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ToS Option, Table 5-7., How the Switch Uses the ToS Configuration

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Quality of Service (QoS): Managing Bandwidth More Effectively Using QoS Classifiers to Configure Quality of Service for Outbound Traffic Table 5-7. How the Switch Uses the ToS Configuration Outbound Port ToS Option: 802.1p (Value = 0 - 7) Differentiated Services IP Packet Sent Out Depending on the value of the IP For a given packet carrying a ToS codepoint that the switch an Untagged Port Precedence bits in the packet's ToS has been configured to detect: in a VLAN field, the packet will go to one of four • Change the codepoint according to the configured policy outbound port queues in the switch: and assign the 802.1p priority specified for the new 1-2 = low priority (queue 1) codepoint in the DSCP Policy Table (page 5-33). • Do not change the codepoint, but assign the 802.1p priority 0-3 = normal priority (queue 2) specified for the existing codepoint in the DSCP Policy Table (page 5-33). 4-5 = medium priority (queue 3) Depending on the 802.1p priority used, the packet will leave the switch through one of the following queues: 6-7 = high priority (queue 4) 1 - 2 = low priority (queue 1) 0 - 3 = normal priority (queue 2) 4 - 5 = medium priority (queue 3) 6 - 7 = high priority (queue 4) If No-override (the default) has been configured for a specified codepoint, then the packet is not prioritized by ToS and, by default, is sent to the "normal priority" queue. IP Packet Sent Out Same as above, plus the IP Prece- Same as above, plus the Priority value (0 - 7) will be used to an Untagged Port dence value (0 - 7) will be used to set set a corresponding 802.1p priority in the VLAN tag carried by in a VLAN a corresponding 802.1p priority in the the packet to the next downstream device. Where No-over- VLAN tag carried by the packet to the ride is the assigned priority, the VLAN tag carries a "0" (normal next downstream device. Refer to priority) 802.1p setting if not prioritized by other QoS classi- table 5-8, below. fiers. Table 5-8. ToS IP-Precedence Bit Mappings to 802.1p Priorities ToS Byte IP Corresponding Service Priority Level Precedence Bits 802.1p Priority 000 1 Lowest 001 2 Low 002 0 Normal 003 3 004 4 005 5 006 6 007 7 Highest 5-26

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

Match case Limit results 1 per page

5-26

Quality of Service (QoS): Managing Bandwidth More Effectively

Using QoS Classifiers to Configure Quality of Service for Outbound Traffic

Table 5-7.

How the Switch Uses the ToS Configuration

Table 5-8.

ToS IP-Precedence Bit Mappings to 802.1p Priorities

Outbound Port

ToS Option:

802.1p (Value = 0 - 7)

Differentiated Services

IP Packet Sent Out

an Untagged Port

in a VLAN

Depending on the value of the IP

Precedence bits in the packet’s ToS

field, the packet will go to one of four

outbound port queues in the switch:

1-2 = low priority (queue 1)

0-3 = normal priority (queue 2)

4-5 = medium priority (queue 3)

6-7 = high priority (queue 4)

For a given packet carrying a ToS codepoint that the switch

has been configured to detect:

•

Change the codepoint according to the configured policy

and assign the 802.1p priority specified for the new

codepoint in the DSCP Policy Table (page 5-33).

•

Do not change the codepoint, but assign the 802.1p priority

specified for the existing codepoint in the DSCP Policy

Table (page 5-33).

Depending on the 802.1p priority used, the packet will leave

the switch through one of the following queues:

1 - 2 = low priority (queue 1)

0 - 3 = normal priority (queue 2)

4 - 5 = medium priority (queue 3)

6 - 7 = high priority (queue 4)

No-override

(the default) has been configured for a

specified codepoint, then the packet is not prioritized by ToS

and, by default, is sent to the “normal priority” queue.

IP Packet Sent Out

an Untagged Port

in a VLAN

Same as above, plus the IP Prece-

dence value (0 - 7) will be used to set

a corresponding 802.1p priority in the

VLAN tag carried by the packet to the

next downstream device. Refer to

table 5-8, below.

Same as above, plus the Priority value (0 - 7) will be used to

set a corresponding 802.1p priority in the VLAN tag carried by

the packet to the next downstream device. Where

No-over-

ride

is the assigned priority, the VLAN tag carries a “0” (normal

priority) 802.1p setting if not prioritized by other QoS classi-

fiers.

ToS Byte IP

Precedence Bits

Corresponding

802.1p Priority

Service Priority Level

000

Lowest

001

Low

002

Normal

003

004

005

006

007

Highest