Hello
I'm working in deploying QoS in a branch office
but I'm getting poor voice quality on calls.
here is the configuration of the QoS parameters
*****************************************class-map match-all VOZ
match dscp ef
class-map match-all VOZ(SIGNAL)
match dscp af31
class-map match-all APLICACION-CRITICA
match access-group name AS400
!
!
policy-map POLITICAS-QoS
class VOZ
priority percent 60
class VOZ(SIGNAL)
bandwidth percent 5
class APLICACION-CRITICA
bandwidth percent 10
class class-default
fair-queue
*****************************************
!
!
!
interface FastEthernet0/0
description LAN
ip address 10.12.1.1 255.255.255.0
speed auto
!
interface Serial0/0
description Link to HQ
bandwidth 128
ip address 192.168.50.42 255.255.255.252
service-policy output POLITICAS-QoS
load-interval 60
compress stac
!
interface BRI1/0
no ip address
shutdown
!
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0/0
ip route 16.0.0.0 255.255.255.0 Serial0/0
no ip http server
!
ip access-list extended AS400
permit ip any host 16.0.0.2
Now take a look at the Output of the show policy-map interface serial 0/0
CS-1760-PN#show policy-map interface serial 0/0
Serial0/0
Service-policy output: POLITICAS-QoS
Class-map: VOZ (match-all)
1034703 packets, 66220992 bytes
1 minute offered rate 147000 bps, drop rate 71000 bps
Match: dscp ef
Queueing
Strict Priority
Output Queue: Conversation 40
Bandwidth 60 (%)
Bandwidth 76 (kbps) Burst 1900 (Bytes)
(pkts matched/bytes matched) 1034703/66220992
(total drops/bytes drops) 530418/33946752
Class-map: VOZ(SIGNAL) (match-all)
0 packets, 0 bytes
1 minute offered rate 0 bps, drop rate 0 bps
Match: dscp af31
Queueing
Output Queue: Conversation 41
Bandwidth 5 (%)
Bandwidth 6 (kbps) Max Threshold 64 (packets)
(pkts matched/bytes matched) 0/0
(depth/total drops/no-buffer drops) 0/0/0
Class-map: APLICACION-CRITICA (match-all)
1423 packets, 84273 bytes
1 minute offered rate 0 bps, drop rate 0 bps
Match: access-group name AS400
Queueing
Output Queue: Conversation 42
Bandwidth 10 (%)
Bandwidth 12 (kbps) Max Threshold 64 (packets)
(pkts matched/bytes matched) 1423/84273
(depth/total drops/no-buffer drops) 0/0/0
Class-map: class-default (match-any)
38296 packets, 21064743 bytes
1 minute offered rate 47000 bps, drop rate 0 bps
Match: any
Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 32
(total queued/total drops/no-buffer drops) 11/130/0
CS-1760-PN#
As you can see there are A LOT of packets being dropped
related to DSCP ef (voice bearer packets) but there are
actually 0 (ZERO!!) calls being place at this time
Notice that there is also 0 packets matching DSCP af31 (voice signaling)
Can anyone tell me what might be happeing here ??
Why am I getting so many drops ?
Thanks
