06-05-2009 10:15 AM - edited 03-17-2019 09:45 PM
We use IP phone at our branch office which talk to HQ's via 3T1 multilink. QoS is configured on both PTP routers and it's working fine on normal traffic. But when there is a spike (over75% bandiwdth) it effect the voice quality. What is the best practice to avoid that problem not to effect Voice traffic even though when there is a spike. We dont' have voice VALN setup though.
Thanks
06-05-2009 10:49 AM
Either your QoS is not configure properly, or it is not working correctly. Spikes in traffic should not affect voice quality.
06-05-2009 11:32 AM
Try applying this:
class-map voice
match protocol rtp audio
policy-map simple-voip
class voice
priority percent 60
class class-default
fair-queue
interface WAN 0/0
service-policy outbound simple-voip
-nick
06-05-2009 12:26 PM
What I have on our router is
class-map match-any CALL_SIGNALING
match ip dscp cs3
match ip dscp af31
class-map match-all VOICE
match ip dscp ef
!
!
policy-map WAN
class VOICE
priority percent 33
compress header ip rtp
class CALL_SIGNALING
bandwidth percent 1
class class-default
fair-queue
interface Multilink1
service-policy output WAN
Is that QoS proper configure?
06-05-2009 12:38 PM
That looks about right. I would check a few things:
1) That your packets are actually marked EF.
2) 'show policy map interface' doesn't show drops on the voice class. If so you need to increase your percentage.
hth,
nick
06-05-2009 12:46 PM
Thanks Nick for repling. I think so far qoS is ok. I might just increase percentage when there is a spike.
Class-map: VOICE (match-all)
151453587 packets, 18581102426 bytes
5 minute offered rate 488000 bps, drop rate 0 bps
Match: ip dscp ef (46)
Queueing
Strict Priority
Output Queue: Conversation 264
Bandwidth 33 (%)
Bandwidth 1528 (kbps) Burst 38200 (Bytes)
(pkts matched/bytes matched) 4169372/427211972
(total drops/bytes drops) 0/0
06-05-2009 04:08 PM
From this, it looks like it's not your QOS that is the problem.
Either you may be looking at it on the wrong side of the WAN connection, or something before or after this connection is dropping the packets. This looks clean.
-nick
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: