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Any one can answer the BGP Synchronization question ?
Posted on 2012-12-29
Any one can answer the BGP Synchronization question ?
The topology is very simple. Router2---Router1--interfa
R1
router bgp 12
network 111.1.1.0 mask 255.255.255.0
neighbor 2.2.2.2 remote-as 12
neighbor 2.2.2.2 update-source Loopback0
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
R2
router bgp 12
synchronization
neighbor 1.1.1.1 remote-as 12
neighbor 1.1.1.1 update-source Loopback0
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
R2#show ip bgp
Network Next Hop Metric LocPrf Weight Path
* i111.1.1.0/24 1.1.1.1 0 100 0 i
After R2 enabled synchronization, the network 111.1.1.0/24 in bgp table lost marker “>” in the bgp table.
Question:
In the case, synchronization rule means network 111.1.1.0/24 is inactive (meaning losing marker “>” ) in R2’ BGP table until this network goes into R2 via IGP. Now the network 111.1.1.0/24 already has gone into R2 via IGP. Why does the network 111.1.1.0/24 is still inactive in R2 BGP table after enabling synchronization in R2 ?
The topology is very simple. Router2---Router1--interfa
R1
router bgp 12
network 111.1.1.0 mask 255.255.255.0
neighbor 2.2.2.2 remote-as 12
neighbor 2.2.2.2 update-source Loopback0
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
R2
router bgp 12
synchronization
neighbor 1.1.1.1 remote-as 12
neighbor 1.1.1.1 update-source Loopback0
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
R2#show ip bgp
Network Next Hop Metric LocPrf Weight Path
* i111.1.1.0/24 1.1.1.1 0 100 0 i
After R2 enabled synchronization, the network 111.1.1.0/24 in bgp table lost marker “>” in the bgp table.
Question:
In the case, synchronization rule means network 111.1.1.0/24 is inactive (meaning losing marker “>” ) in R2’ BGP table until this network goes into R2 via IGP. Now the network 111.1.1.0/24 already has gone into R2 via IGP. Why does the network 111.1.1.0/24 is still inactive in R2 BGP table after enabling synchronization in R2 ?
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4 Comments
Your topology isn't desirable to enable synchronization.
You can disable synchronization if one of the following conditions is true:
- Your AS does not pass traffic from one AS to another AS.
- All the transit routers in your AS run BGP.
You can disable synchronization if one of the following conditions is true:
- Your AS does not pass traffic from one AS to another AS.
- All the transit routers in your AS run BGP.
Thanks. No matter whether I connect other additional iBGP or EBGP router to Router2, or not, the effect should be the same. The network 111.1.1.0/24 must be active ( with marker ">") , and then it can travel to next EBGP. what i am concerned is why the network 111.1.1.0/24 is not active after enabling synchronization
You are speaking ibgp and ospf between R1 and R2.
What is result of "R2#show ip bgp x.x.x.x". It's "not synchronized"?
I got troubleshooting guide from iphelp
Refer Cisco Case Studies
Hope this help.
Regards
What is result of "R2#show ip bgp x.x.x.x". It's "not synchronized"?
I got troubleshooting guide from iphelp
Refer Cisco Case Studies
Hope this help.
Regards
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