we know that after issue Auto QOS command on router, it will perform a number of tasks which includes:
1, Classify the IP traffic with RTP and audio codec payload type (RFC 1890) as VoIP bearer traffic.
2, Mark VoIP bearer traffic with DSCP EF and VoIP signaling (control) traffic as AF31.
3, Map the Layer 3 marking to the corresponding Layer 2 marking if applicable.
4, Remark traffic that is marked DSCP EF or AF31 to DSCP 0 if the traffic is not classified as VoIP bearer or signaling (control) traffic.
5, Treat all other non-VoIP traffic types as best effort QoS (excluding control traffic such as routing protocol updates and BPDUs).
6, Put VoIP bearer traffic into a strict priority LLQ with guaranteed bandwidth to accommodate voice traffic.
7, Put VoIP control traffic into a non-priority queue with a minimum bandwidth guarantee to ensure no packet loss.
8, Enable LFI and compressed RTP (cRTP) for link speeds of less than 768 kbps.
but when I check on the router after issue the auto qos command I do not find any class map try to classify the RTP or control signal. I was expecting to see such as class-map RTP, match protocol RTP; policy-map RTP-VOICE, class RTP set dscp ef... etc... instead I see the following:
class-map match-any AutoQoS-VoIP-RTP-Trust
match ip dscp ef
!
class-map match-any AutoQoS-VoIP-Control-Trust
match ip dscp cs3
match ip dscp af31
without mark those packet with DSCP value at first place, how to match it. I can understand that some packet from switch might has COS value attached, but what about the traffic orignated from local router such as H323 singalling, if this is H323 Gateway. any suggestion?
