From: dwhitley@xxxxxxxxx
Date: Tue Jun 12 2001 - 12:55:51 GMT-3
David,
Its still only a bridge, (layer 2), if the routers have different subnets,
(layer 3), on there interfaces, they won't communicated properly.
-----Original Message-----
From: David Anderson [mailto:dma@cisco.com]
Sent: Monday, June 11, 2001 12:25 PM
To: Justin Menga
Cc: 'Ken Yeo'; Roman Rodichev; ccielab@groupstudy.com
Subject: RE: confused about TrCRF and TrBRF
Justin, this is a great explanation. I do have a question though. I have
heard that if you have two different routers with each having a different
subnet on each router's tokenring interface, that you create two
BRFs....one for each VLAN? Does that make sense? Could you just do it as
described below? .....2 crfs (one for each VLAN) both assigned to the same
BRF?
Thanks,
David
At 03:38 PM 6/11/2001 +1200, Justin Menga wrote:
>A TrCRF represents a ring - the 'VLAN' number is actually a ring number and
>a name is just for administrative identification. Why do we use a VLAN
>number - well because a ring is very similar to a segment - hence a TrCRF
>can be represented by a VLAN.
>
>If you look at a traditional source routed environment, physically you have
>rings and bridges
>
>e.g.
>
>Ring 1 ----- Bridge 1 ----- Ring 2
>
>The bridge 'bridges' frames between each ring.
>
>Now a Token switch just implements the above at a logical level in a single
>physical device. A TrCRF corresponds to a ring and A TrBRF corresponds to
a
>Bridge
>
>
>E.g.
>
>TrCRF1 ---------- TrBRF1 -------- TrCRF2
>Ports 1,2 Ports 3,4
>
>The above TrCRFs have a parent TrBRF of 1, and Ports 1,2 are on the same
>ring (1) and 3,4 are on the same ring (2).
>
>Regards,
>
>Justin Menga CCIE #6640 CCNP+Voice+ATM CCDP MCSE+I CCSE
>Network and Security Consultant
>Computerland New Zealand
>PO Box 3631, Auckland
>DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
>mailto: justin.menga@computerland.co.nz
>web: http://www.computerland.co.nz
>
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>-----Original Message-----
>From: Ken Yeo [mailto:kenyeo@on-linecorp.com]
>Sent: Monday, 11 June 2001 2:54 p.m.
>To: Roman Rodichev; ccielab@groupstudy.com
>Subject: Re: confused about TrCRF and TrBRF
>
>
>Good question.
>
>The reason to assign VLAN number and name to TrCRF is to distinguish among
>TrCRFs? So why we need TrCRFs? My answer to my question is to create
domains
>to seperate source-route (RIF) and non-source-route (no RIF) frames.
>
>Anyone has a better enplaination?
>
>Thanks!
>
>
>----- Original Message -----
>From: "Roman Rodichev" <rodic000@hotmail.com>
>To: <ccielab@groupstudy.com>
>Sent: Sunday, June 10, 2001 5:28 PM
>Subject: confused about TrCRF and TrBRF
>
>
> > what is the purpose of assigning a vlan to trcrf?
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