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HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 139

Enabling or Disabling Spanning Tree Operation, Enabling an Entire MST Region at Once or

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Multiple Instance Spanning-Tree Operation Configuring MSTP Enabling or Disabling Spanning Tree Operation This command enables or disables spanning tree operation for any spanning tree protocol enabled on the switch. Before using this command to enable spanning tree, ensure that the version you want to use is active on the switch. Syntax: [no] spanning-tree Enabling spanning tree with MSTP configured implements MSTP for all physical ports on the switch, according to the VLAN groupings for the IST instance and any other configured instances. Disabling MSTP removes protection against redundant loops that can significantly slow or halt a network. This command simply turns spanning tree on or off. It does not change the existing spanning tree configuration. Note The convergence time for implementing MSTP changes can be disruptive to your network. To minimize such disruption, consider using the spanning-tree pending command (refer to the following section on "Enabling an Entire MST Region at Once or Exchanging One Region Configuration for Another"). Enabling an Entire MST Region at Once or Exchanging One Region Configuration for Another This operation exchanges the currently active MSTP configuration with the currently pending MSTP configuration. It enables you to implement a new MSTP configuration with minimal network disruption or to exchange MSTP configurations for testing or troubleshooting purposes. When you configure or reconfigure MSTP, the switch re-calculates the corresponding network paths. This can have a ripple effect throughout your network as adjacent MSTP switches recalculate network paths to support the configuration changes invoked in a single switch. Although MSTP employs rapid spanning-tree operation, the convergence time for implementing MSTP changes can be disruptive to your network. However, by using the spanningtree pending feature, you can set up an MSTP on the switch and then invoke all instances of the new configuration at the same time, instead of one at a time. 4-40

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

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Multiple Instance Spanning-Tree Operation

Configuring MSTP

Enabling or Disabling Spanning Tree Operation

This command enables or disables spanning tree operation for any spanning

tree protocol enabled on the switch. Before using this command to enable

spanning tree, ensure that the version you want to use is active on the switch.

Note

The convergence time for implementing MSTP changes can be disruptive to

your network. To minimize such disruption, consider using the

spanning-tree

pending

command (refer to the following section on “Enabling an Entire MST

Region at Once or Exchanging One Region Configuration for Another”).

Enabling an Entire MST Region at Once or

Exchanging One Region Configuration for Another

This operation exchanges the currently active MSTP configuration with the

currently pending MSTP configuration. It enables you to implement a new

MSTP configuration with minimal network disruption or to exchange MSTP

configurations for testing or troubleshooting purposes.

When you configure or reconfigure MSTP, the switch re-calculates the corre-

sponding network paths. This can have a ripple effect throughout your net-

work as adjacent MSTP switches recalculate network paths to support the

configuration changes invoked in a single switch. Although MSTP employs

rapid spanning-tree operation, the convergence time for implementing MSTP

changes can be disruptive to your network. However, by using the

spanning-

tree pending

feature, you can set up an MSTP on the switch and then invoke

all instances of the new configuration at the same time, instead of one at a time.

Syntax:

[no] spanning-tree

Enabling spanning tree with MSTP configured implements

MSTP for all physical ports on the switch, according to the

VLAN groupings for the IST instance and any other configured

instances. Disabling MSTP removes protection against

redundant loops that can significantly slow or halt a network.

This command simply turns spanning tree on or off. It does

not change the existing spanning tree configuration.