11-27-2007 06:22 PM - edited 03-03-2019 07:42 PM
Hi
I need to configure QOS for SIP and RTP on our LAN switches. We have approximately 60 hosts connected to 2 x 3550-SMI switches that talk directly to 6 x PBX's on the same switches (30 hosts and 3 PBX's per switch). The hosts are PC's that run a voice application. They are also used for normal data. We have been experiencing some lost SIP initiation packets and dropped calls.
Any suggestions on how to prioritise SIP and RTP on the LAN?
Thanks
11-27-2007 06:37 PM
Take a look at this document regarding QoS config for your 3550 switch.
hieu
12-03-2007 04:46 AM
Please see the config below. Would this achieve the desired result of prioritising SIP and RTP traffic?
I haven't been able to test it because I can't get down time scheduled on the switch.
Thanks
mls qos map policed-dscp 24 26 46 to 0
mls qos map cos-dscp 0 8 16 26 32 46 48 56
mls qos min-reserve 5 170
mls qos min-reserve 6 85
mls qos min-reserve 7 51
mls qos min-reserve 8 34
mls qos
#RTP
access-list 100 permit udp any any range 16384 32767
#SIP
access-list 110 permit udp any any eq 5060
!
class-map match-all voip-rtp
match access-group 100
!
class-map match-all voip-control
match access-group 110
!
policy-map qos-voip
class voip-rtp
set dscp 46
police 320000 8000 exceed-action policed-dscp-transmit
class voip-control
set dscp 24
police 32000 8000 exceed-action policed-dscp-transmit
!
And then on all ports that connect to terminals as well as the gateway servers
!
int fast 0/XX
switchport mode dynamic desirable
service-policy input qos-voip
mls qos trust cos
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
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