Ingress And Egress Pw Statistics - Alcatel-Lucent 7950 Quality Of Service Manual

Network IP Interface Forwarding Class-Based Redirection

Ingress and Egress PW Statistics

The PW forwarded packet and octet statistics (SDP binding statistics) are currently supported for
both ingress and egress and are available via show command, monitor command, and accounting
file. These statistics consist of the ingress-forwarded and ingress-dropped packet and octet
counters, as well as the egress-forwarded packet and octet counters. However, they do not include
discards in the ingress network queues. The latter are counted in the stats of the queues defined in
the network-queue policy applied to the ingress of the MDA/FP.
Note the ingress and egress SDP binding stats do not count the label stack of the PW packet but
count the PW Control Word (CW) if included in the packet.
With the introduction of the PW shaping feature—the ingress or egress queue-group policer—a
PW FC is redirected to also provide packet and octet forwarded and dropped-statistics by means of
the show command, monitor command, and accounting file of the ingress or egress queue-group
instance.
Similar to the SDP binding stats, the ingress policer stats for a spoke-SDP does not count the label
stack. When the spoke-SDP is part of a L2-service, they will count the L2-encapsulation, minus
CRC and VLAN tag if popped out, and they also count the PW CW, if included in the packet.
When the spoke-SDP is part of a L3-service, the policer stats only count the IP payload and do not
count the PW CW. Unlike the ingress SDP binding stats, if the user enables the packet-byte-offset
{add bytes | subtract bytes} option under the queue-group policer, then the policer stats reflect the
adjusted packet size in both L2 and L3-spoke-SDPs.
The egress queue-group policer and/or queue counts the full label stack of the PW packet
including the CW. If the user enables the packet-byte-offset {add bytes | subtract bytes} option
under the queue-group policer and queue-group queue, then the policer and queue stats reflect the
adjusted packet size.
The SDP binding and queue-group statistics does however remain separate as one or more PWs
can have FCs redirected to the same policer ID in the queue-group instance.
Page 340 7950 XRS Quality of Service Guide