Marking at a Switch for Voice

At the 7921 Deployment Guide you’ll see at page 19 some Qos Examples for Voice at the Network.

It’s possible to narrow the flow if you know the CUCM and the VoiceVlan.

Port SCCP (2000) is always src and dst of the CUCM.
RTP is the src and dst of the phones with the range of port 16384 – 32767

access-list 101 permit tcp host CUCM IP eq 2000 DST VoiceVlan
access-list 102 permit udp SRC VoiceVlan range 16384 32767 DST VoiceVlan 16384 32767

class-map match-all SCCP
match access 101
class-map match-all RTP
match access 102

policy-map Voice
class SCCP
set dscp cs3
class RTP
set dscp ef

interface f 0/4
service-policy input Voice

If you try a
service-policy output Voice
at a 3560 switch, it won’t accept the command :

SW3560(config-if)#service-policy out Voice
Warning: Assigning a policy map to the output side of an interface not supported

At a 6500 switch you can do Service-policy input and output…..

About Joost van der Made


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