Related Documentation
Policer Bandwidth and Burst-Size Limits
Table 1 lists each of the Junos OS policer types supported. For each policer type, the table summarizes the bandwidth limits and burst-size limits used to rate-limit traffic.
Table 1: Policer Bandwidth Limits and Burst-Size Limits
Policer Type | Bandwidth Limits | Burst-Size Limits |
|---|---|---|
| Single-Rate Two-Color Policer | ||
Defines a single rate limit: a bandwidth limit and an allowed burst size for conforming traffic. For a single-rate two-color policer only, you can specify the bandwidth limit as a percentage value from 1 through 100 instead of as an absolute number of bits per second. The effective bandwidth limit is calculated as a percentage of either the physical interface media rate or the logical interface configured shaping rate. | bandwidth-limit bps; M, MX, T Series routers and
EX Series switches: | burst-size-limit bytes; M, MX, T Series routers, and
EX Series switches: |
bandwidth-percent 1..100 percent | ||
| Single-Rate Three-Color Policer | ||
Defines a single rate limit: a bandwidth limit and an allowed burst size for conforming traffic. Also defines a second, larger burst size. This second burst size is used to differentiate between two categories of nonconforming traffic (yellow or red). | committed-information-rate bps; M, MX, T Series routers, and
EX Series switches: | committed-burst-size bytes; M, MX, T Series routers, and
EX Series swiches: |
excess-burst-size bytes; M, MX, T Series routers, and
EX Series switches: | ||
| Two-Rate Three-Color Policer | ||
Defines a committed rate limit: a bandwidth limit and an allowed burst size for conforming traffic. Also defines a peak rate limit: a second, larger burst size and a second, higher bandwidth limit. These additional rate-limit components are used to differentiate between two categories of nonconforming traffic (yellow or red). | committed-information-rate bps; M, MX, T Series routers, and
EX Series switches: | committed-burst-size bytes; M, MX, T Series routers, and
EX Series switches: |
peak-information-rate bps; M, MX, T Series routers, and
EX Series swiches: | peak-burst-size bytes; M, MX, T Series routers, and
EX Series switches: | |
| Hierarchical Policer | ||
Defines two policers, each with a bandwidth limit and an allowed burst size for conforming traffic. Different policing actions are applied based on whether the packets are classified for expedited forwarding (EF) or for a lower priority. Rate-limits ingress Layer 2 traffic at a SONET physical or logical interface hosted on supported routing platforms only. | bandwidth-limit bps; M40e, M120, and M320 (with FFPC and SFPC) edge
routers and T320, T640, and T1600 core routers with Enhanced Intelligent
Queuing (IQE) PICs: | burst-size-limit bytes; M40e, M120, and M320 (with FFPC and SFPC) edge
routers and T320, T640, and T1600 core routers with Enhanced Intelligent
Queuing (IQE) PICs: |
