From: Justin Menga (Justin.Menga@xxxxxxxxxxxxxxxxxx)
Date: Tue Dec 12 2000 - 06:13:39 GMT-3
Hi,
WIth SRT - the switch will transparently bridge frames without a RIF and
source-route bridge frames with a RIF.
However it will not modify the RIF - I can't see how SRB will work if it
doesn't do this (build explorers won't work?)
-----Original Message-----
From: watsonf [mailto:watsonf@gte.net]
Sent: Tuesday, December 12, 2000 9:57 PM
To: Justin Menga; ccielab@groupstudy.com
Subject: Re: TrBRF and TrCRF
Hi Justin,
According to the documentation a TrBRF "is the parent VLAN to which TrCRF
VLANs are assigned. Traffic is switched between ports in a TrCRF and bridged
between TrCRFs in a TrBRF."
It goes on to say that "For source routing, the switch appears as a single
bridge between the distributed rings. The TrBRF can function as an SRB or
SRT bridge running either the IBM or IEEE Spanning-Tree Protocol" and that
"you can use a combination of SRT and SRB modes. In a mixed mode the TrBRF
considers some ports (internal ports connected to TrCRFs) to be operating in
SRB mode while others are operating in SRT mode."
Whether the TrBRF acts as an SRB or SRT bridge is determined by how you
define the TrCRF (SRB or SRT).
So to answer your question more specifcally:
1. It depends on the CRF mode as to whether the TrBRF is acting as an SRB or
SRT
2. Yes
3. Yes
Hope this helps. Aloha,
Fred Watson
CCIE #6561
----- Original Message -----
From: "Justin Menga" <Justin.Menga@computerland.co.nz>
To: <ccielab@groupstudy.com>
Sent: Monday, December 11, 2000 8:27 PM
Subject: TrBRF and TrCRF
> Hi,
>
> Can someone confirm if I am right about TrBRF's and TrCRF's:
>
> A TrBRF logically is a Source-Route Bridge.
> A TrCRF is a VLAN that logically represents a single ring.
> All TrCRF's have a parent TrBRF.
>
> To illustrate, say we create a TrBRF and assign it a bridge number of 1.
We
> then create two TrCRFs with ring numbers 1 and 2.
> In SRB terms we now have:
>
> Ring 1------Bridge 1-------Ring 2
>
> Does the above make sense and does this thinking apply for Catalyst 39xx?
> (I have tested all this with Cat5K).
>
>
> Regards,
>
> Justin Menga MCSE+I CCNP CCSE ASE
> WAN Specialist
> Computerland New Zealand
> PO Box 3631, Auckland
> DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
> mailto: justin.menga@computerland.co.nz
>
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