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[isp-bgp] RE: Discontiguous AS
There the hacks you mentioned, or the Allow-as command to overcome the loop avoidance "feature". Really, the best way (assuming there is no plan to interconnect the networks in the future) is to go with a seperate AS.
Question to all. If you use allow-as, and pass the routes from your remote site to your downstream customers, Does BGP trigger a Malformed AS_PATH error because because the AS path has the same AS in it non-contiguously? RFC 1771 makes note of a syntax check of the AS Path but is not specific about this.
-Ejay
-----Original Message-----
From: Greenhalgh, John [mailto:JGreenhalgh@...Sent: Wednesday, April 02, 2003 4:23 AM
To: isp-bgp@isp-bgp.com
Subject: [isp-bgp] Discontiguous AS
Hi,
We currently have a single AS and we are starting a new network other side
of the States. The two networks will be discontiguous. Both networks will be
multi-homed to Tier 1 providers and we must support BGP to customers.
Any ideas of how we can support two discontiguous ASs but still using the
same AS number. We foresee the problem where loop avoidance mechanisms will
stop the ASs learning each other's routes.
Ideas so far are to use statics at our network egress, or to tunnel sessions
between the two networks, both of which seem messy.
Has anyone got any ideas how we can do this without 'bodging' it?
John
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- [isp-bgp] RE: Discontiguous AS, Iljitsch van Beijnum
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