Bridging over frame-relay question

From: robert.steeneken@getronics.com
Date: Mon Aug 27 2007 - 16:17:29 ART


Hello group,

I am been wrestling with bridging over frame-relay,
This is the test:

  602 206 405 504
R2-----------R6-------------R5
  s1 s0/2 s0/1 s1

R6
no ip routing
!
interface Serial0/1
 encapsulation frame-relay
 frame-relay map bridge 405 broadcast
 bridge-group 1
!
interface Serial0/2
 encapsulation frame-relay
 frame-relay map bridge 602 broadcast
 bridge-group 1
!
bridge 1 protocol ieee

R2
interface Serial1
 ip address 150.50.25.2 255.255.255.0
 encapsulation frame-relay
 no ip route-cache
 frame-relay map ip 150.50.25.5 206 broadcast
 no frame-relay inverse-arp

R5
interface Serial1
 ip address 150.50.25.5 255.255.255.0
 encapsulation frame-relay
 no ip route-cache
 frame-relay map ip 150.50.25.2 504 broadcast
 no frame-relay inverse-arp

I could not ping between R2 and R5.
Then I changed the setup to

          602 206 405 504
R1------R2-----------R6-------------R5-------BB1
  e0 e0 s1 s0/2 s0/1 s1 e0 e0

config of R6 stayed the same and moved the ip's ro R1 en BB1
now I can ping between the R1 and BB1. Why does it works now?

R2
no ip routing
!
interface Ethernet0
 no ip address
 no ip route-cache
 bridge-group 1
!
interface Serial1
 no ip address
 encapsulation frame-relay
 no ip route-cache
 frame-relay map bridge 206 broadcast
 bridge-group 1
!
bridge 1 protocol ieee
!
R5
no ip routing
!
interface Ethernet0
 no ip address
 no ip route-cache
 bridge-group 1
!
interface Serial1
 no ip address
 encapsulation frame-relay
 no ip route-cache
 frame-relay map bridge 504 broadcast
 bridge-group 1
!
bridge 1 protocol ieee
!



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