STP and FR

From: Gerry Hilton (gerry.hilton@rogers.com)
Date: Fri Mar 07 2003 - 15:25:11 GMT-3


If you have 3 routers configured for FR and transparent bridging, with
the central router a multipoint interface and the end routers plain
serial interfaces, does the central router have to be the root bridge?
 I cannot get it to work unless this is the case. If the central
routers is not given a lower bridge priority then each of the end
routers think that they are the root.

1 end router:

interface Serial0
 ip address 150.50.24.4 255.255.255.0
 encapsulation frame-relay
 no ip route-cache
 no ip mroute-cache
 frame-relay map bridge 401 broadcast
 bridge-group 1
end

Central router:

interface Serial0.247 multipoint
 no ip route-cache
 frame-relay map bridge 107 broadcast
 frame-relay map bridge 104 broadcast
 bridge-group 1
end

2nd end router:

interface Serial0
 ip address 150.50.24.7 255.255.255.0
 encapsulation frame-relay
 no ip route-cache
 no ip mroute-cache
 frame-relay map bridge 701 broadcast
 bridge-group 1
end

Thanks,
  Gerry



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