 i
*> 154.32.255.0/30 38.7.128.1 200 174 i
*> 192.245.179.248/30 38.7.128.1 200 174 i
*> 198.17.203.0/25 38.7.128.1 200 174 i
*> 198.137.240.32/27 38.7.128.1 200 174 i
*> 198.207.208.192/27 38.7.128.1 200 174 iA
*> 204.4.196.32/27 38.7.128.1 200 174 i
*> 204.4.196.64/27 38.7.128.1 200 174 i
*> 204.4.196.96/27 38.7.128.1 200 174 i
*> 204.68.218.0/27 38.7.128.1 200 174 i
*> 204.180.67.160/27 38.7.128.1 200 174 i
*> 206.181.125.188/30 38.7.128.1 0 200 174 i
*> 206.119.241.96/27 38.7.128.1 200 174 i
*> 207.37.154.120/29 38.7.128.1 200 174 i
*> 207.138.126.128/27 38.7.128.1 200 174 i
Isn't it considered "bad" to be announcing nets that small, especially the
/30's?
--
Joseph W. Shaw - jshaw@insync.net
Free UNIX advocate - "I hack, therefore I am."
