BGP 3.4 Signaling w/Communities.

 

In this task, IEwb accounts for the advertisement down from R3 to R2, then using a send-community back up from R2 to R5.  I understand why perfectily n i did exactly the same thing, I also accounted for the traffic back from R3 to R4 SINCE R4 speaks bgp to R5 and could effectively advertise out the nets without the communtiy assigned.. so 4 additional lines..

Tell me what anyone thinks..

 

#R3

router bgp 200

  nei 187.1.134.4 send-community


#R4

ip bgp-community new-format

router bgp 200
 nei 187.1.45.5 send-community

 

IF NOT

   THEN

Rack1R5#sh ip bgp 150.1.33.0
BGP routing table entry for 150.1.33.0/24, version 60
Paths: (3 available, best #3, table Default-IP-Routing-Table)
Flag: 0x820
  Advertised to update-groups:
     1          2        
  200, (Received from a RR-client)
    187.1.235.2 from 187.1.235.2 (150.1.2.2)
      Origin IGP, metric 0, localpref 100, valid, internal
      Community: 100:546
  200
    187.1.235.3 from 187.1.235.3 (150.1.3.3)
      Origin IGP, metric 0, localpref 100, valid, external
      Community: 100:546
  200
    187.1.45.4 from 187.1.45.4 (150.1.4.4)
      Origin IGP, localpref 100, valid, external, best            ! UH-OH...

SO BEING THAT ITS preferring through R4 without the community, well that would mean we lost the rquirement..RIGHT?

AFTER Additinoal config

Rack1R5#sh ip bgp 150.1.33.0
BGP routing table entry for 150.1.33.0/24, version 71
Paths: (3 available, best #3, table Default-IP-Routing-Table)
Flag: 0x8C0
  Advertised to update-groups:
     1          2        
  200
    187.1.45.4 from 187.1.45.4 (150.1.4.4)
      Origin IGP, localpref 100, valid, external
      Community: 100:546
  200, (Received from a RR-client)
    187.1.235.2 from 187.1.235.2 (150.1.2.2)
      Origin IGP, metric 0, localpref 100, valid, internal
      Community: 100:546
  200
    187.1.235.3 from 187.1.235.3 (150.1.3.3)
      Origin IGP, metric 0, localpref 100, valid, external, best              ! IN MY OPINION.. IT LOOKS BETTER NOW.
      Community: 100:546

Any ideas ?  :o)

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