halabi bgp cont...

it's paint by numbers...

rtc(config)#router bgp 1
rtc(config-router)#neigh 172.16.20.2 remote-as 3
rtc(config-router)#
*Jan 30 11:58:39: %BGP-5-ADJCHANGE: neighbor 172.16.20.2 Up
rtc(config-router)#end
rtc#
*Jan 30 11:58:51: %SYS-5-CONFIG_I: Configured from console by console
rtc#sh tcp brie all
TCB       Local Address               Foreign Address             (state)
67F17354  172.16.20.1.179             172.16.20.2.63717            ESTAB
68636BC8  0.0.0.0.179                 172.16.20.2.*                LISTEN

i do love that show tcp brief all command...

i hate when i'm an idiot, but i'm used to it... he gives no config for rte, he just states in the topology that it doesn't have bgp...

here is the rtd config:

rtd#sh run | b router
router ospf 10
 network 192.68.0.0 0.0.255.255 area 0
!
router bgp 2
 bgp log-neighbor-changes
 neighbor 192.68.5.1 remote-as 3
 neighbor 192.68.5.1 ebgp-multihop 2

so i configured rte thus...

rte#sh run int s1/0
Building configuration...

Current configuration : 88 bytes
!
interface Serial1/0
 ip address 192.68.5.2 255.255.255.0
 serial restart-delay 0
end

rte#sh run int s1/1
Building configuration...

Current configuration : 89 bytes
!
interface Serial1/1
 ip address 192.68.12.2 255.255.255.0
 serial restart-delay 0
end

rte#sh run | b router
router ospf 1
 network 192.68.0.0 0.0.255.255 area 0

this is shalabi's output... look closely...

RTF#show ip bgp neighbor
 BGP neighbor is 172.16.2.254, remote AS 3, internal link
 BGP version 4, remote router ID 172.16.2.254
 BGP state = Established, table version = 2, up for 22:36:09

 BGP neighbor is 192.68.12.1, remote AS 2, external link
 BGP version 4, remote router ID 192.68.5.2
 BGP state = Established, table version = 2, up for 22:13:01

not sure how that can be... he explicitly states that rte is not running bgp... 192.68.5.2 is the other side of rtf's serial connection... i stand by my configuration...

rtf#sh ip bgp neigh | i BGP
BGP neighbor is 172.16.2.254,  remote AS 3, internal link
  BGP version 4, remote router ID 172.16.2.254
  BGP state = Established, up for 00:43:01
  BGP table version 1, neighbor version 1/0
 
BGP neighbor is 192.68.12.1,  remote AS 2, external link
  BGP version 4, remote router ID 192.68.12.1
  BGP state = Established, up for 00:10:12
  BGP table version 1, neighbor version 1/0
  Last reset 00:12:29, due to BGP protocol initialization
  External BGP neighbor may be up to 2 hops away.

somebody's lying to somebody here...

then he writes:

RTF's other neighbor 192.68.12.1 is also in an established state. This external neighbor belongs to AS2. Note that the display indicates that this neighbor is two hops away (as configured in the ebgp-multihop).

which confirms my configuration...