You are a film producer and parttime network engineer. You use BGP to connect two sites to each other but you feel things are a little slow. Let’s see if you can tune up some of those BGP timers.
- All IP addresses have been preconfigured for you.
- Configure EBGP between AS 1 and AS 2.
- The BGP scanner should run every 30 seconds on both routers.
- Ensure both routers don’t wait till the next BGP advertisement-interval but send updates immediately.
- When there is no activity after 15 seconds the BGP peering should be dropped.
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Configuration FilesYou need to register to download the GNS3 topology file. (Registration is free!)
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I changed advertisment interval to 1 second but when i do show ip bgp neig command i can still see Default minim advertisment interval of 30 second ? how can we verify that timer of advertisment is now set to 1?
I guess i figured out the answer myself
Kendrick#show ip bgp neighbors | include advertisement
Default minimum time between advertisement runs is 30 seconds
Minimum time between advertisement runs is 1 seconds
Good job that’s how we do it 🙂
Default Minimum time between advertisements for EBGP peers is 30 seconds and 5 seconds for IBGP peers
BGP Default San time is 60 Second.
i usually set my “bgp scan-time” to the minimum (5) when labbing.
for this lab, first set bgp timers from the bgp process then specifically at the bgp neighbor level.
Another good lab.
@faran I think the default ibgp advertisement minimum is 0 seconds, not 5.
For those going on to troubleshoot exam/lab try what I did and set the min hold time on one of the peers to something greater than the hold time on the other. For example:
scott(config-router)# neighbor 192.168.2.1 timers 30 60 40
Kendrick(config-router)# neighbor 192.168.2.2 timers 5 15 5
good bgp notification messages are our friends. 🙂
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