I have MPLS VPN scenario. For MPLS VPN at PE router connecting to hub, I've configured below QoS:
class-map match-any P1
match ip dscp ef
class-map match-any P3
match ip dscp default
class-map match-any P2
match ip dscp af31
priority percent 35
bandwidth percent 40
bandwidth percent 25
Since on the egree PE towords the internet, I'm using subinterface thus, the configuration is:
shape average 256000
service-policy output QoS
encapsulation dot1q 8
ip address ...
service-policy output cust-qos
Since the internet access is 256K, I've configured shape average 256000.
My problem is that, during high congestion at internet access, I noticed that on cust-hub my VoIP SIP is having problem to ring to another VoIP SIP within the same hub. Is it because of the shape command ?
shape average 256000 is to much. The point is, that you have OSI layer2 overhead and layer2 keepalives and such. Lower it to f.e. 240000. You might need to "play" a little with the parameter, as the overhaed depends on average packet size.
Also make sure, that your SIP traffic is marked with af31. Just as a note: Cisco changed from marking voip signaling with af31 to cs3. Take a sniffer and check that proper markings are in place for voip signaling. Or just try
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