Shaped VLANs have user-configured rate limits (PIR and CIR)—called the aggregate rate limits—and must use 16-priority scheduling mode. Shaped VLANs operate on a per-interface basis and are enabled after a network queue policy is assigned to the interface. If a VLAN does not have a network queue policy assigned to the interface, it is considered an unshaped VLAN.
To configure a shaped VLAN with aggregate rate limits, use the agg-rate-limit command in the config>router>if>egress context. If the VLAN shaper is not enabled, then the agg-rate-limit settings do not apply. The default aggregate rate limit (PIR) is set to the port egress rate.
Unshaped VLANs use default rate limits (PIR is the maximum possible port rate and CIR is 0 kb/s) and use 16-priority scheduling mode. All unshaped VLANs are classified, queued, buffered, and scheduled into an aggregate flow that gets prepared for third-tier arbitration by a single VLAN aggregate shaper.
In order for the aggregated unshaped VLANs to compete fairly for bandwidth with the shaped VLANs, a single, aggregate CIR for all the unshaped VLANs can be configured using the unshaped-if-cir command. The aggregate CIR is applied to all the unshaped VLANs as a group, not to individual VLANs, and is configured in the config>port>ethernet> network>egress context.