From: James (james@towardex.com)
Date: Sat Jul 24 2004 - 15:06:20 GMT-3
On Sat, Jul 24, 2004 at 10:49:26AM +0400, Daniel Ginsburg wrote:
> On Thu, Jul 22, 2004 at 05:10:03PM -0400, James wrote:
> > Also note that 'soft-reconfiguration inbound' is no longer
> > necessary when you use routers that support Route Refresh
> > capability (most routers today do. chances are your IOS
> > version also does). With full internet routing table,
> > 'soft-recon inbo' will waste a good chunk of RAM on your
> > router for its usefulness that is already covered by
> > route refresh.
> >
>
> True. Route Refresh obviates need of 'soft-reconfiguration inbound' to
> reconfigure BGP settings with dropping BGP session. But still
> 'soft-reconfiguration inbound' is useful for debugging inbound filters. It
> will let you see routes filtered by inbound filter, which is very useful
> if you wonder where did you routes go.
'soft-recon in' will let you see the pure Adj-RIB-in before inbound policies
are activated upon. So what you see in 'soft-reconfiguration inbound' is not
what you see in 'sh ip bgp' when you have filters and policies.
It is a good feature if you want to see what prefixes your peer is exactly
sending you before you filter them off (for example, as you say, it will be
a good troubleshooting tool to have it configured on some customer bgp
sessions). However if you want to see what routes have been filtered (i.e.
see what routes have been filtered by your inbound filter per neighbor
basis), then there is no need for soft-recon, as you can simply type
'sh ip bgp neighbor a.b.c.d routes' to see the prefixes received from
remote neighbor after your filtering and policies have been applied. :)
-J
-- James Jun TowardEX Technologies, Inc. Technical Lead Network Design, Consulting, IT Outsourcing james@towardex.com Boston-based Colocation & Bandwidth Services cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
This archive was generated by hypermail 2.1.4 : Sun Aug 01 2004 - 10:12:02 GMT-3