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Community Member

Strange BGP Issue

When we enable peering between the providers edge and our core switch, the peering establishes, the 3750G goes ito a black hole, hold timer expires and the 3750 is reachable.

All timers are default and should be negotiated be default.  We have verified L1 and L2 is operational.  I am seeing dropped unknown protocols on the Edge router (1500 or so).

Our setup is pretty simple

ProviderCLOUD ------------- Provider Edge Router (2801|12.4(19a)ADVIPSERV) ------------- 3750G (IPSRV 12.2.55SE4/K9)

3750G BGP config

router bgp 65AAA

no synchronization

bgp log-neighbor-changes

network 10.XXX.0.0 mask 255.255.0.0

redistribute connected

neighbor 10.XXX.10.10 remote-as 64BBB

no auto-summary

!

ip classless

ip route 0.0.0.0 0.0.0.0 10.xx.10.10 - default route safety valve while we are in implementation

ip route 10.0.0.0 255.0.0.0 10.xx.10.10 - same as above

ip route 10.xx.250.0 255.255.255.0 10.xx.0.10 - ISO network unrelated

Edge BGP Config

router bgp 64BBB

no synchronization

bgp log-neighbor-changes

network 10.40.0.0 mask 255.255.0.0

network 172.XXX.113.YYY mask 255.255.255.252

network 172.XXX.113.YYY mask 255.255.255.255

redistribute connected

neighbor 10.xx.10.1 remote-as 65AAA

neighbor 152.XXX.63.Y remote-as 65ZZZ

neighbor 152.XXX.63.Y route-map blockzero in - provider upstream router

no auto-summary

!

ip forward-protocol nd

ip route 0.0.0.0 0.0.0.0 198.XXX.255.YYY 250 - backup route from provider

ip route 10.XXX.0.0 255.255.0.0 10.XXX.10.1 - your for all site sbnets to our Core

!

ip bgp-community new-format

ip community-list 1 permit 65000:1

!

route-map blockzero deny 10

match community 1

!

route-map blockzero permit 20

!

the configurations look pretty harmless (new bgp commands should effect much at all).  Is it possible the BGP keep alives are not in the correct format between the 2801 and the 3750G???  And how would this have changed?

Thanks in advance for any assistance

Chris

Everyone's tags (3)
1 REPLY
Community Member

Strange BGP Issue

hello,

add the command : neighbor ip-address send-community both , int the edge router,

@+

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