From: Horszczaruk Krzysztof (Krzysztof.Horszczaruk@xxxxxxxxxxxxx)
Date: Tue Jul 09 2002 - 07:14:22 GMT-3
please understand, that "neighbor x.x.x.x soft-reconfiguration" creates local b
uffer.
data in this buffer can not reflect otbound policy changes made on remote peer,
unless you clear remote peer.
more you can read at: http://www.cisco.com/univercd/cc/td/doc/product/software/
ios120/120newft/120t/120t7/sftrst.htm
regards - kh.
>>>-----Original Message-----
>>>From: Hunt Lee [mailto:huntl@webcentral.com.au]
>>>Sent: Tuesday, July 09, 2002 11:58 AM
>>>To: Horszczaruk Krzysztof
>>>Cc: ccielab@groupstudy.com
>>>Subject: RE: Quick Question.... - more help!!!
>>>
>>>
>>>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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