From: Liban.Mohamed@mail.sprint.com
Date: Sun Oct 20 2002 - 16:47:27 GMT-3
The dynamic inbound soft reset capability was added to
Cisco's BGP support in Cisco IOS Software Release
12.0(6)T. BGP Soft Reset Enhancement is supported on
most Cisco router platforms up through the Cisco 7500
Series routers. Soft resets can be initiated without extra
commands using only the clear ip bgp in command.
Basically soft reconfiguration is to gracefully allow policies to be
configured and activated without "hardsetting" the bgp session. There
are
two kinds. Outbound and inbound. For inbound, all recieved routes are
stored
regardless of the fact whether they are accepted or denied. When we
clear
bgp with soft in, the polices are applied on the stored received path.
When we do clear bgp soft out, all entries in bgp table are re-run and
new
updates are generated to be sent out.
syntax:
1. sh ip bgp neighbor <peer address> received-routes
This displays all the received updates from neighbor
2. neighbor <address> soft-reconfiguration <in>
This will start storing the received updates. So required for INBOUND
soft
reconfig. Outbound reconfig does not need anything to be configured.
Thanks,
Liban Mohamed
IP Engineer
Sprintlink Internet BackBone
www.sprint.net
-----Original Message-----
From: rich [mailto:rich@myhomemail.net]
Sent: Sunday, October 20, 2002 2:56 PM
To: ccielab
Cc: rich
Subject: bgp soft-reconfig in?
Is it true, when the neighbors support;
Neighbor capabilities: (taken from sho ip bgp neighbor)
Route refresh: advertised and received
Address family IPv4 Unicast: advertised and received
that you don't need to use the neighbor x.x.x.x soft-reconfiguration
inbound command? I have not used this command once. After making a
change to my bgp I just do a clear ip bgp XX sof.
Rich
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