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Lossless traffic with policer, Configuring qos, Configuring qos fundamentals – Brocade Network OS Administrator’s Guide v4.1.1 User Manual

Page 486

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Policer behavior for L2 and L3 control packets

TABLE 81

Protocol

Ingress Policer

Egress Policer

LLDP

Enabled if protocol is not enabled and disabled if protocol is enabled.

Disabled

LACP

Enabled if protocol is not enabled and disabled if protocol is enabled.

Disabled

STP

Enabled if protocol is not enabled and disabled if protocol is enabled.

Disabled

DOT1X

Enabled if protocol is not enabled and disabled if protocol is enabled.

Disabled

PIM

Disabled

Enabled

OSPF

Disabled

Enabled

IGMP

Disabled

Enabled

VRRP/VRRP-E

Disabled

Enabled

When a Layer 2 control protocol is not enabled on an interface, packets are dropped during ingress
and are subjected to ingress policing. Layer 3 control packets, irrespective of whether they are
protocol-enabled or not, will not be subject to ingress and egress policing.

Lossless traffic with Policer

The following are considerations for lossless traffic:

• Policing is applicable only for lossy traffic. Lossless traffic should not get policed. For port-based

policing, apply a policy-map to an interface even if PFC is configured on that interface. The CoS
value (priority) on which PFC is applied is excluded from being policed.

• Remapped priority values should not include lossless priorities. Do not remap lossy traffic priorities

to lossless traffic priorities and vice-versa.

• Policer attributes conform-set-tc and exceed-set-tc should not be set to a lossless traffic class.

Configuring QoS

The following sections discuss configuring QoS, including fundamentals, traffic class mapping,
congestion control, rate limiting, BUM storm control, scheduling, DCB QoS, Brocade VCS Fabric QoS,
policer functions, and Auto QoS.

Configuring QoS fundamentals

NOTE
Refer to

User-priority mapping

on page 472.

Lossless traffic with Policer

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Network OS Administrator’s Guide

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