02-19-2009 10:54 PM - edited 03-04-2019 03:39 AM
Hi,
One of my customer is facing strange issue.Total BW of the link is 20 Mbps 1:4,Customer is using full BGP route from service provider.Below is the config customer is having....As per customer BGP itself is taking 6 Mbps .....
router bgp 16838
no synchronization
bgp log-neighbor-changes
bgp dampening
network XX.XX.XX.XX mask 255.255.254.0
network XX.XX.XX.XX
network XX.XX.XX.XX
neighbor ibgp peer-group
neighbor ibgp remote-as 16838
neighbor ibgp update-source Loopback0
neighbor ibgp version 4
neighbor ibgp prefix-list default out
neighbor XX.XX.XX.XX remote-as 16838
neighbor XX.XX.XX.XX update-source Loopback0
neighbor XX.XX.XX.XX version 4
neighbor XX.XX.XX.XX peer-group ibgp
neighbor XX.XX.XX.XX default-originate
neighbor XX.XX.XX.XX peer-group ibgp
neighbor XX.XX.XX.XX default-originate
neighbor XX.XX.XX.XX remote-as 16838
neighbor XX.XX.XX.XX description Arbor
neighbor XX.XX.XX.XX password 7 012112560D4A1C3B2C
neighbor XX.XX.XX.XX update-source Loopback0
neighbor XX.XX.XX.XX remote-as 9498
neighbor XX.XX.XX.XX ebgp-multihop 255
neighbor XX.XX.XX.XX version 4
neighbor XX.XX.XX.XX route-map backup out
neighbor XX.XX.XX.XX filter-list 5 out
route-map backup permit 10
match ip address prefix-list corp
set as-path prepend 16838 16838 16838
!
route-map backup permit 20
!
route-map static-ospf permit 10
match ip address 175
!
route-map BRN1 permit 10
match ip address prefix-list VRSN
set as-path prepend 16838 16838 16838
We had given the suggestion to create route map to stop stop bgp
route-map NONE deny 10
router bgp xyz
neighbour xx.yy.zz.aa route-map NONE in neighbour xx.yy.zz.aa route-map NONE out
ujil
Solved! Go to Solution.
02-19-2009 11:22 PM
Hello Ujil,
modify the configuration on your side to send them only the default route and ask them to verify again BGP BW usage on the link.
A change on their side doesn't stop your router from sending routes to them on the session.
Their router can be out of memory and so it is not able to load all the BGP routes and the process of learning is never ending.
Other possible issues can be IOS dependent: some days ago someone by error sent out a too long AS path advertisement that caused BGP session to reset continously on routers with rather old ios.
See the thread about long AS paths
OR also before sending only the default route
Have th customer check with
sh ip bgp summary on their side:
the time the session is up the number of prefixes learned from you
from your side you can check with the same command if the session is stable or it is often reset.
Hope to help
Giuseppe
02-19-2009 11:22 PM
Hello Ujil,
modify the configuration on your side to send them only the default route and ask them to verify again BGP BW usage on the link.
A change on their side doesn't stop your router from sending routes to them on the session.
Their router can be out of memory and so it is not able to load all the BGP routes and the process of learning is never ending.
Other possible issues can be IOS dependent: some days ago someone by error sent out a too long AS path advertisement that caused BGP session to reset continously on routers with rather old ios.
See the thread about long AS paths
OR also before sending only the default route
Have th customer check with
sh ip bgp summary on their side:
the time the session is up the number of prefixes learned from you
from your side you can check with the same command if the session is stable or it is often reset.
Hope to help
Giuseppe
02-19-2009 11:32 PM
Hi Giuseppe ,
All are in Bridge ..discussing the same ..Will update you the status later..thanks for the quick responce ..
ujil
02-20-2009 02:38 AM
Hi Giuseppe,
the issue is now seems to be resolved there was some customer end issue the same got resolved when customer has change the config ...we hve requested customer customer to share the same.No changed done from Service provider end.
Thanks for the timly help
ujil
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