From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Mon Nov 24 2003 - 15:50:15 GMT-3
Kurt,
If route-refresh is supported then both 'clear ip bgp * in' and
'clear ip bgp * soft in' will do route-refresh. If route-refresh is not
supported and soft-reconfiguration is not configured you will get the
following error message:
router#clear ip bgp 172.16.4.3 in
%BGP: Inbound soft reconfig for 172.16.4.3 not possible as it
has neither refresh capability, nor inbound soft reconfig
router#clear ip bgp 172.16.4.3 soft in
%BGP: Inbound soft reconfig for 172.16.4.3 not possible as it
has neither refresh capability, nor inbound soft reconfig
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: Kurt Kruegel [mailto:kurt@cybernex.net]
> Sent: Sunday, November 23, 2003 7:45 PM
> To: Brian McGahan; Ken.Farrington@barclayscapital.com;
> ccielab@groupstudy.com
> Subject: Re: BGP Soft Reset (BGP RIB)
>
>
> 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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