I think a better analogy would be if the first station was creating parts
too fast for the second station, and the bloke at the second station tells
the bloke at the first station 'slow down' (the BECN), and also tells the
bloke at the *third* station 'I'm run off my feet here' (the FECN). The
bloke at the third station can then either say 'too bad' (which is I
believe what happens in most frame relay implementations), or can, at least
in theory, take some appropriate action (reduce the first station's coffee
ration, perhaps? Have a tea break?)
I'm not aware of any common action taken by equipment receiving a FECN.
Theoretically the notification could be passed up to higher layers and
action could be taken there (e.g. adjusting window sizes), but I don't
believe this is recommended (others can no doubt give chapter and verse on
why, but I believe it basically comes down to the cure being worse than the
disease).
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 11/01/2001
09:36 am ---------------------------
[EMAIL PROTECTED]@groupstudy.com on 10/01/2001 03:54:29 pm
Please respond to [EMAIL PROTECTED]
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cc:
Subject: Not a problem, just a topic...
Hey Group,
Just for the sake of topics and answers, here's one for ya. I'm
cramming
for my remote access and hit the big boy...Frame Relay. I'm bringing up the
FECNs & BECNs topic here. I understand what they are and how they are used
and all that good stuff. The book says that when there is congestion on the
line from point A to point B, the frame switch in between will send out
BECNs
to the sender (A) and also FECNs to the receiver (B) of the data being
sent.
Fine, no problem right. Here's my question, and I know I'm just bringing
this
up to argue but what the hell. Why does the frame switch send FECNs to the
receiver telling him that that sender is sending too much??? This is my
analogy...There's a production line in a car factory, if the first station
was creating parts too fast for the second station to handle, you wouldn't
see the site manager (frame switch) go out and tell the guy at the second
station that there was a problem...he didn't do anything wrong right? I
would
imagine the manager just yells at the first station. Basically, why does
the
frame switch have to send FECNs to the receiver. I can understand the
BECNs.
It just seems like the receiver is getting a warning for being bad when it
was all the senders fault. This may sound childish to some but I'm trying
to
write it so it's simple. Just thought I'd rant a bit and bring out some
answers or opinions. Thanks group,
Mark Zabludovsky ~ CCNA, CCDA, 1/2-NP
<A HREF="mailto: [EMAIL PROTECTED]">[EMAIL PROTECTED]</A>
"Even if I knew I had only 1 more week to live, I would still schedule
my CCIE lab. I would just have to work a little harder I guess. After all,
without any goals in life, I'm dead already."
~Mark Zabludovsky~
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