As I am very week in QOS I need help here. I want to prioritize/dedicate bandwidth for voice traffic to head office from all the branch offices. Few branch offices are connected with L3 MPLS and few are with leased line.
Only prioritizing/or dedicate few bandwidth voice on the network will do and all other traffic can treat as default and can use the remaining bandwidth.
Branch offices I have cisco 2821 please advice what is the easiest way to achive this I have prepared a configuration with help of google J( below given) but I don’t how much this will help…
Thank u all
class-map match-any voice-traffic
match dscp ef
class-map match-any voice-signal
match dscp af31
shape average 350000 3500 0
service-policy output shaper
your configuration looks like correct
the parent policy shaper creates a logical pipe at rate 350000 bps and invokes as a child the voice-policy scheduler
a low latency queue (priority 200) with 200000 bps is allocated for packets with DSCP = EF (voice bearer channels but also other packet if they are marked the same)
you provide a bandwidth of 8 kbps for signalling (you may want to increase this).
Note also that this QoS configuration does not provide call admission control: there is no control on the number of concurrent voice calls.
You should configure CAC on the VOIP IP PABX so that you never try to go over the stated priority queue settings or all calls will be disturbed.
how much bandwidth is used depends on voice codec:
with G.711 you have a 64 kbps (paylod) that can count as 90 kbps on the wire so limiting the max calls to 2 would be wise.
Hope to help