How to prioritize voice traffic using c2621 and cisco IP telephones or other IP gateways through Frame Relay?
2621 is connected to Frame Relay and want to prioritize voice traffic going from Ethernet0/0 (other data traffic goes also via Ethernet 0/0)(using IP telephones or other IP gateways, which supports IP precedence)
Which type of queuing should we use (and how- the example would be the best) and what parameters should be set for FR links ?
RTP or constant voice traffic and Call control traffic wich does call setup and tear down. usually RTP is set up with an IP Precedence of 5 and Call Control has a precedence of 3. Only 8k of bandwidth is needed for call control traffic for hundreds of phones but depending on how many phones you have you can limit the priority or bandwidth in the policy.
map-class frame-relay voice
frame-relay cir 512000
frame-relay mincir 512000
service-policy output QOS-Policy
frame-relay class voice
match access-group 102
match access-group 101
priority percent 100
access-list 102 permit udp any any range 16384 32767
access-list 102 permit ip any any precedence 5
access-list 102 permit ip any any dscp ef
access-list 101 permit tcp any any range 2000 2002
access-list 101 permit tcp any any eq 1720
access-list 101 permit tcp any any range 11000 11999
access-list 101 permit udp any any eq 2427
This puts ip precedence 5 and 3 in different queues on my switch.
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