Quality of Service Guide QoS Shapers and Shaper QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 435
10.2.2 Applying a Shaper QoS Policy and Shaper Groups
A shaper QoS policy must be assigned to an Ethernet MDA for access ingress per-
customer aggregate shaping, or to a port for access egress per-customer aggregate
shaping. Once a shaper policy is assigned, a shaper group can be applied.
Shaper groups are created within the shaper policy and provide the per-customer
(MSS) aggregate shapers. The unshaped SAP shaper group within the policy
provides the shaper rate for all the unshaped SAPs (4-priority scheduled SAPs). For
each shaped SAP, an ingress or egress shaper group can be specified.
For ingress, the shaper group assigned to a SAP or unshaped shaper group must be
a shaper group from the shaper policy assigned to the Ethernet MDA.
For egress, the shaper group assigned to a SAP or unshaped shaper group must be
a shaper group from the shaper policy assigned to the port.
All ingress shaped or unshaped SAPs configured with the same ingress shaper
group on an Ethernet MDA have their aggregate traffic shaped at the shaper group
rate. Similarly, all the egress shaped or unshaped SAPs configured with the same
egress shaper group on a port have their aggregate traffic shaped at the shaper
group rate.
On all 7705 SAR fixed platforms (with the exception of the 7705 SAR-X), when a
shaper policy is assigned to an Ethernet MDA for access ingress aggregate shaping,
it is automatically assigned to all the Ethernet MDAs in that chassis. The shaper
group members contained in the shaper policy span all the Ethernet MDAs. SAPs on
different Ethernet MDAs configured with the same ingress shaper group will share
the shaper group rate.
For hybrid ports, one shaper policy can be applied to the network egress traffic as
well as to the access egress traffic. For network egress, all the shaped interfaces
(VLANs) and unshaped interfaces are bound to the default shaper group contained
in the shaper policy assigned to the network egress port. The access egress traffic
is bound to the shaper group assigned to each shaped SAP or to the default shaper
group if none is assigned, and all the unshaped SAPs are assigned to the unshaped
shaper group or to the default shaper group if none is assigned. Traffic is then
scheduled between the network and access shaper groups by ensuring that the CIR
rate for each shaper group is scheduled before any of the excess information rate
(EIR) traffic from any of the shaper groups.
Note: On the 8-port Ethernet Adapter card, version 2, shaped and unshaped VLANs are
arbitrated towards the port but egress-rate cannot be enabled.
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