Quality of Service (QoS) | 427
Honoring dot1p Values on Ingress Packets
FTOS provides the ability to honor dot1p values on ingress packets with the trust dot1p feature. To enable
trust dot1p, use the
trust dot1p command from POLICY-MAP-IN mode. Table 24-4 lists the queue to which
the classified traffic is sent based on the dot1p value.
The dot1p value is also honored for frames on the default VLAN. For more information, refer to
Priority-Tagged Frames on the Default VLAN.
Fall Back to trust diffserve or dot1p
When using QoS service policies with multiple class maps, you can configure FTOS to use the incoming
DSCP or dot1p marking as a secondary option for packet queuing in the event that no match occurs in the
class maps.
When class-maps are used, traffic is matched against each class-map sequentially from first to last. The
sequence is based on the priority of the rules, as follows:
1. rules with lowest priority, or in the absence of a priority configuration,
2. rules of the next numerically higher queue
By default, if no match occurs, the packet is queued to the default queue, Queue 0.
In the following configuration, packets are classified to queues using the three class maps:
Table 24-4. Default dot1p to Queue Mapping
dot1p Queue ID
00
10
20
31
42
53
63
73
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