From: Brian Hescock (bhescock@xxxxxxxxx)
Date: Sat Dec 30 2000 - 20:39:22 GMT-3
the lab environment shouldn't be a problem since it's usually a factor of
how many routes you have, it keeps a separate table for soft
reconfiguration (so if you have 90,000 routes, you now need enough memory
for 180,000 routes). Basically, it's a copy of every route you learned
from that neighbor(s) without any filtering applied, etc. My
understanding is if you clear bgp soft reconfig in it flushes all of the
routes and rereads them back in from the soft reconfig table and apply
whatever the current filters are, etc, then put the results in your bgp
table / routing table as appropriate.
The only time you wouldn't really want to use it is in a production
network where you're low on memory in that router.
Brian
On Sat, 30 Dec 2000, ChrisH wrote:
> How much memory is enough in the Lab environment?
>
> Chris
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Brian Hescock
> Sent: Saturday, December 30, 2000 6:09 PM
> To: ChrisH
> Cc: Connary, Julie Ann; ccielab@groupstudy.com
> Subject: RE: propagating routes in bgp
>
>
> Almost. You don't have to clear the bgp neighbor if you've configured bgp
> "soft reconfiguration". clear bgp soft reconfiguration (in or out as
> appropriate) and it will make the change take effect without clearing your
> bgp neighbors. This is a significant timesaver in the lab. The only time
> you really wouldn't want to use it is if you don't have enought memory.
>
> Brian
>
> On Sat, 30 Dec 2000, ChrisH wrote:
>
> > You will have to reset the BGP sessions every time you make changes. Here
> is
> > what the doc says:
> >
> > "Once you have defined two routers to be BGP neighbors, they will form a
> BGP
> > connection and exchange routing information. If you subsequently change a
> > BGP filter, weight, distance, version, or timer, or make a similar
> > configuration change, you must reset BGP connections for the configuration
> > change to take effect"
> > Here is the URL for more details:
> >
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c
> > /ipcprt2/1cdbgp.htm#xtocid1599
> >
> > Chris
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Connary, Julie Ann
> > Sent: Friday, December 29, 2000 2:51 PM
> > To: ccielab@groupstudy.com
> > Subject: propagating routes in bgp
> >
> >
> > Hi,
> >
> > I'm working with BGP and I noticed that if I inject new routes into BGP -
> > say putting in a static route and network
> > statement that they do not get propagated to neighbors until I do a clear
> > ip bgp * (or the specific neighbor.)
> >
> > Why is that? Does BGP not send updates when it has a new route in it's
> > table that it has not sent to a peer if it is eligible
> > to be sent to that peer? Or am I being too impatient and it takes a while
> > before those automatic updates occur? I've also
> > noticed the same when trying to do filtering or removing a route by
> > removing the network statement. I always have to
> > clear ip bgp *. I understood I only needed to do that if I was changing
> > attributes or metrics.
> >
> > Thanks,
> >
> > Julie Ann
> > ------------------------------------------------------------------------
> > Julie Ann Connary
> > | | Network Consulting Engineer
> > ||| ||| Federal Support Program
> > .|||||. .|||||. 13635 Dulles Technology Drive,
> > Herndon VA 20171
> > .:|||||||||:.:|||||||||:. Pager: 1-888-642-0551
> > c i s c o S y s t e m s Email: jconnary@cisco.com
> >
> > ------------------------------------------------------------------------
> >
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