From: Jack Heney (jheneyccie@xxxxxxxxxxx)
Date: Tue Oct 03 2000 - 18:40:27 GMT-3
Okay...It's becoming clearer but I have 2 more questions....Why is the
majority of your ring level broadcast traffic MAC frames? Also, It says
that you can configure the 3900 for either SRB or SRT between the trcrf and
the trbrf...If I choose SRT for two trcrf's that share a parent trbrf, does
that mean that these broadcasts will span multiple trcrf's...For that
matter, if I choose SRB for both trcrf's, will that prevent the broadcasts
from being bridged from one trcrf to another through the trbrf?
Thanks again,
Jack
>From: "McNutt, Steve" <Steve.McNutt@ahlcorp.com>
>Reply-To: "McNutt, Steve" <Steve.McNutt@ahlcorp.com>
>To: "'ccielab@groupstudy.com'" <ccielab@groupstudy.com>
>Subject: RE: Token Ring Vlans
>Date: Tue, 3 Oct 2000 15:48:22 -0400
>
>Hey, that was a pretty good explanation.. except for the Cisco
>markettecture
>about the usefulness of TRCRFs. ;-)
>
>In reality, MAC frames (which are comprise the bulk of your ring level
>broadcast traffic) do not span the TRCRF or even enter the backplane of the
>switch (switchports in the same trcrf are transparently bridged). the
>microsegmentation effect occurs regardless of whether two switchports are
>on
>the same or different trcrfs.
>
>My experience has been that you use multiple TRCRFs because TRCRFs cannot
>span switches(with the execption of the default trcrf), whereas TRBRFs can.
>So if you have multiple switches that you want to be on the same ip subnet,
>you need to create a TRCRF for each switch and then assign it to the same
>parent TRBRF.
>
>
>-----Original Message-----
>From: Asbjorn Hojmark [mailto:Asbjorn@Hojmark.ORG]
>Sent: Tuesday, October 03, 2000 2:57 PM
>To: 'Jack Heney'
>Cc: ccielab@groupstudy.com
>Subject: RE: Token Ring Vlans
>
> > If so, what advantage is gained by creating these vlans?
>
>It's like micro-segmentation for token-ring. Remember that
>stations on a ring share a token and that some frames are
>local to a ring while others are global for the bridged
>domain.
>
> > Also, can rings that don't share the same parent trbrf
> > communicate without some sort of routing occurring
>
>No.
>
>HTH,
>-A
>--
>Heroes: Vint Cerf & Bob Kahn, Leonard Kleinrock, Robert Metcalfe
>Links : http://www.hojmark.org/networking/
>
>
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