From: Larry Roberts (groupstudy@american-hero.com)
Date: Mon Jul 18 2005 - 15:59:07 GMT-3
It looks to me like the link between The internal router and the Edge
isn't making its way into BGP to be sent to the Provider router. Pings
are sourced from the 172.16.1.x network which the provider has no Idea
how to reach.
Schulz, Dave wrote:
> Group -
>
> Here is a probably that I experienced in the lab this afternoon.......
> I have 3 routers set up .... 2 are in ibgp 123(Internal & Edge)....and
> one in bgp 456 (Provider).......
>
> Setup is like this...... Internal(BGP123) - - - - Edge(BGP123 - - - -
> - Provider (BGP456)
>
> Configs are : (non-pertinent information omitted)
>
> PROVIDER:
> interface Loopback0
> ip address 192.20.11.1 255.255.255.0
> !
> interface Serial0/0.1 point-to-point
> description Provider to Edge
> ip address 150.1.0.2 255.255.255.252
> frame-relay interface-dlci 100
> !
> router bgp 456
> no synchronization
> bgp log-neighbor-changes
> network 128.20.12.0 mask 255.255.252.0
> neighbor 150.1.0.1 remote-as 123
> no auto-summary
> !
>
> EDGE:
> interface Loopback0
> ip address 172.16.0.1 255.255.255.255
> !
> interface Serial0/0.1 point-to-point
> description Edge to Internal-Core
> ip address 172.16.1.6 255.255.255.252
> frame-relay interface-dlci 101
> !
> interface Serial0/0.2 point-to-point
> description Edge to Provider
> ip address 150.1.0.1 255.255.255.252
> frame-relay interface-dlci 100
> !
> router ospf 123
> log-adjacency-changes
> network 172.16.0.0 0.0.255.255 area 0
> default-information originate
> !
> router bgp 123
> bgp log-neighbor-changes
> network 197.1.0.0 mask 255.255.0.0
> aggregate-address 197.1.0.0 255.255.0.0 summary-only
> neighbor PG peer-group
> neighbor PG remote-as 123
> neighbor PG update-source Loopback0
> neighbor PG route-reflector-client
> neighbor PG next-hop-self
> neighbor 150.1.0.2 remote-as 456
> neighbor 172.16.0.3 peer-group PG
> neighbor 172.16.0.2 peer-group PG
>
>
> INTERNAL:
> interface Loopback0
> ip address 172.16.0.2 255.255.255.255
> !
> interface Serial0/0.2 point-to-point
> description Internal-Core to Edge
> ip address 172.16.1.5 255.255.255.252
> frame-relay interface-dlci 101
> !
> interface FastEthernet0/1
> no ip address
> shutdown
> speed auto
> half-duplex
> !
> router ospf 123
> log-adjacency-changes
> passive-interface Loopback0
> network 172.16.0.0 0.0.255.255 area 0
> !
> router bgp 123
> bgp log-neighbor-changes
> neighbor 172.16.0.1 remote-as 123
> neighbor 172.16.0.1 update-source Loopback0
> no auto-summary
> !
>
>
> The bgp database appears correct on all routers. And, I can ping the
> loopback interface on the "provider router" (192.20.11.1) from the Edge
> router, but for some reason....i cannot ping it from the Internal
> router. I have racked my brains trying every which way to get to it.
> Yet, I can see it in the bgp table of the internal router with the next
> hop as being the edge router. The ibgp and ebgp appears to be in order,
> but something is definitely missing. Any ideas?
>
>
> Dave Schulz
> Email: dschulz@dpsciences.com <mailto:dschulz@dpsciences.com >
>
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