From: Fred Ingham (fningham@xxxxxxxxxxxxxxxx)
Date: Sun Dec 02 2001 - 14:54:17 GMT-3
Paul: The encap fail would indicate that the packet is not leaving
the frame sw router. Check that e0 of the frame sw is ok, should be
able to ping itself. Then check that e0 of fr sw and r2 are in same
vlan (vlan x1 in the exercise)
and that e0 of r2 has br-group 1.
The key troubleshooting commands are sh span (r1 should be the root, cat
should be secondary). Note the number of ports on r1 (hint). And sh
bridge (you will see Tx and Rx counts). A good method to check the path
is to start a continuous ping from the frame sw and see how far it
gets. Then do the same for r3. Monitor Tx and Rx counts.
You could look at the answer key to check configs. Or send me your
configs and I will
point out areas to look at.
Cheers, Fred.
Paul Young wrote:
>
> I'm was working on ECP1 Exercise 7 Transparent
> Bridging, Spanning Tree & IRB but couldn't get ping
> to work from Frame Switch to R3's BVI IP address as
> described in the lab.
>
> Irb & Transparent bridging
> (bridge 1 protocol ieee, bridge-group 1) are on all
> routers (R1, R2, R3, R4's serial plus ethernet
> interface). IP addresses configured on Eth0 of the
> Frame switch & BVI1 on R3 only. Bridge 1 route ip
> also configured on R3 (where BVI1 is). No Transparent
> bridging statements or irb is configured on the Frame
> Switch router (physical IP assigned to Ethernet
> interface only).
> Frame configuration as follows:
> R1 has serial sub-interface s0/0.123 (multi-point)
> with 3 frame map bridge DLCI# broadcast statements as
> well as bridge-group 1 statement. R2, R3, R4 each has
> a physical serial frame configuration (s0 with no
> sub-interface) and 1 frame map bridge DLCI# broadcast
> plus bridge-group 1 at each router (r2, r3, r4) going
> back to R1 (no IP addresses are assigned to serial or
> ethernet interface as mentioned, except on the Frame
> Switch router).
>
> When trying to ping R3 BVI1's interface from the frame
> switch router with debug ip & icmp enabled, it shows
> encap fail message.
>
> Anyone has any idea or suggestions of getting this to
> work is much appreciate it, thanks.
>
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