One of my customers is connected to my backbone by use of two 828 devices having a line of 1 Mbps in between. My backbone is running Mpls and I am trying to apply QoS for voice on these 828's. I tried priority queueing. Though the configuration looks working, whenever the traffic exceeds 700 - 800 kbps, the quality of voice degrades seriously.
My config is like: (similar on both sides)
class-map match-any voice_priority
match access-group 110
interface ATM0.1 point-to-point
ip address 172.16.0.137 255.255.255.252
no snmp trap link-status
service-policy output voice
access-list 110 permit ip any host 89.*.*.200
access-list 110 permit ip any host 89.*.*.202
Can you advice any other solution? Could rsvp be used?
are you sure the ACL does describe the voice traffic?
Seems a little strange that anything leaving your site towards 89.0.6.X is voice. I would assume you better use voip source IP to destination IPs in the ACL. An even better approach would be to use NBAR through
class-map match-all voice_priority
match protocol rtp audio
To check your policy use "show policy-map inetrface" and look out for matches in the voice class. Also check for drops, as also too much voip traffic could cause issues.
At last: a simple approach would be to use "auto aos voip".
The suggested adjustments depend on feature availability in your IOS. An upgrade might be required.
marking for sure is a good approach to solve the issue. What I also meant: is the ACL really capturing ALL voip traffic? No other IPs can be the destination? Voip f.e. is routed directly between voip phones.
So an ACL specifying all source IPs would probably be more effective.
In case you mark and match on the markings: make sure to set all Catalyst LAN ports voip traffic is crossing to trusted. Otherwise the first switch will remark to 0 and it wont work as expected.
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