[rbridge] Ingress Rbridge address and BCN

[Gray, Eric]

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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