Was going thro one of the document on METRO QOS and came across 2 commands "mls qos trust cos pass-through dscp" and second one is "no mls qos rewrite ip dscp ".Can any please elaborate these commands and share difference between them.

When IP payload is taken out from one AC in IP (routed) interworking MPLS, is TTL touched or its is preserved !?

Layer 2 VPN is provided to one of my client who has Serial interface on one end and Ethernet on the other side.Using IP Interworking L2 circuit is provided.Unicast ping is working fine but unable to bring OSPF across this L2 circuit.OSPF remains in I...

Have been reading lots of QoS documents on Cisco site and few books.At times tocken are equated to Frames and at times they are equated to Packets.So when I apply a policer what exactly m I doing ? M I doing rate limiting of layer 2 traffic with head...