Re: Interesting BGP/EIGRP interaction

From: Shawn Zandi (szmetal@gmail.com)
Date: Sun Jul 06 2008 - 07:40:53 ART

Joe,
Definitely it use IP routing table not BGP table, for redistribution fpr the
sake of "AD",
I don't see any problem here, before "Redistribution" maybe you have those
routes as "BGP" entries in your routing table, EIGRP using Static-to-Null,
is just over-writing those routes in your routing table with D instead of B
cause static AD is preferred (If I understood the situation correctly...)
whats your routing table before redistribution? 

-- 
Sincerely,
Shawn Zandi
Routing, Switching & Security Consultant
CCIE (Routing & Switching) - MCSE

eLINEAR SOLUTIONS ME FZ LLC
Dubai Internet City - Building 13
web: http://www.shafagh.com
email: shafagh@shafagh.com
Fax: +971 4 390 8548

On Sun, Jul 6, 2008 at 1:02 PM, Joseph Brunner <joe@affirmedsystems.com>
wrote:

> Right, but the redistribute command is supposed to take routes from the IP
> routing table
>
>
>
> see
>
> http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_pi1.html#w
> p1015390<http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_pi1.html#wp1015390>
>
>
>
> Where the doc cd states "The following example configures BGP routes to be
> redistributed"
>
> Wouldn't bgp ROUTES mean ROUTES known via BGP in the current IP routing
> table (FIB)
>
> not just any information (including rib failures) in the bgp table.
>
>
>
> Tony Li/Yakhov Rekhter where are you when we need you!
>
>
>
> Thanks,
>
>
>
> Joe
>
>  _____
>
> From: Luan Nguyen [mailto:luan.m.nguyen@gmail.com]
> Sent: Sunday, July 06, 2008 1:05 AM
> To: Joseph Brunner
> Cc: Cisco certification
> Subject: Re: Interesting BGP/EIGRP interaction
>
>
>
> Joe,
> After researching, that is the correct behavior.  BGP local-rib is used to
> export routes.  The routing table is the forward information base, which
> routes are installed using best-path algorithm.
> Routing Protocols----->Import Policies--->Route Information Base
> (RIB)--->export policies---->routing protocols
>
> |
>                                                                    Route
> Selection
>                                                         Forwarding
> Information Base (FIB)
>
> For example, when you have a rib-failure that means the FIB has a better
> route then the route come from BGP local-rib.
>
> -Luan

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