, I need some information on QOS. My Boss gave me a project to implement a basic QoS on 1 of our remote locations which has a DSL link to the HQ. I need the basic configuration to implement on this 2851 router.
Since i'm new to cisco VoIP I would appriciate if you can help me with the commands.. Also, I want to make sure we have enough DSCP resources available ? how to do this ?
You can do a search on cisco.com (or google) for LLQ QOS.
Here's a sample voice qos config:
class-map match-any voice-control
match ip dscp af31
match ip dscp cs3
match access-group 101
class-map match-any voice-RTP
match ip dscp ef
match ip rtp 16384 16383
set dscp ef
set dscp af31
access-list 101 permit udp any any range 2427 2428
access-list 101 permit tcp any any range 1718 1720
access-list 101 permit tcp any any eq 1731
!For Skinny (phones registered to CCM)
access-list 101 permit tcp any any eq 2000
access-list 101 permit tcp any any eq 5060
service-policy output Voice-QoS
Note that for some versions of IOS, the command 'match ip dscp' needs to be replaced with 'match dscp'.
What this will do is take any traffic marked as a DSCP of 'ef', or any unmarked RTP traffic, and marks it as RTP traffic and sets the DSCP values accordingly. This traffic is sent to a priority queue. Then, it takes any traffic marked as DSCP of 'af31' or running on port thatis used for control traffic, marks it as control traffic (and sets the DSCP if needed), then puts it in a queue. All other traffic is sent to the fair-queue.
Estimate about 8K of call-control traffic per call. You can find out how much bandwidth you will need for RTP traffic with the voice-call bandwidth calculator found here:
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