Re: [isp-bgp] Cisco 3560 question

[Pete Templin <petelists@...>]

NOC Meganet wrote:
> On Thursday 16 August 2007 15:06:30 Ton S wrote:
> > Question is: How often do you use "soft reconfiguration" ?
> there was something like that in old IOS before 12.0 I guess but today with 
> neigbour *** soft-reconfiguration [inbound]
>
> you do not use such command (issuing it) anymore and you do not have any extra 
> memory in use because the rt table update is iniciated by the neighbour who 
> has new routes
Don't make such blanket statements.  Yes, you can turn off soft-reconfig 
and re-suck the neighbor's routes by simply doing "clear ip bgp x.x.x.x 
in" - it signals the neighbor to do a 'clear...out' and you can run all 
of the neighbor's routes through your new policy.

However, soft-reconfig does have its benefits, strong enough that I 
still use it unless I'm taking a full table on a memory-constrained 
router.  If I do 'sh ip bgp x.x.x.x/y', I see the paths that FAILED the 
policy, as they're marked (received-only).  I also get to see the route 
BEFORE any policy modifications (local pref, weight, prepends, MED 
adjustments, etc.).  Given the mixed BGP skills of many of my customers, 
having this troubleshooting tool is VERY beneficial:

Customer: "Why aren't you accepting my route <blah>?"
Me: Hmmm...(log in, 'sh ip b x.x.x.x/y')...have you checked 'sh ip b n 
x.x.x.x adv' to see if you're sending it to me?
Customer: "Of course I have!"
Me: Check again, it's not in my list of received routes from you, so you 
probably have a route map problem.
Customer: "You're right...<clickety clickety>...I'll get back to you."

('sh ip b n x.x.x.x received-routes' is also beneficial if multiple 
prefixes are in question.)

pt





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