From: Pickell, Aaryn (Aaryn.Pickell@xxxxxxxxxxxxx)
Date: Sun Jul 01 2001 - 19:12:15 GMT-3
Khalid,
It's a matter of encapsulation on the wire. Between R1 and R7,
you're using Novell_Ether (or SNAP, or whatever) for your IPX packets.
Since R1 is bridging this, the Novell_Ether packets are being sent across
the serial link to R5. But, when you configure IPX on the serial 1
interface of R5, it's going to use Novell_HDLC encapsulation, (or whatever
the Novell encapsulation for serial links is), so it won't be able to see
those Novell_Ether packets. When you set up bridging on the serial
interface, and then make the BVI (which is a virtual ethernet interface),
it'll be using Novell_Ether encapsulation, so it can then see those packets.
Think about it... there's no MAC address on the serial interface, so
the router can't really respond to packets destined for a hardware address.
With the BVI, it has a MAC, so it can receive ethernet frames again.
-----Original Message-----
From: Khalid Nafie [mailto:knafie@ncr.com.kw]
Sent: Sunday, July 01, 2001 3:26 PM
To: Ccielab (E-mail)
Subject: Bridging Principle
Hi All,
I think we need to discuss this concept here, cause it confuses me
and I am sure it confuses a lot of ppl.
the question is when to bridge and when not?
through the bootcamp 8 as an example the requirements were to put same
network no. on both sides or router R1 so we have to bridge the ipx over
that router simply by creating bridge 1 and assign it to both interfaces,
clear.
now take a look to this diagram:
The rest of the network <==
R5--S1(net700)--------S0-R1-E0-------(Net700)E0-R7---
I tried to make bridging only on R1 but it didn't work I don't know why?
the solution is to configure IRB on R5 and bride the S1 on R5 then it will
work!!
I always think of the bridge as a hub but with a table to direct the traffic
to propriate port, but it looks like I am missing some vital principle here.
Can any one clarify why 1st solution didn't work while the second one
worked.
================================================
Yours,
Khaled Nafie
Network Engineer
Customer Services
MCSE,CCDP,CCNP VOICE ACCESS
NCR Corporation, Kuwait
Mob.: +965-9872046
Tel : +965- 2412201, 2412203
Fax : +965-2413075
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