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Re: BGP Session Teardown due to AS_CONFED_SEQUENCE in AS4_PATH
From: Rob Shakir <rjs () eng gxn net>
Date: Tue, 20 Jan 2009 14:33:14 +0000
On Tue, Jan 20, 2009 at 01:01:03PM +0100, Mikael Abrahamsson wrote:
have been able to demonstrate that a device running Cisco IOS release
12.0(32)S12 behaves as per this description.
Has anyone looked into IOS XR behaviour, if it's the same as 12.0(32)S12?
Pierfrancesco Caci was kind enough to provide me with some output from an XR
box. It appears that IOS XR behaves in the same manner as Force10, and JunOS,
whereby the session is not torn down, and the path is installed, albeit with a
munged AS_PATH. The output below is for the prefix from 196629 which we
Path #1: Received by speaker 0
3356 35320 3.21 23456
Given that XR box is an AS4-speaker, one would not expect to see 23456 in the
AS_PATH, the prescence of this AS seems to be a symptom of the bug (and again
occurs on Juniper/Force10).
Rob Shakir <rjs () eng gxn net>
Network Development Engineer GX Networks/Vialtus Solutions
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