[rbridge] Ingress Rbridge address and BCN
Radia.Perlman at sun.com
Fri Oct 27 09:03:44 PDT 2006
Interesting. In theory, it is possible to send a packet to an unknown
destination MAC by sending
through the ingress RBridge tree rooted at the RBridge that decided to
send the BCN (or rooted
at the Designated RBridge on the link on which some legacy bridge
decided to send the BCN).
But if there are going to lots of BCN's, then it would cut down on
traffic to know the original
ingress RBridge, since the BCN's would never needed to be sent
everywhere---just direct to
the ingress RBridge.
Just to make sure I do understand though, the intent is that the BCN
does need to get to the
original source of the packet, and the ingress RBridge of the original
packet will only forward the
BCN to the source, right?
Wadekar, Manoj K wrote:
>Yes, for large clusters, if cores do not maintain addresses of all the
>end-stations in whole cluster - then only way to get BCN back to ES, is
>to send them to ingress rbridge-address and then have that ingress
>rbridge forward BCN to end station with appropriate ES address.
>If so, ingress rbdridge address seems to be requirement to me.
>From: Silvano Gai [mailto:sgai at nuovasystems.com]
>Sent: Friday, October 27, 2006 8:00 AM
>To: Radia.Perlman at sun.com; Wadekar, Manoj K
>Cc: rbridge at postel.org
>Subject: RE: [rbridge] Ingress Rbridge address and BCN
>If the congestion is detected in the core of the TRILL network, how do
>you signal back to the source host if you don't know which is the
>You cannot look-up the inner MAC address, because in the core of the
>network you don't keep the inner MAC addresses in the table. Correct?
>This is a clear reason while you need the ingress RBridge address.
>>From: rbridge-bounces at postel.org [mailto:rbridge-bounces at postel.org]
>>Behalf Of Radia.Perlman at sun.com
>>Sent: Thursday, October 26, 2006 5:02 PM
>>To: Wadekar, Manoj K
>>Cc: rbridge at postel.org
>>Subject: Re: [rbridge] Ingress Rbridge address and BCN
>>I'm confused about BCN. Wouldn't congestion notification need to go to
>>original endnode source,
>>and not the ingress RBridge?
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>rbridge at postel.org
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