From: Kurt Kruegel (kurt@cybernex.net)
Date: Sun Nov 23 2003 - 22:44:48 GMT-3
so ....
will
clear ip bgp in
force a route refresh ???
----- Original Message -----
From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
To: <Ken.Farrington@barclayscapital.com>; <ccielab@groupstudy.com>
Sent: Sunday, November 23, 2003 8:21 PM
Subject: RE: BGP Soft Reset (BGP RIB)
> Ken,
>
> "Soft-reconfiguration" is Cisco's old proprietary way of
> allowing changes in the BGP policy without tearing down the TCP session
> and rebuilding it. "Route-refresh" is the standard and preferred method
> to do so.
>
> Soft-reconfiguration must be preconfigured with the 'neighbor
> x.x.x.x soft-reconfiguration inbound' bgp subcommand. With
> soft-reconfig, the router caches prefixes received from a neighbor, then
> installs a separate copy which is a result of configured inbound
> filters. The original copy can be seen by issuing the 'show ip bgp nei
> x.x.x.x received-routes' command. Using this method is not recommended,
> because the memory required on a per neighbor basis can be effectively
> doubled.
>
> Unlike soft-reconfig, route-refresh does not need to keep two
> copies of the BGP table. There is no way to see the unmodified received
> table other than going to the upstream side and doing a 'sh ip bgp nei
> x.x.x.x advertised'. Route-refresh is part of the BGP capabilities
> exchange, and does not require any additional configuration.
>
>
> HTH,
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 708-362-1418 (Outside the US and Canada)
>
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of Bob Sinclair
> > Sent: Sunday, November 23, 2003 5:05 PM
> > To: Ken.Farrington@barclayscapital.com; ccielab@groupstudy.com
> > Subject: Re: BGP Soft Reset (BGP RIB)
> >
> >
> > Ken,
> >
> > The soft-reconfiguration inbound command is required if you
> > want to issue a
> > "neighbor received-routes" command. The received routes
> > command will show
> > you what the neighbor is sending you BEFORE any inbound
> > policies are applied. Very helpful!
> >
> > HTH,
> >
> > -Bob Sinclair
> > CCIE #10427, CISSP, MCSE
> > bsinclair@netmasterclass.net
> >
> > ----- Original Message -----
> > From: <Ken.Farrington@barclayscapital.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Sunday, November 23, 2003 5:05 PM
> > Subject: BGP Soft Reset (BGP RIB)
> >
> >
> > > Guys,
> > >
> > > Please can I confirm that nowadays you do not have to use the "
> > > neighbor 200.200.1.1 soft-reconfiguration inbound" command.
> > >
> > > All my routers without this command have the route-refresh
> > capability
> > > on (please see output below), and as such and I can do a
> > >
> > > "cle ip bgp 200.200.1.1 soft in" or "cle ip bgp
> > 200.200.1.1 in"
> > >
> > > without configuring soft-reconfiguration under the BGP process.
> > >
> > >
> > > Also, I assume the router stores two copies of the RIB, one
> > > unmodified
> > and
> > > one modified with inbound policies. If this is correct, is there a
> > > way of showing the unmodified RIB ?
> > >
> > >
> > > TEST2#sh ip bgp nei 200.200.1.1
> > > BGP neighbor is 200.200.1.1, remote AS 6500, external link
> > > BGP version 4, remote router ID 155.195.16.161
> > > BGP state = Established, up for 00:06:48
> > > Last read 00:00:48, hold time is 180, keepalive interval
> > is 60 seconds
> > > Neighbor capabilities:
> > > Route refresh: advertised and received(new)
> > > <======================Please Note
> > > Address family IPv4 Unicast: advertised and received
> > > Received 1481 messages, 936 notifications, 0 in queue
> > > Sent 1537 messages, 0 notifications, 0 in queue
> > > Route refresh request: received 0, sent 6
> > > Default minimum time between advertisement runs is 30 seconds
> > >
> > >
> > >
> > >
> > >
> > >
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