Cbs; Eir; Ebs; Example #1: Ingress Bandwidth Policer Per Uni - ADTRAN Total Access 5000 Deployment Manual

Total Access 5000 Business Services Deployment Guide

CBS

The CBS is the maximum available bytes for a burst of ingress traffic sent at the UNI speed
while still conforming to the CIR.

EIR

The EIR defines the average rate in kilobit per second (kbps) of service frames up to which the
network can deliver service frames but without an performance objectives. Service frames
allowed by the EIR are colored yellow.

EBS

The EBS is the maximum available bytes for a burst of ingress traffic sent at the UNI speed
while still conforming to the EIR.

Example #1: Ingress Bandwidth Policer per UNI

A single bandwidth policer can be applied to all ingress frames at a designated UNI. This type
of policer manages bandwidth non‐discriminately for all EVCs that are associated with the
UNI. Depending on the configuration and traffic conditions during periods of congestion,
some EVCs get more bandwidth while others get less bandwidth if multiple EVCs are
associated with the UNI.
Consider the conditions of "Example #1: Two CE‐VLANs Mapped to Two EVCs" on page F‐
10, where traffic for two customer VLANs is received at the same UNI port and mapped to
two different EVCs.
The following policer would collectively apply to all frames that ingress at Ethernet 1/0/1 (for
example, the two customer VLANs). The policer would give a total of 5Mbps with 2Mbps
considered green and 3Mbps considered yellow.
Policer #1:
• CIR/EIR Coupling = Disabled
• Committed Information Rate (CIR) = 2000 kbps
• Excess Information Rate (EIR) = 3000 kbps
• Committed Burst Size (CBS) = 3125 bytes
• Excess Burst Size (EBS) = 12500 bytes
• Mode = Per UNI
• UNI = Ethernet 1/0/1
Policer #1 is applied to ingress traffic of both EVC‐map #1 and EVC‐map #2 because these EVC
maps have Ethernet 1/0/1 defined as the UNI port.

Example #2: Ingress Bandwidth Policer per EVC

A single bandwidth policer can be applied to all ingress frames that are mapped to a desig‐
nated EVC. If traffic is mapped from a UNI to two EVCs, then one policer can be defined for
each EVC.
Consider the conditions of "Example #1: Two CE‐VLANs Mapped to Two EVCs" on page F‐
10, where two customer VLANs are received at the same UNI port and mapped to two
different EVCs.
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