We use Nortel IP phones (1140E), according to the Nortel documentation Voice media is tagged by the phones as DSCP 46 and Signalling as DSCP 40.
Can someone tell me where i have gone wrong! On my switch (3750) i trust the DSCP and have the cos-dscp map set
The router (2621XM) i have the COS-DSCP set, and a service policy. However when i view the service policy (atm0/0.1) i don't see anything tagged as DSCP 46 only 48:
Switch:
mls qos map cos-dscp 0 8 16 24 32 40 46 56
mls qos
interface r FastEthernet1/0/1 - 48
switchport access vlan 100
switchport mode access
switchport voice vlan 300
priority-queue out
mls qos trust dscp
spanning-tree portfast
Router:
mls qos map cos-dscp 0 8 16 24 32 40 46 56
class-map match-any Voice-Media
match ip dscp ef
match ip dscp cs6
class-map match-any Voice-Signalling
match ip dscp cs5
policy-map Torbay_VOIP
class Voice-Media
priority percent 20
class Voice-Signalling
bandwidth percent 5
class class-default
fair-queue
random-detect
interface ATM0/0
no ip address
no atm ilmi-keepalive
!
interface ATM0/0.1 point-to-point
description BT Baseband PREM to Pgn Library
ip address 172.25.200.234 255.255.255.252
cdp enable
pvc 0/32
vbr-nrt 4378 4378 1
encapsulation aal5snap
service-policy output Torbay_VOIP
#sh policy-map interface atm 0/0.1
ATM0/0.1: VC 0/32 -
Service-policy output: Torbay_VOIP
Class-map: Voice-Media (match-any)
80 packets, 14229 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp ef (46)
0 packets, 0 bytes
5 minute rate 0 bps
Match: ip dscp cs6 (48)
80 packets, 14229 bytes
5 minute rate 0 bps
Queueing
Strict Priority
Output Queue: Conversation 136
Bandwidth 20 (%)
Bandwidth 875 (kbps) Burst 21875 (Bytes)
(pkts matched/bytes matched) 80/14229
(total drops/bytes drops) 0/0
Class-map: Voice-Signalling (match-any)
9 packets, 450 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp cs5 (40)
9 packets, 450 bytes
5 minute rate 0 bps
Queueing
Output Queue: Conversation 137
Bandwidth 5 (%)
Bandwidth 218 (kbps)Max Threshold 64 (packets)
(pkts matched/bytes matched) 1/50
(depth/total drops/no-buffer drops) 0/0/0
Class-map: class-default (match-any)
5735 packets, 3604650 bytes
5 minute offered rate 234000 bps, drop rate 0 bps
Match: any
Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 128
(total queued/total drops/no-buffer drops) 0/0/0
exponential weight: 9
