baby bridging

From: Wayne Lewis (lewisway@xxxxxxxxxxxxxx)
Date: Sat Jan 05 2002 - 23:41:07 GMT-3

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        I have a basic transparent bridging question. Here's the setup:

R1 (E0) -- Cat -- (E0) R2 (S0) --HDLC-- (S0) R3

R1 has an IP configured on E0, ip routing is disabled (R1's acting like a
host).

Cat has the default configuration (nothing configured)

R2 has bridging configured on E0 and S0 (bridge-group 1) with ieee STP and
no ip routing.

R3 has ip routing disabled, R3's S0 has an IP on the same network as R1's.

R3 cannot ping R1 with this setup, but if I add bridge-group 1 on R3's S0
and ieee STP on R3, it can ping. Why is this?

What is the rule about configuring bridging on an interface with IP
configured? It automatically bridges IP? Why does R3 require the bridging
commands, but not R1?

        Thanks,

          Wayne

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