Thats right, and to be more precise, it matches every RTP+UDP packet in that range, by default Cisco and almost all vendors use RTP even ports (and RTCP odd ports)
What I mean is that "match ip rtp 16384 16383" does not match every UDP even port, but every RTP+UDP port. //r.a. On Fri, Dec 17, 2010 at 8:24 AM, Nicolas MICHEL <[email protected]>wrote: > Thanks Ricardo for the explanation it makes sense now. > > > however, I agree for the ACL range but what about the command > > > match ip rtp 16384 16383 . it matches every even number in the RTP UDP > range 16384 32767 right ? > > > Thanks > > > > > But the example are match ip > > 2010/12/17 Ricardo <[email protected]> > > Nicolas, >> >> When working with ranges in a class map definition we define the starting >> port number and the range of ports, ie 16384 as staring port and 16383 more >> ports, that is up to port 32767. >> >> When using ACL we define a range: ie starting and ending port. >> >> Moreover when we work with ACL we define ANY traffic using UDP and with >> class-maps only the RTP using UDP ports. >> >> To talk about something deeper however is that a good thing of ACL though >> is that we have included RTCP (odd even port numbers) as well, not in the >> class map matching RTP Only. >> >> //r.a. >> >> On Fri, Dec 17, 2010 at 6:25 AM, Nicolas MICHEL >> <[email protected]>wrote: >> >>> Hey there guys! >>> >>> I'm actually reading Cisco QoS Book from Wendell Odom and something is >>> interesting here. >>> >>> They are using class-map like this to match ALL RTP traffic >>> >>> class-map RTP >>> match ip rtp 16384 16383 >>> >>> >>> Isn't that weird ? In most document I see that they use an ACL that match >>> UDP 16384 to 32767 . >>> >>> >>> Can someone have some hints about this ? >>> >>> >>> many thanks for the help provided. >>> >>> >>> >>> Nicolas >>> _______________________________________________ >>> For more information regarding industry leading CCIE Lab training, please >>> visit www.ipexpert.com >>> >> >> > > > -- > Nicolas MICHEL > Ingenieur Réseaux et Securité (CCNA/CCNP) > > > > > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
