I tried in my lab with two boxes
28xx-76xx
28xx is running 12.4(15)T9
76xx is running 12.2(33)SRB6
eBGP between the boxes.
I changed the route-id manually on 28xx
2800#sh ip bgp sum
BGP router identifier 10.10.10.1, local AS number 1020
BGP table version is 1, main routing table version 1
NeighborVAS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
2.2.2.2 4 1021 14 16100 00:01:460
10.10.10.2 4 1021 14 16100 00:01:340
2800#
2800#
2800#sh run | s bgp
router bgp 1020
no synchronization
bgp router-id 10.10.10.1
bgp log-neighbor-changes
neighbor 2.2.2.2 remote-as 1021
neighbor 2.2.2.2 ebgp-multihop 10
neighbor 2.2.2.2 update-source Loopback0
neighbor 10.10.10.2 remote-as 1021
no auto-summary
2800#
2800#conf t
Enter configuration commands, one per line. End with CNTL/Z.
2800(config)#
2800(config)#router bgp 1020
2800(config-router)#bgp rout
2800(config-router)#bgp router-id 1.1.1.1
2800(config-router)#end
2800#
*Jul 15 14:11:21.199 EST: %BGP-5-ADJCHANGE: neighbor 2.2.2.2 Down Router
ID changed
*Jul 15 14:11:21.199 EST: %BGP-5-ADJCHANGE: neighbor 10.10.10.2 Down
Router ID changed
*Jul 15 14:11:21.211 EST: %SYS-5-CONFIG_I: Configured from console by
console
*Jul 15 14:11:21.239 EST: %BGP-5-ADJCHANGE: neighbor 2.2.2.2 Up
*Jul 15 14:11:21.251 EST: %BGP-5-ADJCHANGE: neighbor 10.10.10.2 Up
2800#
0#
2800#sh ip bgp sum
BGP router identifier 1.1.1.1, local AS number 1020
BGP table version is 1, main routing table version 1
NeighborVAS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
2.2.2.2 4 1021 17 21100 00:00:280
10.10.10.2 4 1021 17 21100 00:00:280
2800#
I then tried in on 7600
7600#sh ip bgp sum
Load for five secs: 0%/0%; one minute: 3%; five minutes: 2%
Time source is hardware calendar, *18:13:06.279 EST Wed Jul 15 2009
BGP router identifier 10.10.10.2, local AS number 1021
BGP table version is 1, main routing table version 1
NeighborVAS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
1.1.1.1 4 1020 4 3100 00:00:060
10.10.10.1 4 1020 4 3100 00:00:060
7600#
7600#
7600#sh run | b router bgp
router bgp 1021
no synchronization
bgp router-id 10.10.10.2
bgp log-neighbor-changes
neighbor 1.1.1.1 remote-as 1020
neighbor 1.1.1.1 ebgp-multihop 10
neighbor 1.1.1.1 update-source Loopback0
neighbor 10.10.10.1 remote-as 1020
no auto-summary
!
7600#conf t
Enter configuration commands, one per line. End with CNTL/Z.
7600(config)#router bgp 1021
7600(config-router)#bgp route
7600(config-router)#bgp router-id 2.2.2.2
7600(config-router)#end
7600#
*Jul 15 18:13:34.819: %BGP-5-ADJCHANGE: neighbor 1.1.1.1 Down Router ID
changed
*Jul 15 18:13:34.819: %BGP-5-ADJCHANGE: neighbor 10.10.10.1 Down Router
ID changed
*Jul 15 18:13:35.475: %SYS-5-CONFIG_I: Configured from console by console
7600#
7600#
7600#
*Jul 15 18:13:50.159: %BGP-5-ADJCHANGE: neighbor 10.10.10.1 Up
7600#
*Jul 15 18:13:53.287: %BGP-5-ADJCHANGE: neighbor 1.1.1.1 Up
7600#
7600#sh ip bgp sum
Load for five secs: 1%/0%; one minute: 2%; five minutes: 2%
Time source is hardware calendar, *18:13:57.819 EST Wed Jul 15 2009
BGP router identifier 2.2.2.2, local AS number 1021
BGP table version is 1, main routing table version 1
NeighborVAS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
1.1.1.1 4 1020 4 3100 00:00:040
10.10.10.1 4 1020 4 3100 00:00:070
7600#
Hope that helps.
Shimol
Jeff Cartier wrote:
Just checking something that I haven't been able to verify online...
Changing the bgp router-id manually will require you to clear the bgp
sessions? Correct?
Thanks!!!
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