From: Scott Morris (smorris@internetworkexpert.com)
Date: Thu Sep 04 2008 - 17:02:32 ART
I'm not sure what this has to do with IPv6, but we'll go for it anyway. :)
The "ip rtp priority" command is a little odd in terms of the numbers it
uses. If it were an ACL, we'd expect a range with a starting point and
stopping point (16384 - 32767).
But someone decided to be different and have a starting point (16384) and
then a HOW MANY value (32767 ending minus 16384 starting = 16383 ports). Go
figure.
The port numbers by the way, come to us from the H.323 specification.
16384-32767 is for audio/voice
32768-49151 is for whiteboarding
49152-65535 is for video
Each of them is 16K worth of ports.
As for the 640, that's based on the speed of the circuit used (512K). The
general math is 80 bytes per 64K of link speed.
If you want a more entertaining way, once you set up your shaping and Bc,
check out "show traffic-shaping" and look at the maximum burst size in
bytes. In this case it'll say 640 provided you use 10ms Tc value. But
generally if it's less than 1000 bytes, you should fragment.
If it's over 1000 bytes, you COULD fragment, but typically the
fragmentation-delay that is introduced is actually longer than the
serialization-delay for the rest of the frame to get out of your way...
Thus it's left alone.
HTH,
Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
Senior CCIE Instructor
smorris@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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-----Original Message-----
From: Mark Stephanus Chandra [mailto:mark.chandra@gmail.com]
Sent: Thursday, September 04, 2008 12:59 PM
To: smorris@internetworkexpert.com
Cc: 'Cisco certification'
Subject: RE: Link-Local Address on IPv6
Guys,
Can Anyone explain , actually I have a question so prioritize voice rtp over
frame-relay
so I have an answer from IE
map-class frame-relay frts
frame-relay ip rtp priority 16384 16383 512 frame-relay fragment 640
How to determine 16384 16383 ? What is this udp port ?
Why Fragment frame-relay on 640 value ? How can we get this value ?
Thanks all in advance
Regards
Mark Stephanus Chandra
Study hard and be Eeeeviiiil......
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Mark
Stephanus Chandra
Sent: Thursday, September 04, 2008 9:17 AM
To: 'Cisco certification'
Subject: Link-Local Address on IPv6
Guys,
I still cannot undersand what the main purpose of link-local address. I know
that this addresses just for a link address and cannot be routed.
But when we implement RipNG on frame-relay, if I do not map my link-local
address, the RIP can is actually passing each other route but I cannot ping
to the other side of IPV6 network. Actually RipNG use multicast address to
establish adjencie with their neighbor.
I just wnt to know why this happen, why have to map link-local address
Thanks all
Regards
Mark Stephanus Chandra
IT Consultant
Blogs and organic groups at http://www.ccie.net
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