From: David Luu (wicked01@xxxxxxxxxxxxx)
Date: Tue Jul 09 2002 - 13:40:19 GMT-3
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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