From: Mike Kraus \(mikraus\) (mikraus@cisco.com)
Date: Sun Jul 08 2007 - 16:58:32 ART
I'll explain in reverse order:
3) Access-list - all UDP traffic with destination ports (even and odd)
within the range specified. So, this would match RTP & RTCP traffic.
2) match ip rtp - all UDP traffic with even destination ports within
the range specified (more specific).
1) match protocol rtp - uses NBAR to not only identify RTP traffic, but
can further classify audio/video with specific traffic-types.
In general, I would be as specific as you can when matching traffic. As
an example, if a question tells you to match voice traffic, pick 1
(since then you can specify just audio). If the question says match
only voice and video payload, you can pick either 1 or 2. Or, maybe
they will say something like don't use NBAR, which would force you into
2. If the question says match all RTP and RTCP traffic, then you'd be
forced into picking 3, since 1 & 2 do not match RTCP.
Sometimes when comparing things like this, looking at when the command
was introduced can help you understand the logic. (In this case,
access-list, then match ip rtp, then match protocol rtp, were released).
So, as time has gone on, you have gotten more granular ways of matching
real-time traffic.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Adham Ali
Sent: Sunday, July 08, 2007 2:24 PM
To: ccielab@groupstudy.com
Subject: Real Time Protocol question!
Dear all,
I am a bit confused about what is the difference between the below
methods and when to use each
1)match protocol rtp
2)match ip rtp [starting port numbre] [port range]
3)access-list 100 permit udp any any range 16384 32767
class-map test
match access-group 100
Thank you in advance,,
Adham..
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