From: Fred Ingham (fingham@cox.net)
Date: Tue Oct 01 2002 - 00:56:18 GMT-3
Rich: The two R1 bridge ports are the multipoint subinterface to R2/R3 and
the PTP subinterface to R4. Since the packets originate from R2 they will not
be forwarded to R3 (same port) but will be forwarded to R4. Once you have
spotted this issue then the solution is to make the R4 path to the R3 BVI a
lower cost than the R1-R3 path.
This is done on the R3 Serial interface.
HTH, Fred.
----- Original Message -----
From: Richard Davidson
To: Discuss-it ; groupstudy
Sent: Sunday, September 29, 2002 10:49 PM
Subject: [discuss-it]NMC1 Exercise 10 - Transparent bridging
Please bear with me on this...
R1 is configured as a multipoint interface to r2 and r3. In this lab r3
didn't use R1 as it's DR bridge, it used cat. If r3 had used r1 as it's DR
bridge the ping from r6 to 3's bvi would have failed. This is what I'm
experiencing. I think it's because the interface on r1 is receiving both r2
and r3 on the same sub interface and will not send packets back out those
interfaces, due to the switching rule (packets in, forward out all ports
except the one it entered on). I think that's why r6 cant ping r3 know that
r3 is using r1 as it's DR. Does anyone know how I could get this to work,
without using different sub interfaces?
Rich
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