Indeed. Bridging using two 2500s as mentioned makes the routers operate
strictly at layer 2. They will not forward packets of any kind using
layer 3 methodology. In effect, they will not use any layer 3
forwarding mechanism so you cannot point a PC's def. gtwy to their local
interface. Your PC will operate just fine without any gateway if all
you need to do is establish connectivity to the other PC across the
bridge. Both PCs should be in the same network of course. If they
aren't then you know that you need to route and not bridge.
Vijay Ramcharan
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Charles Manafa
Sent: Monday, June 04, 2001 4:17 PM
To: [EMAIL PROTECTED]
Subject: RE: Transparent Bridging ? [7:7126]
Check your addressing. Both PCs should be on the same subnet, and do not
require a default gateway. A PC should not be configured with the IP
address of a bridge as the default gateway.
CM
-----Original Message-----
From: Philip Barker
To: [EMAIL PROTECTED]
Sent: 04/06/01 20:22
Subject: Transparent Bridging ? [7:7126]
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.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=7151&t=7126
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