From: Brian McGahan (brian@cyscoexpert.com)
Date: Sun Oct 20 2002 - 18:13:04 GMT-3
Soft-reconfig and route-refresh are two different technologies.
They both accomplish pretty much the same thing, however they are
implemented differently.
http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_configur
ation_guide_chapter09186a00800d97fc.html#xtocid9
Route-refresh is preferable over soft-reconfig, since there is
no additional configuration required, and it does not require any
additional memory resources. Soft-reconfig inbound can be dangerous to
use on a production BGP router, since inbound updates must be first
cached, attributes applied, then flushed from memory. This means that
if your router is short on memory, it could crash.
For those of you with access to the Partner E-Learning
connection, check out this link on multiprotocol extensions for BGP. It
gives a good overview of route-refresh and ORF.
http://cisco.partnerelearning.com/pec/trnevtdtl.asp?EvtID=39137
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
Voice: 847.674.3392
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Liban.Mohamed@mail.sprint.com
> Sent: Sunday, October 20, 2002 2:47 PM
> To: ccielab@groupstudy.com; rich@myhomemail.net
> Subject: RE: bgp soft-reconfig in?
>
> 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
This archive was generated by hypermail 2.1.4 : Tue Nov 05 2002 - 08:35:52 GMT-3