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Troubleshooting MSTP Operation, Table 4-2.

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Multiple Instance Spanning-Tree Operation Troubleshooting an MSTP Configuration Field RST BPDUs Tx RST BPDUs Rx MST BPDUs Tx MST BPDUs Rx MSTI MSGs Tx MSTI MSGs Rx Description Number of (802.1w) RST BPDUs that are transmitted through the port. This counter is maintained by the CIST (default MST instance 0) on a per-port basis. Number of (802.1w) RST BPDUs that are received on the port. This counter is maintained by the CIST (default MST instance 0) on a per-port basis. Number of (802.1s) MST BPDUs that are transmitted through the port. This counter is maintained by the CIST (default MST instance 0) on a per-port basis. Number of (802.1s) MST BPDUs that are received on the port. This counter is maintained by the CIST (default MST instance 0) on a per-port basis. Number of times that a configuration message for a specific MSTI was encoded in (802.1s) MST BPDUs that are transmitted through the port. This counter is maintained on a per-MSTI per-port basis. Number of times that the MSTI detected a configuration message destined to the MSTI in (802.1s) MST BPDUs received on the port. This counter is maintained on a per-MSTI perport basis. Troubleshooting MSTP Operation Table 4-2. Troubleshooting MSTP Operation Problem Possible Cause Duplicate packets on a VLAN, or packets not The allocation of VLANs to MSTIs may not be identical among all arriving on a LAN at all. switches in a region. A switch intended to operate in a region does not receive traffic from other switches in the region. An MSTP switch intended for a particular region may not have the same configuration name or region revision number as the other switches intended for the same region. The MSTP configuration name (spanningtree config-name command) and MSTP configuration revision number (spanning-tree config-revision command) must be identical on all MSTP switches intended for the same region. Another possible cause is that the set of VLANs and VLAN ID-to-MSTI mappings (spanning-tree instance vlan command) configured on the switch may not match the set of VLANs and VLAN ID-to-MSTI mappings configured on other switches in the intended region. 4-69

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

4-69

Multiple Instance Spanning-Tree Operation

Troubleshooting an MSTP Configuration

Troubleshooting MSTP Operation

Table 4-2.

Troubleshooting MSTP Operation

RST BPDUs Tx

Number of (802.1w) RST BPDUs that are transmitted through the port. This counter is

maintained by the CIST (default MST instance 0) on a per-port basis.

RST BPDUs Rx

Number of (802.1w) RST BPDUs that are received on the port. This counter is maintained

by the CIST (default MST instance 0) on a per-port basis.

MST BPDUs Tx

Number of (802.1s) MST BPDUs that are transmitted through the port. This counter is

maintained by the CIST (default MST instance 0) on a per-port basis.

MST BPDUs Rx

Number of (802.1s) MST BPDUs that are received on the port. This counter is maintained

by the CIST (default MST instance 0) on a per-port basis.

MSTI MSGs Tx

Number of times that a configuration message for a specific MSTI was encoded in (802.1s)

MST BPDUs that are transmitted through the port. This counter is maintained on a per-MSTI

per-port basis.

MSTI MSGs Rx

Number of times that the MSTI detected a configuration message destined to the MSTI in

(802.1s) MST BPDUs received on the port. This counter is maintained on a per-MSTI per-

port basis.

Field

Description

Problem

Possible Cause

Duplicate packets on a VLAN, or packets not

arriving on a LAN at all.

The allocation of VLANs to MSTIs may not be identical among all

switches in a region.

A switch intended to operate in a region does

not receive traffic from other switches in the

region.

An MSTP switch intended for a particular region may not have the same

configuration name or region revision number as the other switches

intended for the same region. The MSTP configuration name (

spanning-

tree config-name

command) and MSTP configuration revision number

(

spanning-tree config-revision

command) must be identical on all MSTP

switches intended for the same region.

Another possible cause is that the set of VLANs and VLAN ID-to-MSTI

mappings (

spanning-tree instance vlan

command) configured on the

switch may not match the set of VLANs and VLAN ID-to-MSTI mappings

configured on other switches in the intended region.