Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 103
Referring to Figure 21, at the port shaper, conforming (CIR) traffic has priority over
non-conforming traffic. The arbitration between the shaped VLANs and unshaped
VLANs is handled in the following priority order:
• committed traffic: the per-VLAN committed rate (CIR) for shaped VLANs as set
by the agg-rate-limit command, and the aggregate committed rate for all the
unshaped VLANs as set by the unshaped-if-cir command
• uncommitted traffic: the per-VLAN uncommitted rate (PIR) for shaped VLANs as
set by the agg-rate-limit command, and aggregate uncommitted rate for all the
unshaped VLANs as set by the unshaped-if-cir command
3.4.7 Network Egress Marking and Re-Marking
The EXP bit settings can be marked at network egress. The EXP bit markings of the
forwarding class are used for this purpose. The tunnel and pseudowire EXP bits are
marked to the forwarding class value.
The default network egress QoS marking settings are given in Table 24.
3.4.7.1 Network Egress Marking and Re-Marking on Ethernet ports
For MPLS tunnels, if network egress Ethernet ports are used, dot1p bit marking can
be enabled in conjunction with EXP bit marking. In this case, the tunnel and
pseudowire EXP bits do not have to be the same as the dot1p bits.
For GRE and IP tunnels, dot1p marking and pseudowire EXP marking can be
enabled, and DSCP marking can also be enabled.
Network egress dot1p is supported for Ethernet frames, which can carry IPv4, IPv6,
or MPLS packets. EXP re-marking is supported for MPLS packets.
Note: This section applies to Gen-2 adapter cards. For information on per-VLAN shapers
arbitration for Gen-3 adapter cards and platforms, such as the 6-port Ethernet 10Gbps
Adapter card and the 7705 SAR-X, see Figure 13 in the QoS for Gen-3 Adapter Cards and
Platforms section.
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