Network QoS Policies
Quality of Service Guide 129
prec
Syntax prec ip-prec-value [fc fc-name] [profile {in | out}]
no prec ip-prec-value
Context configure>qos>network>egress
Description This command defines a specific IP Precedence value that must be matched to perform the associated
reclassification actions. If an egress packet on the spoke-sdp the network QoS policy is applied to
matches the specified IP Precedence value, the forwarding class and profile may be overridden.
By default, the forwarding class and profile of the packet is derived from ingress classification and
profiling functions.
The IP Precedence bits used to match against the reclassification rules come from the Type of Service
(ToS) field within the IPv4 header or the Traffic Class field from the IPv6 header. If the packet does
not have an IP header, IP precedence based matching is not performed.
The IP precedence and DSCP based re-classification are only supported on a PW used in an IES or
VPRN spoke-interface. The CLI will block the application of a network QoS policy with the egress re-
classification commands to a network IP interface or to a spoke-sdp part of L2 service.
Conversely, the CLI will not allow the user to add the egress re-classification commands to a network
QoS policy if it is being used by a network IP interface or a L2 spoke-sdp.
Also, the egress re-classification commands will only take effect if the redirection of the spoke-sdp to
use an egress port queue-group succeeds, i.e., the following CLI command succeeds:
— config>service>vprn>interface>spoke-sdp>egress>qos network-policy-id port-redirect-group
queue-group-name instance instance-id
— config>service>ies>interface>spoke-sdp>egress>qos network-policy-id port-redirect-group queue-
group-name instance instance-id
Reclassification will however occur regardless of whether the queue group instance exists or not on a
given egress network port.
When the redirection command fails in CLI, the PW will use the network QoS policy assigned to the
network IP interface. Since the network QoS policy applied to a network IP interface does not support
re-classification, the PW packets will not undergo re-classification.
The no version of this command removes the egress re-classification rule.
Parameters ip-prec-value — 0 to 7
fc fc-name — be|l2|af|l1|h2|ef|h1|nc
profile {in | out} — keywords - specify type of marking to be done.
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