This section provides information on per-VLAN network egress shapers for Gen-2 adapter cards and platforms. For information on Gen-3 adapter cards and platforms, see QoS for Gen-3 Adapter Cards and Platforms.
The 7705 SAR supports a set of eight network egress queues on a per-port or on a per-VLAN basis for network Ethernet ports. Eight unique per-VLAN CoS queues are created for each VLAN when a per-VLAN shaper is enabled. When using per-VLAN shaper mode, in addition to the per-VLAN eight CoS queues, there is a single set of eight queues for hosting traffic from all unshaped VLANs, if any. VLAN shapers are enabled on a per-interface basis (that is, per VLAN) when a network queue policy is assigned to the interface. See Per-VLAN Shaper Support for a list of cards and nodes that support per-VLAN shapers.
On a network port with dot1q encapsulation, shaped and unshaped VLANs can coexist. In such a scenario, each shaped VLAN has its own set of eight CoS queues and is shaped with its own configured dual-rate shaper. The remaining VLANs (that is, the unshaped VLANs) are serviced using the unshaped-if-cir rate, which is configured using the config>port>ethernet>network>egress>unshaped-if-cir command. Assigning a rate to the unshaped VLANs is required for arbitration between the shaped VLANs and the bulk (aggregate) of unshaped VLANs, where each shaped VLAN has its own shaping rate while the aggregate of the unshaped VLANs has a single rate assigned to it.
Per-VLAN shapers are supported on dot1q-encapsulated ports. They are not supported on null- or qinq-encapsulated ports.
Figure: Network Egress Shaped and Unshaped VLAN Queuing and Scheduling illustrates the queuing and scheduling blocks for network egress VLAN traffic.
