12-02-2008 11:23 PM - edited 03-04-2019 12:34 AM
hello friends,
please tell me, if i use same bgp AS number for all branch locations then what will be routing issues, i will get?
12-03-2008 12:50 AM
Hi,
it's not clear what you mean.
Establishing one AS and running iBGP between all your sites?
Or running a (provider) MPLS backbone with the same AS number assigned to all sites?
(In this case neighbor allowas-in would help, see http://www.cisco.com/en/US/docs/ios/12_0t/12_0t7/feature/guide/VPN_EN.html#wp1045854)
BR,
Milan
12-03-2008 01:35 AM
Hello Sourabh,
just a little add to Milan's post:
if you use a Service Provider MPLS L3 VPN this is not an issue: the service provider network can perform AS override of the private AS (64512-65535 range) that it has given to your company.
If you use iBGP and you own your own WAN infrastructure (or you have bought a L2 service) this is not a problem too but you may need to deploy BGP Route Reflector in order to have the routes to propagate in all the domain without using a full mesh of iBGP sessions.
Hope to help
Giuseppe
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