Set the 802.1p field for host-generated traffic

On MPCs and Enhanced Queuing DPCs, you can now configure the IEEE 802.1p bits in the 802.1p field-also known as the Priority Code Point (PCP) field-in the Ethernet frame header for host outbound packets (control plane traffic). In earlier releases, this field is not configurable; instead it is set by CoS automatically for host outbound traffic.

To configure a global default value for this field for all host outbound traffic, include the default value statement at the [edit class-of-service host-outbound-traffic ieee-802.1] hierarchy level. This configuration has no effect on data plane traffic; you configure rewrite rules for these packets as always.

You cannot configure a default value for the 802.1p bits for host outbound traffic on a per-interface level. However, you can specify that the CoS 802.1p rewrite rules already configured on egress logical interfaces are applied to all host outbound packets on that interface. To do so, include the rewrite-rules statement at the [edit class-of-service host-outbound-traffic ieee-802.1] hierarchy level. This capability enables you to set only the outer tags or both the outer and the inner tags on dual-tagged VLAN packets.

(On Enhanced Queuing DPCs, both inner and outer tags must be set.)

This feature includes the following support:

• Address families-IPv4 and IPv6
• Interfaces-IP over VLAN demux, PPP over VLAN demux, and VLAN over Gigabit Ethernet
• Packet types-ARP, ANCP, DHCP, ICMP, IGMP, and PPP
• VLANs-Single and dual-tagged