From: Colin Barber (Colin.Barber@xxxxxxxxxxxxxx)
Date: Tue Jul 09 2002 - 14:13:16 GMT-3
soft-reconfiguration can be very useful to check your filtering is working
correctly as you can compare the routes receive both before and after your
filters have been applied.
show ip bgp neigh x.x.x.x received-routes
show ip bgp neigh x.x.x.x routes
Just remember that you need to store the extra set of routes in memory so if
you are receiving 10,000+ routes make sure your router can handle it.
Colin
-----Original Message-----
From: David Luu [mailto:wicked01@ix.netcom.com]
Sent: 09 July 2002 17:40
To: Hunt Lee; Horszczaruk Krzysztof
Cc: ccielab@groupstudy.com
Subject: RE: Quick Question.... - more help!!!
if the IOS on both routers support the route refresh capability, the
soft-reconfiguration is not needed
At 07:57 PM 7/9/2002 +1000, Hunt Lee wrote:
>It works if I do a clear ip bgp * soft out on RouterB :) However, even
>without the "neighbor x.x.x.x soft-reconfiguration" command on RouterA, it
>works too!!! (i.e. RouterA would be able to get the new MED from RouterB).
>So what's the point for the command???
>
>Hunt
>
>
>-----Original Message-----
>From: Horszczaruk Krzysztof [mailto:Krzysztof.Horszczaruk@getronics.com]
>Sent: Tuesday, July 09, 2002 6:23 PM
>To: Hunt Lee
>Subject: RE: Quick Question.... - more help!!!
>
>router B, because there you have made outgoing policy change
>so use clear soft out
>
>please let me know, if it works ;-)
>
> >>>-----Original Message-----
> >>>From: Hunt Lee [mailto:huntl@webcentral.com.au]
> >>>Sent: Tuesday, July 09, 2002 9:21 AM
> >>>To: Horszczaruk Krzysztof
> >>>Subject: RE: Quick Question.... - more help!!!
> >>>
> >>>
> >>>u mean on RouterA , or RouterB??
> >>>
> >>>-----Original Message-----
> >>>From: Horszczaruk Krzysztof
> >>>[mailto:Krzysztof.Horszczaruk@getronics.com]
> >>>Sent: Tuesday, 9 July 2002 5:19 PM
> >>>To: Hunt Lee
> >>>Subject: RE: Quick Question.... - more help!!!
> >>>
> >>>
> >>>try "clear soft out" on your neighbor
> >>>
> >>>>>>-----Original Message-----
> >>>>>>From: Hunt Lee [mailto:huntl@webcentral.com.au]
> >>>>>>Sent: Tuesday, July 09, 2002 9:13 AM
> >>>>>>To: 'Gyori Gabor'; Horszczaruk Krzysztof
> >>>>>>Cc: 'ccielab@groupstudy.com'
> >>>>>>Subject: Quick Question.... - more help!!!
> >>>>>>
> >>>>>>
> >>>>>>Hello guys,
> >>>>>>
> >>>>>>Thanks so much for the explanation. I managed the get
> >>>the 2nd method
> >>>>>>working with no problems (without "neighbor
> >>>>>>soft-reconfiguration" command).
> >>>>>>Just a minor question though, for the 1st method (by using
> >>>>>>the "neighbor
> >>>>>>x.x.x.x soft-reconfiguration inbound"), after I put that
> >>>>>>into RouterA, and
> >>>>>>make the outgoing route-map changes on RouterB, when I do
> >>>>>>the "clear ip bgp
> >>>>>>* soft in" on RouterA, it said that inbound soft
> >>>reconfiguration has
> >>>>>>started... but the new changes (with a higher MED) that i
> >>>>>>put in refused to
> >>>>>>change... unless if I do a hard BGP reset (by clear ip bgp *).
> >>>>>>
> >>>>>>Why is this?? Please help!!!
> >>>>>>
> >>>>>>Best Regards,
> >>>>>>Hunt Lee
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>RouterB#sh route-map
> >>>>>>
> >>>>>>route-map test, permit, sequence 10
> >>>>>>
> >>>>>> Match clauses:
> >>>>>>
> >>>>>> Set clauses:
> >>>>>>
> >>>>>> metric 203
> >>>>>>
> >>>>>> Policy routing matches: 0 packets, 0 bytes
> >>>>>>
> >>>>>>RouterB#
> >>>>>>
> >>>>>>
> >>>>>>RouterB#sh ip bgp n
> >>>>>>
> >>>>>>BGP neighbor is 10.1.1.1, remote AS 1, external link
> >>>>>>
> >>>>>>BGP version 4, remote router ID 10.3.0.1
> >>>>>>
> >>>>>>Password: BGP state = Established, up for 00:03:11
> >>>>>>Last read 00:00:09, hold time is 180, keepalive interval is
> >>>>>>60 seconds
> >>>>>>
> >>>>>>Neighbor capabilities:
> >>>>>>
> >>>>>> Route refresh: advertised and received(new)
> >>>>>>
> >>>>>> Address family IPv4 Unicast: advertised and received
> >>>>>>
> >>>>>> Received 48 messages, 0 notifications, 0 in queue
> >>>>>>
> >>>>>> Sent 50 messages, 0 notifications, 0 in queue
> >>>>>>
> >>>>>> Route refresh request: received 4, sent 0
> >>>>>>
> >>>>>> Default minimum time between advertisement runs is 30 seconds
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> For address family: IPv4 Unicast
> >>>>>>
> >>>>>> BGP table version 13, neighbor version 13
> >>>>>>
> >>>>>> Index 1, Offset 0, Mask 0x2
> >>>>>>
> >>>>>> Outbound path policy configured
> >>>>>>
> >>>>>> Route map for outgoing advertisements is test
> >>>>>>
> >>>>>> 2 accepted prefixes consume 72 bytes
> >>>>>>
> >>>>>> Prefix advertised 14, suppressed 0, withdrawn 0
> >>>>>>
> >>>>>> Number of NLRIs in the update sent: max 2, min 0
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> Connections established 3; dropped 2
> >>>>>>
> >>>>>> Last reset 00:03:54, due to Peer closed the session
> >>>>>>
> >>>>>> --More--
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>RouterA#sh ip bgp
> >>>>>>
> >>>>>>BGP table version is 5, local router ID is 10.3.0.1
> >>>>>>
> >>>>>>Status codes: s suppressed, d damped, h history, * valid,
> >>>> best, i -
> >>>>>>internal
> >>>>>>Origin codes: i - IGP, e - EGP, ? - incomplete
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> Network Next Hop Metric LocPrf Weight Path
> >>>>>>
> >>>>>>*> 10.2.0.0/16 0.0.0.0 0 32768 i
> >>>>>>
> >>>>>>*> 10.3.0.0/16 0.0.0.0 0 32768 i
> >>>>>>
> >>>>>>*> 20.1.0.0/16 10.1.1.2 203 0 2 i
> >>>>>>
> >>>>>>*> 20.2.0.0/16 10.1.1.2 203 0 2 i
> >>>>>>
> >>>>>>RouterA#
> >>>>>>
> >>>>>>
> >>>>>>And after I updated the outgoing route-map...
> >>>>>>
> >>>>>>RouterB#sh route
> >>>>>>
> >>>>>>route-map test, permit, sequence 10
> >>>>>>
> >>>>>> Match clauses:
> >>>>>>
> >>>>>> Set clauses:
> >>>>>>
> >>>>>> metric 1000
> >>>>>>
> >>>>>> Policy routing matches: 0 packets, 0 bytes
> >>>>>>
> >>>>>>RouterB#
> >>>>>>
> >>>>>>RouterA#clear ip bgp * soft in
> >>>>>>
> >>>>>>03:11:26: BGP(0): start inbound soft reconfiguration for 10.1.1.2
> >>>>>>
> >>>>>>03:11:26: BGP(0): process 20.1.0.0/16, next hop
> >>>>>>0.127.245.126, metric 203
> >>>>>>from 1
> >>>>>>0.1.1.2
> >>>>>>
> >>>>>>03:11:26: BGP(0): No inbound policy. Prefix 20.1.0.0/16 accepted
> >>>>>>unconditionally
> >>>>>>03:11:26: BGP(0): process 20.2.0.0/16, next hop
> >>>>>>0.127.245.86, metric 203
> >>>>>>from 10
> >>>>>>.1.1.2
> >>>>>>
> >>>>>>03:11:26: BGP(0): No inbound policy. Prefix 20.2.0.0/16 accepted
> >>>>>>unconditionally
> >>>>>>03:11:26: BGP(0): complete inbound soft reconfiguration,
> >>>ran for 20ms
> >>>>>>
> >>>>>>03:11:26: BGP(0): 10.1.1.2 computing updates, afi 0,
> >>>>>>neighbor version 5,
> >>>>>>table v
> >>>>>>ersion 7, starting at 0.0.0.0
> >>>>>>
> >>>>>>03:11:26: BGP(0): 10.1.1.2 update run completed, afi 0,
> >>>ran for 4ms,
> >>>>>>neighbor ve
> >>>>>>rsion 5, start version 7, throttled to 7
> >>>>>>
> >>>>>>RouterA#sh ip bgp
> >>>>>>
> >>>>>>BGP table version is 7, local router ID is 10.3.0.1
> >>>>>>
> >>>>>>Status codes: s suppressed, d damped, h history, * valid,
> >>>> best, i -
> >>>>>>internal
> >>>>>>Origin codes: i - IGP, e - EGP, ? - incomplete
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> Network Next Hop Metric LocPrf Weight Path
> >>>>>>
> >>>>>>*> 10.2.0.0/16 0.0.0.0 0 32768 i
> >>>>>>
> >>>>>>*> 10.3.0.0/16 0.0.0.0 0 32768 i
> >>>>>>
> >>>>>>*> 20.1.0.0/16 10.1.1.2 203 0 2 i
> >>>>>>
> >>>>>>*> 20.2.0.0/16 10.1.1.2 203 0 2 i
> >>>>>>
> >>>>>>RouterA#
> >>>>>>
> >>>>>>
> >>>>>>-----Original Message-----
> >>>>>>From: Gyori Gabor [mailto:Gabor.Gyori@lnx.hu]
> >>>>>>Sent: Monday, 8 July 2002 11:53 PM
> >>>>>>To: Horszczaruk Krzysztof; Harish DV/peakxv; Hunt Lee
> >>>>>>Cc: ccielab@groupstudy.com
> >>>>>>Subject: RE: Quick Question....
> >>>>>>
> >>>>>>
> >>>>>>Hi Krzysztof !
> >>>>>>
> >>>>>>You are absolutely right. I have tried the above second
> >>>>>>version (that you
> >>>>>>explained first) and it works explicitly as You described.
> >>>>>>The first one works with arbitrary peer router, the second
> >>>>>>need capable
> >>>>>>router
> >>>>>>(IOS 12.1 or above as doc say).
> >>>>>>
> >>>>>>Thanks for explanation,
> >>>>>>
> >>>>>>Gabor
> >>>>>>
> >>>>>>> -----Original Message-----
> >>>>>>> From: Horszczaruk Krzysztof
> >>>>>>> [mailto:Krzysztof.Horszczaruk@getronics.com]
> >>>>>>> Sent: Monday, July 08, 2002 3:31 PM
> >>>>>>> To: Gyuri Gabor; Harish DV/peakxv; Hunt Lee
> >>>>>>> Cc: ccielab@groupstudy.com
> >>>>>>> Subject: RE: Quick Question....
> >>>>>>>
> >>>>>>>
> >>>>>>> Hi Gyori Gabor,
> >>>>>>>
> >>>>>>> I think you are right and I am right too.
> >>>>>>>
> >>>>>>> in my understanding it works as follows:
> >>>>>>>
> >>>>>>> 1) when there is "neighbor soft-reconfiguration" configured
> >>>>>>> on your router, there is no request sent to the neighbor, and
> >>>>>>> all information is gathered from the local cache, buffer or
> >>>>>>> table (how to name it ?)
> >>>>>>>
> >>>>>>> 2) when there is no "neighbor soft-reconfiguration"
> >>>>>>> statement, then in case of "clear ip bgp * soft in" the route
> >>>>>>> refresh request is sent to the neighbor and information is
> >>>>>>> gatheret directly from the neighbor. of course it is possible
> >>>>>>> only if the neighbor support this feature.
> >>>>>>>
> >>>>>>> the simple analogy is browsing online/offline.
> >>>>>>>
> >>>>>>> cisco support it starting from 12.0. I do not know if it is
> >>>>>>> proprietary or not.
> >>>>>>> you can determine if your neighbor is route-refresh-capable
> >>>>>>> by "show ip bgp neighbors x.x.x.x"
> >>>>>>>
> >>>>>>> regards,
> >>>>>>> Krzysztof Horszczaruk
> >>>>>>> Senior Consultant, System Engineer
> >>>>>>> Network Integration
> >>>>>>>
> >>>>>>> Getronics Polska Sp. z o.o.
> >>>>>>> ul. Pulawska 352a
> >>>>>>> 02-819 Warszawa
> >>>>>>> http://www.getronics.com
> >>>>>>> http://www.getronics.pl
> >>>>>>>
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