Erich Wrote...
>I have checked the timing and from the CPE it appears to be correct. Our
>frame switch (CBX500) is providing the timing to him. I supposed our timing
>on the frame-switch could be off, but then more than a few customers would
>be affected. Im wondering if it isnt a crossed pair on the demarc, or a bad
>demarc extension. It is strange that the Show int S0 says
>Available Bandwidth 1152 kilobits/sec
>When in fact all 24 channels of this T1 are allocated to him
Notice the Available Bandwidth command below in Erich's serial interface
output. He thought that this may have been the problem, and I couldn't
remember what avail. bandwidth was, but I said I didn't think so. I did a
search on CCO and although the meaning didn't come up, I saw QOS on one of
the results, and it reminded me on what it was. When you have any queueing
on an interface, the router reserves 25% of a link/queue for routing
protocols, overhead and keepalives, etc.
So, for example, if you are doing LLQ and have a T1, then automatically when
assigning bandwidth for queues, you are stripped of 25% of the 1.554Mb,
leaving you with 1.152Mb to assign to the various classes. So if you wanted
to give 768k to web traffic and 768k to e-mail traffic, the router would
come up with an error message. Another example, RSVP, if it tries to make a
call, and all the 75% bandwidth that the router left you, is assigned (even
if it's not used) to the various classes, the router assumes there are no
resources to provide RSVP, and tells it to take a hike.
You can change the default 75% you have to work with with the
max-bandwidth-reserved (#%) command. So as I typed earlier, if you wanted
to keep just 10% for the routing protocols, you'd do max-reserved-bandwidth
90.
I believe this all came out in 12.1.5T, or maybe al ittle before.
His output....
Serial0 is up, line protocol is up
Hardware is PQUICC with Fractional T1 CSU/DSU
MTU 4000 bytes, BW 1536 Kbit, DLY 20000 usec,
reliability 171/255, txload 1/255, rxload 1/255
Encapsulation FRAME-RELAY IETF, loopback not set
Keepalive set (10 sec)
LMI enq sent 112, LMI stat recvd 91, LMI upd recvd 0, DTE LMI up
LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0
LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE
FR SVC disabled, LAPF state down
Broadcast queue 0/64, broadcasts sent/dropped 21/0, interface broadcasts 0
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:18:42
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/3/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
-----> Available Bandwidth 1152 kilobits/sec wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> At 02:14 PM 1/9/02, Steven A. Ridder wrote:
> >I can't find anything real quick. I did a serach and I saw QOS in with
the
> >avail bandwidth search results. So I'm pretty sure it's what the line
has
> >left over after the router reserves the 25% for routing protocols and
line
>
> What is what the line has left over? What is this in answer to? Please
copy
> the question (and discussion) with your answer. Assume that we work in
> connectionless, stateless mode. I get hundreds of e-mails. I can't
remember
> what this one goes with. It sure seem like an interesting conversation,
> though.
>
> Thanks.
>
> Priscilla
>
> >maintenance. You can chage it by the max-reserved bandwidth (#) command.
> >So if you wanted to keep just 10% for the routing protocols, you'd do
> >max-reserved-bandwidth 90. By default the router keeps 25%. It's for
RSVP,
> >and all the other queueing techniques.
> >
> >
> >
> >--
> >RFC 1149 Compliant.
> >
> >
> >FAQ, list archives, and subscription info:
> >http://www.groupstudy.com/list/cisco.html
> >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
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