Dscp Marking; Table 23: Dscp/Fc Marking - Alcatel-Lucent 7750 SR Manual

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VPRN Features

DSCP Marking

Specific DSCP, forwarding class, and Dot1P parameters can be specified to be used by every

protocol packet generated by the node. This enables prioritization or de-prioritization of every

protocol (as required). The markings effect a change in behavior on ingress when queuing. For

example, if OSPF is not enabled, then traffic can be de-prioritized to best effort (be) DSCP. This

change de-prioritizes OSPF traffic to the CPU complex.

DSCP marking for internally generated control and management traffic by marking the DSCP

value should be used for the given application. This can be configured per routing instance. For

example, OSPF packets can carry a different DSCP marking for the base instance and then for a

VPRN service. ISIS and ARP traffic is not an IP-generated traffic type and is not configurable.

When an application is configured to use a specified DSCP value then the MPLS EXP, Dot1P bits

will be marked in accordance with the network or access egress policy as it applies to the logical

interface the packet will be egressing.

The DSCP value can be set per application. This setting will be forwarded to the egress IOM. The

egress IOM does not alter the coded DSCP value and marks the LSP-EXP and IEEE 802.1p

(Dot1P) bits according to the appropriate network or access QoS policy.

MPLS (LSP ping,

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