From: John Conzone (jkconzone@xxxxxxxx)
Date: Mon Sep 04 2000 - 11:38:44 GMT-3
----- Original Message -----
From: John Conzone
To: kkriel@netscape.net ; :ccielab@groupstudy.com
Sent: Monday, September 04, 2000 10:17 AM
Subject: Re: routed versus bridged interface
Hi, Kenny. I understand that.
What I am looking to do is break down the packets and go over
exactly what is happening.
If R1 is routing IPX , he looks in his routing table and see's IPX
network 700 on E0. Good. So the packet goes out on R1 E0.
R1 E0 is attached to R2 E0, which isn't routing IPX, but is in
bridge group 1. So R2 E0 bridges the packet. Okay. R2 has another
interface, Serial 0, which is in the same bridge group and isn't
routing IPX. Good so R2 E0 bridges the packet over to R2 S0, which
send it out its interface.
So far so good?
Okay. R2's S0 is directly attached to R3's S1. R3's S1is routing
IPX and is on the same network, 700. He gets the packet that was
bridged over from R2. It would sem to me that the bridged network in
between the routed interfaces shouldbe transparent to them.
I know i'm missing something. Is it the ethernet to serial
conversion?
----- Original Message -----
From: Kenneth Kriel
To: John Conzone
Sent: Monday, September 04, 2000 12:34 PM
Subject: RE: routed versus bridged interface
John,
If you have routing and bridging enabled on an interface then it will
route the frame and not bridge it. The rule is : when a router
receives a frame - check if it is routable, if so pass it to the
routing engine, if it is not then, and only then, bridge it.
That is why it is working with IRB !
Hope this helps !
Ken
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
John Conzone
Sent: Sunday, September 03, 2000 11:14 PM
To: ccielab
Subject: routed versus bridged interface
Guys, help me out again. Here's the scenario. I have three
routers in a row.
R1-----------R2------------R3
On R1, I'm routing IPX on its interface connected to R2, as well
as running bridging.
On R2, I only have bridging on both interfaces. No ipx routing.
On R3, I have IPX routing turned on onthe interface connected to
R2, and also bridging.
I cannot ping IPX bewteen R1 and R3. They are the same IPX
network.
If I configure IRB on R3, remove the IPX network from R3's
interface, put it on the BVI on R3 and route IPX on the BVI and it
works. The packets must be getting to R3 either way, but R3 cannot
decapsulate them when routing directly on the interface becasue he is
looking for a "routed" packet, but is recieveing a "bridged" packet
from R2.
Moving the IPX routing off the interface onto the BVI allows the
"bridged"packet to be decapsulated and passed to the BVI as a "routed"
packet.
Can someone break out what the packet looks like coming out of R1,
then out of R2 into R3?
What is it specifically in the packet header , the "bridged"
packet, that R3 see's when he tries to "route" the packet, that he
doesn't like. I'm drawing a blank although in my gut I understand
whats happening.
I've run into this when binding a virtual interface on a RSP on a
cat to a lane card, and then sending it to a router. I had to use BVI
to get the 1483 "bridged" packet to route.
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