bgp feed to customer

William Herrin bill at
Mon Jun 13 19:34:23 UTC 2011

On Mon, Jun 13, 2011 at 1:25 PM, Richard Zheng <rzheng at> wrote:
> This is probably a typical setup for border router not speaking BGP, wonder
> how to handle it properly. Border router B is connected with customer router
> C. Router C wants default-only/partial/full routes. Router B can't or is not
> willing to handle it. Router C has a multihop EBGP session with a backbone
> router A. To get router B know the customer routes, router A redistributes
> them from EBGP to OSPF.
> The issue is redistribution from EBGP to OSPF works half way. OSPF database
> has the external routes, but forwarding address is set to Router A. So the
> routing loop occurs between A and B.
> I wonder if it is a design issue or configuration issue?
>  ----------                  --------------                 ------------
> | BGP rtr A |  ============ | no-BGP rtr B |  ============ | Customer C |
>  ----------                  --------------                 ------------

Hi Richard,

Just a SWAG, but run IBGP on router B with just your internal routes
(including the customer route) instead of exporting into OSPF?

Bill Herrin

William D. Herrin ................ herrin at  bill at
3005 Crane Dr. ...................... Web: <>
Falls Church, VA 22042-3004

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