The PC shouldn't ARP for a bridge. A bridge is transparent. It should ARP
for the end station. Something is weird with addressing and submasks.
Priscilla
At 03:22 PM 6/4/01, Philip Barker wrote:
>Hi Group,
> I vill say ziss only vonce.
>
>Okay, its my second attempt at trying to work out how I can bridge IP across
>to 2500's.
>
>I have 2 2500's configured with "no ip routing". 2 PC's are connected at
>either end, i.e one to bridge 1
>and one to bridge 2. I have a sniffer on both PC's. I am attempting to ping
>from one PC to the other.
>IEEE spanning tree is applied on both bridges. The bridges are connected via
>a
>serial cable and the serial
>ports of the bridges as well as the Ethernet ports are in bridge group 1.
>
>I have verified spanning tree operation and one of the serial ports has been
>elected root port on bridge 1,
>the other bridge is the designated bridge. Ref : Radia Perlman,
>Interconnections p.83.
>So far so good.
>
>I have configured the PC's with a default gateway to the IP address of each
>of
>the bridges.
>When I attempt to ping from one PC to the other, I can see from my Sniffer
>trace that the PC ARP's for
>the MAC Address of the bridge, this ARP is successful and the PC then sends
>out an ICMP echo request.
>This echo request appears to be my problem since the destination MAC address
>of this packet contains
>the Ethernet Mac address of the local bridge and the local bridge
>consequently
>disregards the packet.
>Should the PC have an ARP entry installed for the destination IP address
that
>I am pinging ?
>
>Has anyone achieved this scenario ? or am I way off mark with my thinking
>here.
>
>The reason I set this LAB up was because so many questions appear to be
being
>asked at CCIE written level
>akin to this setup i.e can PC 1 ping PC 2 in similar arrangement using
>(RSRB/DLSW+/SRB etc)
>
>Any comments welcome.
>
>Regards,
>
>Phil.
________________________
Priscilla Oppenheimer
http://www.priscilla.com
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=7130&t=7126
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