At access egress, where the network-wide QoS boundary is reached, there may be a requirement to mark or re-mark the CoS indicators to match customer requirements. Dot1p and DSCP marking and re-marking is supported at Ethernet access egress.
When dot1p re-marking is needed for a QinQ egress SAP, it may be necessary to use the qinq-mark-top-only command to indicate which qtag needs to have its dot1p bits re-marked. The qinq-mark-top-only command is found under the config>service context. Refer to the 7705 SAR Services Guide, 'VLL Services Command Reference”, for details.
Similar to access ingress for Ethernet, DSCP marking or re-marking is supported for untagged, single-tagged, or double-tagged Ethernet frames.
On Ipipe SAPs over an Ethernet VLAN, both dot1p and DSCP marking and re-marking is supported at access egress. On Ipipe SAPs over PPP/MLPPP, DSCP marking and re-marking is supported at access egress. DSCP re-marking is supported for Ipipes using FR or cHDLC SAPS at the access egress.