Cabletron Systems SmartSwitch manual Monitoring QoS, Limiting Traffic Rate, Show all IP QoS flows

Chapter 19: QoS Configuration Guide

and the ToS field set to 7. (In this example, the MBZ bit is included in the ToS field.) The figure below shows how the parameter values are derived.

Incoming Packet:		0	1	0	0	0		1		1	1
	ToS Precedence = 2						ToS		= 7

<tos> = 71

Mask (look at all bits):

Rewritten ToS byte for 10.10.10.0/24 packet:

1 1 1 1 1 1 1 1

1 0 1 1 1 1 1 0

<tos-mask> = 255

<tos-precedence-rewrite> = 5 <tos-rewrite> = 30

ToS Precedence = 5 ToS = 30

The <tos-mask> value determines the ToS bit to be examined, which is all eight bits in this example. The following command configures the ToS rewrite for the example:

ssr(config)# qos set ip tos30to7 low 10.10.10.0/24 any any any 71 any any 255 5 30

Monitoring QoS

The SSR provides display of QoS statistics and configurations contained in the SSR.

To display QoS information, enter the following commands in Enable mode:

Show all IP QoS flows.	qos show		ip
Show all IPX QoS flows.	qos	show	ipx
Show all Layer-2 QoS flows.	qos	show	l2 all-destination all-flow
		ports <port-list>vlan <vlanID> source-mac
		<MACaddr> dest-mac<MACaddr>

Limiting Traffic Rate

Note: Some commands in this facility require updated SSR hardware. Please refer to the Release Notes for details.

Traffic rate limiting provides the ability to control the usage of a fundamental network resource, bandwidth. It allows you to limit the rate of traffic that flows through the specified interfaces, thus reserving bandwidth for critical applications. Unlike traffic

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