Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

same bgp AS number at all brach locations

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?

2 REPLIES

Re: same bgp AS number at all brach locations

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

Hall of Fame Super Silver

Re: same bgp AS number at all brach locations

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

125
Views
5
Helpful
2
Replies