Overview
78 Quality of Service Guide
Network policy-id 1 exists as the default policy that is applied to all network interfaces by
default. The network policy-id 1 cannot be modified or deleted. It defines the default DSCP-
to-FC mapping and MPLS EXP-to-FC for the ingress. For the egress, it defines six
forwarding classes which represent individual queues and the packet marking criteria.
New (non-default) network policy parameters can be modified. The no form of the command
reverts the object to the default values. A new network policy must include the definition of
at least one queue and specify the default-action. Incomplete network policies cannot be
applied to network interfaces.
Changes made to a policy are applied immediately to all network interface where the policy
is applied. For this reason, when a policy requires several changes, it is recommended that
you copy the policy to a work area policy-id. The work-in-progress copy can be modified
until all the changes are made and then the original policy-id can be overwritten with the
config qos copy command.
For information about the tasks and commands necessary to access the command line
interface and to configure and maintain your router devices, refer to CLI Usage chapter in the
Basic System Configuration Guide.
Network Ingress Tunnel QoS Override
For Tunnel Terminated IP Routing Decisions
This section describes a mechanism that provides the ability to ignore the network ingress
QoS mapping of a terminated tunnel containing an IP packet that is to be routed to a base
router or VPRN destination. This is advantageous when the mapping for the tunnel QoS
marking does not accurately or completely reflect the required QoS handling for the IP routed
packet. When the mechanism is enabled on an ingress network IP interface, the IP interface
will ignore the tunnel’s QoS mapping and derive the internal forwarding class and profile
based on the precedence or DiffServe Code Point (DSCP) values within the routed IP header
ToS field compared to the Network QoS policy defined on the IP interface.
Normal QoS Operation
The following types of QoS mapping decisions are applicable on a network ingress IP
interface.
• Ethernet dot1p value mapping (if defined)
• Default QoS mapping
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