From: Mas Kato (tealp729@xxxxxxxx)
Date: Sun May 20 2001 - 17:53:23 GMT-3
No problem, Mark. I think I see your point of distinction now.
>From RFC-1771:
3.2a) Adj-RIBs-In: The Adj-RIBs-In store routing information that has
been learned from inbound UPDATE messages. Their contents represent
routes that are available as an input to the Decision Process.
It looks like you've illustrated how to display what represents each
sentence in the above paragraph separately. 'show ip bgp nei x.x.x.x
received' displays the raw UPDATE from that neighbor (if from an IBGP
neighbor, attributes such as local preference could already be set),
while 'show ip bgp' displays the routes as they are ready for the
multi-step Decision Process for installation into the Loc-RIB (perhaps
after local attribute manipulation has been performed).
Does that sound about right?
Thanks,
Mas
-----Original Message-----
From: mcaplan.cs@clearstream.com [mailto:mcaplan.cs@clearstream.com]
Sent: Sunday, May 20, 2001 4:14 AM
To: tealp729@home.com; ccielab@groupstudy.com
Subject: RE: Reconciling Cisco BGP with the RFC
Mas,
Sorry for the delay on this one. I agree with you that the Loc_RIB
referred
to in the RFC is the same as 'sh ip route bgp'.
I'm not too sure about RIB-in though. I think RIB-in is only showed by
'show
ip bgp nei x.x.x.x received'.
'Show ip bgp' shows routes after they have have had the local policy
applied
eg changes to local preference.
eg look at this example
show ip bgp ne 192.68.5.2 received-routes
Network Next Hop Metric LocPrf Weight Path
* 192.68.10.0 192.68.5.2 0 0 2 i
But look what the BGP table shows, after local policy has been applied;
the
local preference has been incremented.
show ip bgp
*> 192.68.10.0 192.68.5.2 0 300 0 2 i
So the BGP table 'sh ip bgp' is a list of candidate routes for the IP
routing table after the normal BGP rules have been applied eg check NEXT
HOP
exists, only install the best route based on Local Pref etc.
Thanks for your feed back
Mark
> ----------
> From: Mas Kato[SMTP:tealp729@home.com]
> Sent: Montag, 14. Mai 2001 18:17
> To: mcaplan.cs@clearstream.com; ccielab@groupstudy.com
> Subject: RE: Reconciling Cisco BGP with the RFC
>
> Hello,
>
> The local-RIB is the actual routing table - 'show ip route bgp,'
whereas
> 'show ip bgp' will display the inbound announcements from all of the
> neighbors (RIB-in). Displaying the RIB-out is as you stated.
>
> Regards,
>
> Mas Kato
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> mcaplan.cs@clearstream.com
> Sent: Monday, May 14, 2001 2:05 AM
> To: ccielab@groupstudy.com
> Subject: Reconciling Cisco BGP with the RFC
>
>
> Hi,
>
> I've been reading the BGP RFC 1771 and wonder if someone could help me
> reconcile it with Cisco's implementation.
>
> The RFC talks about 3 RIBs.
>
> Adj-RIB-In
> Loc-RIB
> Adj-RIB-out
>
> Can someone confirm that the Loc-RIB is the BGP table shown via "sh
ip
> bgp", that the Adj-RIB-in is the table shown via "sh ip bgp ne x.x.x.x
> received-routes" and that the Adj-RIB-out is the table shown via "sh
ip
> bgp
> ne x.x.x.x advertised-routes".
>
> I've checked through Halabi and the groupstudy archive, but cant find
> anything to confirm/deny.
>
> Thanks
>
> Mark
>
>
>
>
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