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Assigning a DSCP Policy on the Basis of the DSCP in IPv4, Packets Received from Upstream Devices

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Note Quality of Service (QoS): Managing Bandwidth More Effectively Using QoS Classifiers to Configure Quality of Service for Outbound Traffic Assigning a DSCP Policy on the Basis of the DSCP in IPv4 Packets Received from Upstream Devices The preceding section describes how to forward a policy set by an edge (or upstream) switch. This option changes a DSCP policy in an IPv4 packet by changing its IP ToS codepoint and applying the priority associated with the new codepoint. (A DSCP policy consists of a differentiated services codepoint and an associated 802.1p priority.) You can use this option concurrently with the diffserv 802.1p priority option (above), as long as the DSCPs specified in the two options do not match. To use this option to configure a change in policy: 1. Identify a DSCP used to set a policy in packets received from an upstream or edge switch. 2. Create a new policy by using qos dscp-map < codepoint > priority < 0 - 7 > to configure an 802.1p priority for the codepoint you will use to overwrite the DSCP the packet carries from upstream. (For more on this topic, refer to "Differentiated Services Codepoint (DSCP) Mapping" on page 5-33.) 3. Use qos type-of-service diff-services < incoming-DSCP > dscp < outgoingDSCP > to change the policy on packets coming from the edge or upstream switch with the specified incoming DSCP. (Figure 5-4 on page 5-17 illustrates this scenario.) On the switches covered in this guide, DSCP policies (codepoint re-marking) cannot be applied to outbound IPv4 packets having IP options. (The 802.1p priority in the VLAN tag is applied.) For more information on packet criteria and restrictions, refer to table 5-11 on page 5-41. Syntax: qos type-of-service diff-services Enables ToS diff-services. Syntax: qos type-of-service diff-services < current-codepoint > dscp < new-codepoint > Configures the switch to select an incoming IP packet carrying the and then use the to assign a new, previously configured DSCP policy to the packet. The policy overwrites the with the < new-codepoint > and assigns the 802.1p priority specified by the policy. (Use the qos dscp-map command to define the priority for the DSCPs-page 5-33.) Syntax: no qos type-of-service 5-21

Section	Page
Getting Started	15
Contents	15
Introduction	16
Conventions	16
Command Syntax Statements	16
Command Prompts	17
Screen Simulations	17
Configuration and Operation Examples	17
Keys	17
Sources for More Information	18
Getting Documentation From the Web	20
Online Help	20
Need Only a Quick Start?	22
IP Addressing	22
To Set Up and Install the Switch in Your Network	22
Physical Installation	22
Static Virtual LANs (VLANs)	24
Contents	24
Overview	26
Introduction	27
General VLAN Operation	27
Types of Static VLANs Available in the Switch	28
Terminology	29
Static VLAN Operation	30
VLAN Environments	31
VLAN Operation	32
Overlapping (Tagged) VLANs	33
Per-Port Static VLAN Configuration Options	35
VLAN Operating Rules	36
General Steps for Using VLANs	39
Multiple VLAN Considerations	40
Single Forwarding Database Operation	40
Example of an Unsupported Configuration and How To Correct It	42
Multiple Forwarding Database Operation	43
Configuring VLANs	44
Menu: Configuring Port-Based VLAN Parameters	44
CLI: Configuring Port-Based and Protocol-Based VLAN Parameters	50
Web: Viewing and Configuring VLAN Parameters	62
802.1Q VLAN Tagging	63
Special VLAN Types	68
VLAN Support and the Default VLAN	68
The Primary VLAN	68
The Secure Management VLAN	69
Voice VLANs	77
Effect of VLANs on Other Switch Features	78
Spanning Tree Operation with VLANs	78
IP Interfaces	79
VLAN MAC Address	79
Port Trunks	79
Port Monitoring	79
Jumbo Packet Support	80
VLAN Restrictions	80
GVRP	81
Contents	81
Overview	82
Introduction	83
General Operation	84
Per-Port Options for Handling GVRP “Unknown VLANs”	87
Per-Port Options for Dynamic VLAN Advertising and Joining	89
GVRP and VLAN Access Control	91
Advertisements and Dynamic Joins	91
Port-Leave From a Dynamic VLAN	91
Planning for GVRP Operation	92
Configuring GVRP On a Switch	93
Menu: Viewing and Configuring GVRP	93
CLI: Viewing and Configuring GVRP	94
Web: Viewing and Configuring GVRP	98
GVRP Operating Notes	98
Multiple Instance Spanning-Tree Operation	100
Contents	100
Overview	102
802.1s Multiple Spanning Tree Protocol (MSTP)	105
MSTP Structure	106
How MSTP Operates	108
Regions, Legacy STP and RSTP Switches, and the Common Spanning Tree (CST)	110
Terminology	112
Operating Rules	114
MSTP Compatibility with RSTP or STP	115
Configuring MSTP	116
Planning an MSTP Application	116
MSTP Configuration Overview	118
Configuring MSTP Operation Mode and Global Settings	120
Configuring MSTP Per-Port Parameters	125
Configuring MST Instance Parameters	134
Configuring MST Instance Per-Port Parameters	136
Enabling or Disabling Spanning Tree Operation	139
MSTP VLAN Configuration Enhancement	141
Displaying MSTP Statistics and Configuration	148
Displaying Global MSTP Status	149
Troubleshooting an MSTP Configuration	157
Displaying the Change History of Root Bridges	157
Displaying Debug Counters for All MST Instances	160
Displaying Debug Counters for One MST Instance	161
Displaying Debug Counters for Ports in an MST Instance	163
Field Descriptions in MSTP Debug Command Output	165
Troubleshooting MSTP Operation	168
Loop Protection	169
Configuring Loop Protection	170
Viewing Loop Protection Status	171
Quality of Service (QoS): Managing Bandwidth More Effectively	172
Contents	172
Introduction	174
Terminology	177
Overview	178
Classifiers for Prioritizing Outbound Packets	181
Preparation for Configuring QoS	182
Preserving 802.1p Priority	182
Steps for Configuring QoS on the Switch	182
Viewing the QoS Configuration	184
Using QoS Classifiers to Configure Quality of Service for Outbound Traffic	185
QoS IP Type-of-Service (ToS) Policy and Priority	186
QoS Source-Port Priority	198
Differentiated Services Codepoint (DSCP) Mapping	204
Default Priority Settings for Selected Codepoints	205
Notes on Changing a Priority Setting	207
QoS Queue Configuration	211
QoS Operating Notes and Restrictions	212
IP Multicast (IGMP) Interaction with QoS	214
Numerics	215
A	215
B	215
C	215
D	215
F	215
G	216
H	216
I	216
J	216
L	216
M	216
N	217
O	217
P	217
Q	217
R	217
S	217
T	219
U	219
V	220

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5-21

Quality of Service (QoS): Managing Bandwidth More Effectively

Using QoS Classifiers to Configure Quality of Service for Outbound Traffic

Assigning a DSCP Policy on the Basis of the DSCP in IPv4

Packets Received from Upstream Devices

The preceding section describes how to forward a policy set by an edge (or

upstream) switch. This option changes a DSCP policy in an IPv4 packet by

changing its IP ToS codepoint and applying the priority associated with the

new codepoint. (A DSCP policy consists of a differentiated services codepoint

and an associated 802.1p priority.) You can use this option concurrently with

the diffserv 802.1p priority option (above), as long as the DSCPs specified in

the two options do not match.

To use this option to configure a change in policy:

Identify a DSCP used to set a policy in packets received from an upstream

or edge switch.

Create a new policy by using

qos dscp-map <

codepoint

> priority < 0 - 7 >

configure an 802.1p priority for the codepoint you will use to overwrite

the DSCP the packet carries from upstream. (For more on this topic, refer

to “Differentiated Services Codepoint (DSCP) Mapping” on page 5-33.)

Use

qos type-of-service diff-services <

incoming-DSCP

> dscp <

outgoing-

DSCP

to change the policy on packets coming from the edge or upstream

switch with the specified incoming DSCP.

(Figure 5-4 on page 5-17 illustrates this scenario.)

Note

On the switches covered in this guide, DSCP policies (codepoint re-marking)

cannot be applied to outbound IPv4 packets having IP options. (The 802.1p

priority in the VLAN tag is applied.) For more information on packet criteria

and restrictions, refer to table 5-11 on page 5-41.

Syntax:

qos type-of-service diff-services

Enables ToS diff-services.

Syntax:

qos type-of-service diff-services <

current-codepoint

> dscp

new-codepoint

Configures the switch to select an incoming IP packet carry-

ing the

current-codepoint

and then use the <

new-codepoint

to assign a new, previously configured DSCP policy to the

packet. The policy overwrites the

current-codepoint

with the

new-codepoint

and assigns the 802.1p priority specified

by the policy. (Use the

qos dscp-map

command to define the

priority for the DSCPs—page 5-33.)

Syntax:

no qos type-of-service