Egress ACL Rate Limiting

The device supports egress port and ACL rate limiting. With egress ACL rate limiting, you can control the egress rate limit on a Layer 2 VLAN, a bridge domain, or an ACL.

Important

The egress ACL rate limiting feature is not supported on SLX 9150, SLX 9250, Extreme 8520, and Extreme 8720.

In general, you configure a rate limit profile by creating a QoS policy and associating it with a QoS class map. Under this rate limit profile, you configure the expected rate. Egress ACL rate limiting supports the following scheduling and shaping rules:

Eight priorities for each rate limit profile and strict priority for traffic in a rate limit profile (VLAN, BD, ACL).
Traffic with the same priority destined to the same port but belonging to a different rate limit profile is treated as round robin.
Traffic with different priorities destined to the same port but belonging to a different rate limit profile is treated as LOW (0-3) and HIGH (4-7). The device supports strict priority between HIGH and LOW.
All priority flows for a rate limit profile are under the same shaper. Each rate limit profile shaping rate is aggregated for all priorities.
Flows from all class maps, including normal traffic, are rate limited by the configured port rate.

Table 1. Supported network topology for unicast ingress and egress traffic
Ingress packets	Egress packets
Layer 2 port, VLAN or BD	Layer 2 port, VLAN or BD
VPLS	Layer 2 port, VLAN or BD

Note

A VPLS or VxLAN egress topology is not supported. Multicast traffic is not rate limited by the RL profile but it is rate limited by the port rate limit.