From: Peng Zheng (zpnist@yahoo.com)
Date: Mon Apr 07 2003 - 12:54:39 GMT-3
Thanks for help.
--- OhioHondo <ohiohondo@columbus.rr.com> wrote:
> Peng
>
> BGP Synchronization with OSPF
>
> If you are using BGP and OSPF the router must
> successfully match up the BGP
> learned route with the IGP learned route for a route
> to be synchronized.
>
> On a given router, if that router learns a prefix
> via EBGP and the EBGP
> route is installed in the IP routing table, any
> identical iBGP prefix
> learned WILL NOT be synchronized!!! The OSPF (IGP)
> route is not in the
> routing table (because the EBGP route has an admin
> of 20) so it can't be
> synchronized with the iBGP learned route.
>
> If you disable the EBGP peering connection and reset
> the BGP process on the
> router an OSPF route should show up in the IP
> routing table. If the OSPF
> router ID of the router SENDING the OSPF route
> matches the BGP router ID of
> the iBGP peer sending the route --- you will be
> synchronized.
>
> Note -- if you have 2 iBGP peers sending this route
> to your router, only one
> of them has the possibility to synchronize. The Best
> Route identified by the
> BGP process on your router must have come from the
> same OSPF router that is
> the source of the OSPF update in the routing table
> --- that is to say that
> the OSPF router ID at the source of the
> advertisement has to equal the BGP
> router ID.
>
> I have read that Cisco does not recommend using
> synchronization in a full
> mesh or simulated full mesh environment. They also
> do not recommend using it
> if your AS is not a transit AS.
>
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> Peng Zheng
> Sent: Sunday, April 06, 2003 7:16 PM
> To: ccielab@groupstudy.com
> Subject: BGP synchronize
>
>
> Hi,
>
> Routing TCPIP V2, on top of page 189. For each of
> 192.168.192.0 to 192.168.199.0, Sugarbush learn them
> from Stowe (EBGP) and Diamond (IBGP), I use
>
> For Sugarbush and Diamond, I use neighbor
> next-hop-self on for each other.
>
> For IBGP learned route, they are not synchronized.
> What I want to do is to synchronize them. Then I
> config ospf on the link between Sugarbush and
> Diamond.
> and redistribute bgp 200 subnet into ospf, but
> routes
> learned from IBGP are not synchronized. But if I
> shutdown the EBGP link ( for example, for Sugarbush,
> I
> shutdown the link between Stowe and Sugarbush),
> those
> routes are synchronized.
>
>
> Does anyone know why?
>
> Thank you for help.
>
>
>
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This archive was generated by hypermail 2.1.4 : Thu May 01 2003 - 13:35:48 GMT-3