Subject: [rbridge] Ingress Rbridge address and BCN

From: manoj.k.wadekar at intel.com (Wadekar, Manoj K)
Date: Fri, 27 Oct 2006 10:53:58 -0700

Hi Eric,

	(My apologies for being slow in my responses..)
	
	I did not understand your comment about: " you have to be
careful not to send BCN messages to those end-stations that don't
support them." Can you please clarify? 

	Switches do not have knowledge of which end stations support
BCNs and which do not. 

	Have I missed your point?

Thanks,
- Manoj
	
-----Original Message-----
From: Gray, Eric [mailto:Eric.Gray at marconi.com] 
Sent: Friday, October 27, 2006 8:44 AM
To: Wadekar, Manoj K
Cc: rbridge at postel.org
Subject: RE: [rbridge] Ingress Rbridge address and BCN

Manoj,

	Once again, the assumption that cores do not retain "addresses
of
all the end-stations in [the] whole cluster" is a "convenient
assumption"
for making the argument that another mechanism is required.

	Currently, there would be no requirement for retaining all such 
addresses as you have to be careful not to send BCN messages to those
end-stations that don't support them.  Moreover, as mentioned
previously,
it is trivially easy to determine what address information should be
kept.

--
Eric

--> -----Original Message-----
--> From: rbridge-bounces at postel.org 
--> [mailto:rbridge-bounces at postel.org] On Behalf Of Wadekar, Manoj K
--> Sent: Friday, October 27, 2006 11:21 AM
--> To: rbridge at postel.org
--> Subject: Re: [rbridge] Ingress Rbridge address and BCN
--> 
--> 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.
--> 
--> Thanks,
--> - Manoj
--> 
--> -----Original Message-----
--> 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
--> ingresss RBridge? 
--> 
--> 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.
--> 
--> -- Silvano
--> 
--> > -----Original Message-----
--> > From: rbridge-bounces at postel.org 
--> [mailto:rbridge-bounces at postel.org]
--> On
--> > 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
--> > 
--> > Hi Manoj,
--> > 
--> > I'm confused about BCN. Wouldn't congestion notification 
--> need to go to
--> the
--> > original endnode source,
--> > and not the ingress RBridge?
--> > 
--> > Radia
--> > 
--> 
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