Well, actually, I was referring to sending data from a larger *access speed* (or
access rate, or port speed - whatever term you prefer) to a smaller one. Not
CIR. For example, a frame relay service with 1Mbps access speed at one end,
connected to a service with 256 Kbps access speed at the other end. Unless you
implement traffic shaping or some other throttling mechanism, your router could
try to send date at 1 Mbps - it will never fit through the 256 Kbps pipe at the
other end. In this situation, the telco switch will toss away anything above
256 Kbps on that PVC when it first enters the cloud at the 1 Mbps end,
regardless of what the CIR is.
Anything above the CIR but below 256 Kbps will get the DE bit set.
And no, Worldcom isn't very big in this part of the world - it wasn't them :-)
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 04/10/2000 08:34 am
---------------------------
[EMAIL PROTECTED] on 03/10/2000 03:36:40 pm
Please respond to [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc: (bcc: JENNY MCLEOD/NSO/CSDA)
Subject: Re: ospf bandwidth question
In a message dated 10/3/00 12:16:20 AM Eastern Daylight Time,
[EMAIL PROTECTED] writes:
> Hmm... not so sure about that. I'm told by an unreliable source (my telco
> :-)
> that if you're sending from a large access speed to a smaller access speed,
> traffic exceeding the CIR + EIR (i.e traffic that won't 'fit' once it gets
> to
> the smaller end) will be dropped as soon as it enters the telco network. It
> isn't transmitted across the telco cloud at all, and thus doesn't produce
> F/BECNs (or congestion).
> This may be telco-dependant behaviour, I guess.
>
In this scenario of a larger bandwidth side trying to send into a smaller CIR
you would have DE bits inbound on the smaller side router. DE (discard
eligable) is any data sent over the line that is higher than the CIR because
it is "eligable for discard".
Let me guess...Worldcom told you that ;) On a side note. It's amazing how
many new terms the telco can introduse into the field when trying to think of
an RFO, haha
My 0.2 cents...
Mark Zabludovsky ~ CCNA, CCDA, 1/4-NP
<A HREF="mailto: [EMAIL PROTECTED]">[EMAIL PROTECTED]</A>
"If you need luck, apparently you're not prepared...Go study!"
~Mark Zabludovsky~
**NOTE: New CCNA/CCDA List has been formed. For more information go to
http://www.groupstudy.com/list/Associates.html
_________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
