Catalyst 4500 Series Switch Cisco IOS Command Reference, 12.2(31)SG
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Table Of Contents

Symbols - Numerics - A - B - C - D - E - F - G - H - I - J - L - M - N - O - P - Q - R - S - T - U - V -



$ matches the end of a string 1-7

( ) in commands 1-10

* matches 0 or more sequences of a pattern 1-7

+ matches 1 or more sequences of a pattern 1-7

. matches any single character 1-7

? command 1-1

? matches 0 or 1 occurrence of a pattern 1-7

^ matches the beginning of a string 1-7

_ matches a comma (,), left brace ({), left parenthesis 1-7

" 1-10


10-Gigabit Ethernet uplink

selecting 2-125

showing the mode 2-340

802.1Q trunk ports and native VLANs 2-598

802.1Q tunnel ports

configuring 2-553

802.1S Multiple Spanning Tree

see MST


disabling port control 2-92

enabling port control 2-92

802.1X Critical Authentication

disabling on a port 2-93

disabling on a VLAN 2-96


disabling send success packets 2-94

enabling send success packets 2-94

enabling on a port 2-93

enabling on a VLAN 2-96

returning delay time to default setting 2-95

setting delay time on a port 2-95

802.1X Port Based Authentication

allowing multiple hosts on a port 2-103

debugging 802.1X Port Based Authentication 2-56

displaying port based authentication 2-326

enabling accounting for authentication sessions 2-3

enabling authentication on the system 2-108

enabling guest VLAN 2-97

enabling guest VLAN supplicant 2-90, 2-98

enabling manual control of auth state 2-104

enabling periodic re-authentication of the client 2-107

initializing re-authentication of dot1x ports 2-106

initializing state machines 2-99

receive session termination message upon reboot 2-4

setting maximum number for EAP requests 2-102

setting the reauthentication timer 2-109


abbreviating commands

context-sensitive help 1-1

Access Gateway Module

connecting to a module 2-12

connecting to a remote module 2-283

connecting to a specific remote module 2-293


displaying mac interface 2-412

show mode interface 2-297

access groups

IP 2-5

access lists

clearing an access template 2-28

defining ARP 2-11

displaying ARP information 2-300

See also ACLs, MAC ACLs, and VACLs

access maps

applying with VLAN filter 2-599


access-group mode 2-5

balancing hardware regions 2-8

determining ACL hardware programming 2-6

displaying mac access-group interface 2-412

using ACL naming conventions for MAC ACLs 2-198

action clause

specifying drop or forward action in a VACL 2-9

addresses, configuring a maximum 2-254


debugging the adjacency table 2-50

disabling the debug facility 2-50

displaying information about the adjacency table 2-298

displaying IPC table entries 2-50

aggregate policer

displaying information 2-458

aging time

displaying MAC address aging time 2-415

MAC address table 2-201


displaying operational status 2-329


description 1-9


description 1-10


access list, displaying detailed information 2-300

defining access-lists 2-11

ARP inspection

enforce certain types of checking 2-142

ARP packet

deny based on DHCP bindings 2-86

permit based on DHCP bindings 2-240


setting username 2-589

using an MD5-type encryption method 2-589

verifying MD5 signature 2-590

verifying the checksum for Flash memory 2-590

auth fail VLAN

enable on a port 2-91

set max number of attempts 2-90

authorization state

enabling manual control 2-104

authorization state of a controlled port 2-104

automatic installation

displaying status 2-301

auto-negotiate interface speed

example 2-544


configuring for VoIP 2-13

displaying configuration 2-302


baby giants

displaying the system MTU setting 2-483

setting the maximum Layer 2 payload size 2-572


displaying debugging messages 2-75

displaying spanning tree status 2-474

enabling debugging 2-75


store for DHCP snooping 2-151

BOOT environment variable

displaying information 2-306


displaying information 2-304


debugging spanning tree activities 2-74

bridge protocol data units


broadcast suppression level

configuring 2-545, 2-547

enabling 2-545, 2-547


cable diagnostics


displaying test results 2-307

testing conditions of copper cables 2-573

Catalyst 4507R 2-250

power redundancy mode 2-255


configuring tunneling encapsulation rate 2-188


neighbor information 2-309

enabling protocol tunneling for 2-184

set drop threshold for 2-186


displaying next-hop information 2-373

displaying VLAN configuration information 2-373


macro apply 2-209

Cisco Express Forwarding



macro apply 2-211


macro apply 2-213


macro apply 2-215

clear commands

clearing Gigabit Ethernet interfaces 2-26

clearing IGMP group cache entries 2-33

clearing interface counters 2-23

clearing IP access lists 2-28, 2-29

clearing IP ARP inspection statistics VLAN 2-30

clearing IP DHCP snooping database 2-31

clearing IP DHCP snooping database statistics 2-32

clearing MFIB counters and routes 2-36

clearing MFIB fastdrop entries 2-37

clearing PAgP channel information 2-42

clearing QoS aggregate counters 2-45

clearing VLAN interfaces 2-27

CLI string search

anchoring 1-10

expressions 1-7

filtering 1-6

multiple-character patterns 1-8

multipliers 1-9

parentheses for recall 1-10

searching outputs 1-6

single-character patterns 1-7

using 1-6

command modes

accessing privileged EXEC mode 1-4

exiting 1-4

understanding user EXEC and configuration modes 1-4

condition interface

debugging interface-related activities 2-52

condition vlan

debugging VLAN output 2-55

configuration, saving 1-11


root as secondary 2-528

configuring a SPAN session to monitor

limit SPAN source traffic 2-229

configuring forward delay 2-524

configuring root as primary 2-528



policy map to control plane 2-291


policy-map class information 2-438

entering configuration mode 2-48


service policy from control plane 2-291


assigning to Layer 2 protocol packets 2-185

CoS QoS default

defining value on an interface 2-268

Cost of Service

See QoS CoS


clearing interface counters 2-23



clear statistics 2-30


displaying qos dbl 2-459

enabling DBL globally on the switch 2-269

debug commands

debugging backup events 2-51

debugging DHCP snooping events 2-61

debugging DHCP snooping messages 2-62

debugging EtherChannel/PAgP/shim 2-57

debugging IPC activity 2-60

debugging IP DHCP snooping security messages 2-63

debugging NVRAM activities 2-66

debugging PAgP activities 2-67

debugging port manager activities 2-70

debugging software MAC filter updates 2-73

debugging spanning tree activities 2-74

debugging spanning tree backbonefast 2-75

debugging spanning tree UplinkFast 2-78

debugging supervisor redundancy 2-72

debugging VLAN manager activities 2-79

displaying monitor activity 2-65

displaying the adjacency table 2-50

enabling debug dot1x 2-56

enabling debugging messages for ISL VLAN IDs 2-81

enabling debugging messages for VTP 2-82

enabling debugging of UDLD activity 2-83

enabling switch shim debugging 2-76

enabling VLAN manager file system error tests 2-80

limiting debugging output for VLANs 2-55

limiting interface debugging output 2-52

limiting output for debugging standby state changes 2-53

shortcut to the debug condition interface 2-59


activity monitoring 2-65

DHCP snooping events 2-61

DHCP snooping packets 2-62

IPC activities 2-60

IP DHCP snooping security packets 2-63

NVRAM activities 2-66

PAgP activities 2-67

PAgP shim 2-57

PM activities 2-70

SMF address insertions and deletions 2-73

spanning tree BackboneFast events 2-75

spanning tree switch shim 2-76

spanning tree UplinkFast events 2-78

VLAN manager activities 2-79

VLAN manager IOS file system error tests 2-80

VTP protocol debug messages 2-82

debug spanning tree switch 2-76

debug sw-vlan vtp 2-82

default CoS value 2-268

default form of a command, using 1-6

defining egress DSCP-to-CoS mapping 2-273


clearing database statistics 2-32

DHCP bindings

configuring bindings 2-150

deny ARP packet based on matches 2-86

permit ARP packet based on matches 2-240

DHCP snooping

clearing database 2-31

displaying binding table 2-375

displaying configuration information 2-374

displaying status of DHCP database 2-378

displaying status of error detection 2-332

enabling DHCP globally 2-149

enabling IP source guard 2-182

enabling on a VLAN 2-157

enabling option 82 2-153, 2-154

enabling rate limiting on an interface 2-155

enabling trust on an interface 2-156

establishing binding configuration 2-150

renew binding database 2-285

store generated bindings 2-151

diagnostic test

bootup packet memory 2-320

displaying attributes 2-314

display module-based results 2-316

running 2-89

show results for TDR 2-307

testing conditions of copper cables 2-573

displaying error disable recovery 2-333

displaying inline power status 2-450

displaying monitoring activity 2-65

displaying SEEPROM information

GBIC 2-341

displaying SPAN session information 2-482, 2-546

document conventions xvi

document organization xv



attaching policy map to control plane 2-291

displaying policy-map class information 2-438

entering configuration mode 2-48

removing service policy from control plane 2-291


CoPP configuration mode 2-48

DOS attack

protecting system's resources 2-137

drop threshold, Layer 2 protocol tunneling 2-186

DSCP rewrite for IP packets

enable 2-276

dual-capable port

selecting a connector 2-226

duplex mode

configuring autonegotiation on an interface 2-111

configuring full duplex on an interface 2-111

configuring half duplex on an interface 2-111

dynamic ARP inspection

preventing 2-137

Dynamic Buffer Limiting


Dynamic Host Configuration Protocol




restarting authentication process 2-102

EIGRP (Enhanced IGRP)


routing updates, preventing 2-237


debugging for UDLD 2-83

voice VLANs 2-548


alarms 2-329

displaying information 2-329

status 2-329

temperature 2-329

erase a file 2-113

error disable detection

enabling error disable detection 2-116

error-disabled state

displaying 2-359

error disable recovery

configuring recovery mechanism variables 2-118

displaying recovery timer information 2-333

enabling ARP inspection timeout 2-118

specifying recovery cause 2-118


assigning interfaces to EtherChannel groups 2-17

debugging EtherChannel 2-57

debugging PAgP shim 2-57

debugging spanning tree activities 2-74

displaying information for a channel 2-334

removing interfaces from EtherChannel groups 2-17

EtherChannel guard

detecting STP misconfiguration 2-515

Explicit Host Tracking

clearing the database 2-35

enabling per-VLAN 2-169


matching multiple expression occurrences 1-9

multiple-character patterns 1-8

multiplying pattern occurrence 1-10

single-character patterns 1-7

Extensible Authentication Protocol



field replaceable unit (FRU)

displaying status information 2-329



routing updates, preventing 2-237

Flash memory file system

displaying file system information 2-304

verifying checksum 2-590

flow control

configuring a gigabit interface for pause frames 2-121

displaying per-interface statistics for flow control 2-338



displaying SEEPROM information 2-341

Gigabit Ethernet interface

clearing the hardware logic 2-26

Gigabit Ethernet uplink

selecting 2-125

showing the mode 2-340

global configuration mode

using 1-5


hardware module

resetting a module by toggling the power 2-124

hardware uplink

selecting the mode 2-125

showing the mode 2-340

helper addresses, IP 2-391

hot standby protocol

debugging 2-53

disabling debugging 2-53

limiting output 2-53



displaying SEEPROM information

chassis 2-341

clock module 2-341

fan trays 2-341

module 2-341

mux buffer 2-341

power supplies 2-341

supervisor engine 2-341

ifIndex persistence

clearing SNMP ifIndex commands 2-503

compress SNMP ifIndex table format 2-508

disabling globally 2-507

disabling on an interface 2-504

enabling globally 2-507

enabling on an interface 2-504


applying filters for host joining on Layer 2 interfaces 2-159

clearing IGMP group cache entries 2-33

configuring frequency for IGMP host-query messages 2-162

creating an IGMP profile 2-161

displaying IGMP interface configuration information 2-380

displaying profiles 2-381

setting maximum group numbers 2-160

IGMP profiles

displaying 2-381

IGMP snooping

clearing the EHT database 2-35

configuring a Layer 2 interface as a group member 2-173

configuring a Layer 2 interface as a multicast router 2-171

configuring a static VLAN interface 2-173

displaying multicast information 2-388

displaying VLAN information 2-382, 2-386, 2-389

enabling 2-164

enabling immediate-leave processing 2-170

enabling on a VLAN 2-168

enabling per-VLAN Explicit Host Tracking 2-169


enabling 2-505

inline power

displaying inline power status 2-450

inspection log

clearing log buffer 2-29


displaying suppressed multicast bytes 2-353

interface capabilities

displaying 2-350

interface configuration mode

summary 1-5

interface link

display cable disconnect time 2-356


configuring dot1q tunnel ports 2-553

creating an interface-range macro 2-85

debugging output of interface related activities 2-52

displaying description 2-355

displaying error-disabled state 2-359

displaying information when tunneling is enabled 2-406

displaying status 2-355

displaying traffic for a specific interface 2-347

entering interface configuration mode 2-129

executing a command on multiple ports in a range 2-132

selecting an interface to configure 2-129

setting a CoS value for Layer 2 packets 2-185

setting drop threshold for Layer 2 packets 2-186

setting the interface type 2-553

interface speed

configuring interface speed 2-542

interface transceiver

displaying diagnostic data 2-362

internal VLAN allocation

configuring 2-600

default setting 2-600

displaying allocation information 2-494

Internet Group Management Protocol



applying ARP ACL to VLAN 2-135

clearing inspection statistics 2-30

clearing status of log buffer 2-29

controlling packet logging 2-145

enabling dynamic inspection 2-144

limit rate of incoming requests 2-137

set per-port config trust state 2-141

showing status of dynamic ARP inspection 2-369

showing status of log buffer 2-372


debugging IPC activities 2-60

IP DHCP Snooping

See DHCP snooping

IP header validation

disabling 2-181

enabling 2-181

IP interfaces

displaying usability status 2-390

IP multicast

displaying multicast routing table information 2-396

IP packets

enable DSCP rewrite 2-276

IP phone and standard desktop

enabling Cisco-recommended features 2-211

IP source binding

adding or deleting 2-178

displaying bindingstagging 2-401

IP source guard

debugging messages 2-63

displaying configuration and filters 2-402

enabling on DHCP snooping 2-182


Jumbo frames

enabling jumbo frames 2-233



deselecting channeling protocol 2-19

enabling LACP on an interface 2-19

setting channeling protocol 2-19

Layer 2

displaying ACL configuration 2-412

Layer 2 interface type

specifying a nontrunking, nontagged single VLAN interface 2-553

specifying a trunking VLAN interface 2-553

Layer 2 protocol ports

displaying 2-406

Layer 2 protocol tunneling error recovery 2-188

Layer 2 switching

enabling voice VLANs 2-548

modifying switching characteristics 2-548

Layer 2 traceroute

IP addresses 2-578

Layer 3 switching

displaying information about an adjacency table 2-298

displaying port status 2-360

displaying status of native VLAN tagging 2-360

link-status event messages


globally 2-192, 2-195

on an interface 2-193, 2-196


globally 2-192, 2-195

on an interface 2-193, 2-196

log buffer

show status 2-372


controlling IP ARP packets 2-145


MAC Access Control Lists



defining extended MAC access list 2-198

displaying MAC ACL information 2-491

naming an ACL 2-198

MAC address filtering

configuring 2-207

disabling 2-207

enabling 2-207

MAC address table

adding static entries 2-220

clearing dynamic entries 2-39, 2-41

configuring aging time 2-201

displaying dynamic table entry information 2-417

displaying entry count 2-416

displaying information 2-413

displaying interface-based information 2-419

displaying multicast information 2-421

displaying notification information 2-423

displaying protocol-based information 2-425

displaying static table entry information 2-427

displaying the MAC address aging time 2-415

displaying VLAN-based information 2-429

enabling authentication bypass 2-100

enabling notifications 2-205

learning in the protocol buckets 2-202

removing static entries 2-220

MAC address tables

adding static entries 2-207

deleting secure or specific addresses 2-43

disabling IGMP snooping on static MAC addresses 2-207

removing static entries 2-207

mac-address-table static 2-207

MAC address unicast filtering

dropping unicast traffic 2-207

macro global description command 2-219

macro keywords

help strings 2-2


adding a global description 2-219

cisco global 2-217

system-cpp 2-218

mapping secondary VLANs to MST instance 2-260

mapping VLAN(s) to an MST instance 2-127

match subcommand

accessing 2-21

maximum transmission unit (MTU)

displaying the system MTU setting 2-483

setting the maximum Layer 2 payload size 2-572


verifying MD5 signature 2-590

message digest 5

See MD5


clearing ip mfib counters 2-36

clearing ip mfib fastdrop 2-37

displaying all active MFIB routes 2-393

displaying MFIB fastdrop table entries 2-395

enabling IP MFIB fastdrops 2-175


access-group 2-5

show access-group interface 2-297

switching between PVST+, MST, and Rapid PVST 2-520

See also command modes

module password clearing 2-25

module reset

resetting a module by toggling the power 2-124

--More-- prompt

filter 1-6

search 1-7


designating the primary and secondary root 2-528

displaying MST protocol information 2-478

displaying region configuration information 2-478

displaying spanning tree information 2-478

entering MST configuration submode 2-522

setting configuration revision number 2-287

setting path cost and port priority for instances 2-521

setting the forward delay timer for all instances 2-524

setting the hello-time delay timer for all instances 2-525

setting the max-age timer for all instances 2-526

setting the MST region name 2-234

specifying the maximum number of hops 2-527

switching between PVST+ and Rapid PVST 2-520

using the MST configuration submode revision command 2-287

using the submode name command 2-234


displaying global MTU settings 2-483


enabling storm control 2-547

multicast/unicast packets

prevent forwarding 2-552

Multicast Forwarding Information Base


multiple-character patterns 1-8

multiple hosts on authorized port 2-103

Multiple Spanning Tree



native VLAN

controlling tagging of traffic 2-567

displaying ports eligible for native tagging 2-493

displaying ports eligible for tagging 2-493

enabling tagging on 802.1Q trunk ports 2-598

specifing the tagging of traffic 2-568


enabling NetFlow statistics 2-176

including infer fields in routing statistics 2-176


displaying CEF VLAN information 2-373

no form of a command, using 1-6


debugging NVRAM activities 2-66



pattern searches 1-7


packet forwarding

prevent unknown packets 2-552

packet memory failure

direct switch action upon detection 2-88

packet memory test

bootup, displaying results 2-320, 2-322

ongoing, displaying results 2-324


access-group mode 2-5

paging prompt

see --More-- prompt


clearing port channel information 2-42

debugging PAgP activity 2-67

deselecting channeling protocol 2-19

displaying port channel information 2-435

hot standby mode

returning to defaults 2-236

selecting ports 2-236

input interface of incoming packets

learning 2-235

returning to defaults 2-235

setting channeling protocol 2-19

parentheses 1-10


clearing on an intelligent line module 2-25

establishing enhanced password security 2-589

setting username 2-589


displaying route maps xvi

redistributing route maps xvi

PM activities

debugging 2-70

disabling debugging 2-70

Policy Based Routing


port, dual-capable

selecting the connector 2-226

Port Aggregation Protocol

See PAgP

port-based authentication

displaying debug messages 2-56

displaying statistics and status 2-326

enabling 802.1X 2-104

manual control of authorization state 2-104

multiple hosts on authorized port 2-103

periodic re-authentication

enabling 2-107

re-authenticating 802.1X-enabled ports 2-106

switch-to-client frame-retransmission number 2-102

port channel

accessing 2-131

creating 2-131

displaying information 2-435

load distribution method

resetting to defaults 2-244

setting 2-244

port range

executing 2-132

port security

debugging ports security 2-71

deleting secure or specific addresses 2-43

displaying settings for an interface or switch 2-445

enabling 2-555

filter source IP and MAC addresses 2-182

setting action upon security violation 2-555

setting the rate limit for bad packets 2-555

sticky port 2-555

Port Trust Device

displaying 2-460

power status

displaying inline power 2-450

displaying power status 2-450

power supply

configuring combined and redundant power on the Catalyst 4507R 2-250

configuring inline power 2-247

configuring power consumption 2-249

configuring power redundancy on the Catalyst 4507R 2-255

displaying the SEEPROM 2-341

setting inline power state 2-246

Private VLAN


privileged EXEC mode, summary 1-5


system 1-5

protocol tunneling

configuring encapsulation rate 2-188

disabling 2-184

displaying port information 2-406

enabling 2-184

setting a CoS value for Layer 2 packets 2-185

setting a drop threshold for Layer 2 packets 2-186


configuring isolated, primary, and community PVLANs 2-256

controlling tagging of native VLAN traffic 2-567

disabling sticky-ARP 2-179

displaying map information for VLAN SVIs 2-358

displaying PVLAN information 2-496

enabling interface configuration mode 2-553

enabling sticky-ARP 2-179

mapping VLANs to the same SVI 2-258

specifying host ports 2-553

specifying promiscuous ports 2-553


switching between PVST and MST 2-520



account Layer 2 encapsulation 2-263

attaching a policy-map to an interface 2-288

automatic configuration 2-13

clearing aggregate counters 2-45

configuring a QoS policy map 2-242

configuring auto 2-13

defining a named aggregate policer 2-265

defining default CoS value 2-268

defining ingress CoS-to-DSCP mapping 2-272

displaying aggregate policer information 2-458

displaying auto configuration 2-302

displaying class maps information 2-312

displaying configuration information 2-302

displaying configurations of policies 2-441

displaying policy map information 2-437, 2-444

displaying QoS information 2-457

displaying QoS map information 2-461

enabling global configuration mode 2-261

enabling per-VLAN QoS for a Layer 2 interface 2-279

enabling QoS on an interface 2-262

mapping DSCP values to transmit queues 2-273

mapping egress DSCP-to-CoS 2-273

mapping the DSCP-to-CoS value 2-273

setting the mapping of policed DSCP values 2-275

setting the trust state 2-277

specifying flow-based match criteria 2-222


configuring for tunneled Layer 2 protocol packets 2-185

defining default CoS value 2-268

qos dbl 2-269

question command 1-1

queueing information

displaying 2-460


Rapid PVST

switching between PVST and MST 2-520

re-authenticating 802.1X-enabled ports 2-106


periodic 2-107

set the time 2-109


restoring bindings across 2-150


accessing the main CPU 2-280

changing from active to standby supervisor engine 2-281

displaying information 2-463

displaying redundancy facility information 2-463

displaying RF client list 2-463

displaying RF operational counters 2-463

displaying RF states 2-463

enabling automatic synchronization 2-16

forcing switchover to standby supervisor engine 2-281

set the mode 2-227

synchronizing the route processor configurations 2-220

related documentation xv

remote SPAN


renew commands

ip dhcp snooping database 2-285

resetting PVLAN trunk

setting switchport to trunk 2-553

rj45 connector, selecting the connector 2-226

ROM monitor mode

summary 1-6

Route Processor Redundancy

See redundancy


set the redundancy mode 2-227


converting VLAN to RSPAN VLAN 2-284

displaying list 2-498


saving configuration changes 1-11

secure address, configuring 2-252

secure ports, limitations 2-556

set the redundancy mode 2-227

sfp connector, selecting the connector 2-226

show commands

filtering parameters 1-7

searching and filtering 1-6

show platform commands 1-11

Simple Network Management Protocol


single-character patterns

special characters 1-7


displaying information on the standby supervisor 2-470


displaying information about the system 2-472


debugging address insertions and deletions 2-73


debugging spanning tree activities 2-74

ifIndex persistence

clearing SNMP ifIndex commands 2-503

compress SNMP ifIndex table format 2-508

disabling globally 2-507

disabling on an interface 2-504

enabling globally 2-507

enabling on an interface 2-504


disabling 2-505

enabling 2-505


configuring to send when storm occurs 2-545

disabling 2-505

enabling 2-505


adding     1

removing     1

software MAC filter


SPAN commands

configuring a SPAN session to monitor 2-229

displaying SPAN session information 2-482, 2-546

SPAN enhancements

displaying status 2-433

Spanning Tree Protocol


SPAN session

displaying session information 2-433

filter ACLs 2-229

specify encap type 2-229

turn off host learning based on ingress packets 2-229

special characters

anchoring, table 1-10

SSO 2-227

standard desktop

enabling Cisco-recommended features 2-209

standard desktop and Cisco IP phone

enabling Cisco-recommended features 2-211

sticky address, configuring 2-253


disabling on PVLANs 2-179

enabling on PVLANs 2-179

sticky port

deleting 2-43

enabling security 2-555

storm control

configuring for action when storm occurs 2-545

disabling suppression mode 2-332

displaying settings 2-481

enabling 2-545

enabling broadcast 2-545, 2-547

enabling multicast 2-545, 2-547

enabling suppression mode 2-332

enabling timer to recover from error disable 2-118

enabling unicast 2-545, 2-547

multicast, enabling 2-547

setting high and low levels 2-545

setting suppression level 2-332


configuring link type for a port 2-518

configuring tunneling encapsulation rate 2-188

debugging all activities 2-74

debugging spanning tree activities 2-74

debugging spanning tree BackboneFast events 2-75

debugging spanning tree UplinkFast 2-78

detecting misconfiguration 2-515

displaying active interfaces only 2-474

displaying BackboneFast status 2-474

displaying bridge status and configuration 2-474

displaying spanning tree debug messages 2-74

displaying summary of interface information 2-474

enabling BPDU filtering by default on all PortFast ports 2-533

enabling BPDU filtering on an interface 2-511

enabling BPDU guard by default on all PortFast ports 2-535

enabling BPDU guard on an interface 2-513

enabling extended system ID 2-516

enabling loop guard as a default on all ports 2-519

enabling PortFast by default on all access ports 2-536

enabling PortFast mode 2-531

enabling protocol tunneling for 2-184

enabling root guard 2-517

enabling spanning tree BackboneFast 2-510

enabling spanning tree on a per VLAN basis 2-540

enabling spanning tree UplinkFast 2-538

setting an interface priority 2-537

setting drop threshold for 2-186

setting pathcost 2-514

setting the default pathcost calculation method 2-530

subinterface configuration mode, summary 1-6


creating a Layer 3 interface on a VLAN 2-134

switchport 2-568

switchport interfaces

displaying status of Layer 3 port 2-360

displaying status of native VLAN tagging 2-360

switch shim

debugging 2-76

disabling debugging 2-76

switch to router connection

enabling Cisco-recommended features 2-213

switch to switch connection

enabling Cisco-recommended features 2-215

switch virtual interface


sw-vlan 2-79

system prompts 1-5


Tab key

command completion 1-1


characters with special meaning 1-7

mac access-list extended subcommands 2-198

match syntax description 2-22

multipliers 1-9

relationship between duplex and speed commands 2-543

show cable-diagnostics tdr command output fields 2-308

show cdp neighbors detail field descriptions 2-311

show cdp neighbors field descriptions 2-310

show ip interface field descriptions 2-391

show policy-map control-plane field descriptions 2-440

show vlan command output fields 2-497

show vtp command output fields 2-501

special characters 1-9

special characters used for anchoring 1-10

speed command options 2-222, 2-542

valid interface types 2-129


displaying information useful to TAC 2-484


debugging spanning tree activities 2-74


displaying cable diagnostic test results 2-307

test condition of copper cables 2-573

temperature readings

displaying information 2-329

timer information 2-333

traffic shaping

enable on an interface 2-295

traps, enabling 2-505

trunk encapsulation

setting format 2-568

trunk interfaces

displaying trunk interfaces information 2-367

trust state

setting 2-141

tunnel ports

displaying information about Layer 2 protocol 2-406

TX queues

allocating bandwidth 2-581

returning to default values 2-581

setting priority to high 2-581

specifying burst size 2-581

specifying traffic rate 2-581



displaying administrative and operational status 2-486

enabling by default on all fiber interfaces 2-583

enabling on an individual interface 2-585

preventing a fiber interface from being enabled 2-585

resetting all shutdown ports 2-587

setting the message timer 2-583

Unidirectional Link Detection


unknown multicast traffic, preventing 2-552

unknown unicast traffic, preventing 2-552

user EXEC mode, summary 1-5


setting password and privilege level 2-589



access-group mode 2-5

applying VLAN access maps 2-599

displaying VLAN access map information 2-491

specifying an action in a VLAN access map 2-9

specifying the match clause for a VLAN access-map sequence 2-221

using a VLAN filter 2-599


applying an ARP ACL 2-135

configuring 2-592

converting to RSPAN VLAN 2-284

displaying CEF information 2-373

displaying CEF next-hop information 2-373

displaying information on switch interfaces 2-382, 2-386

displaying information on VLAN switch interfaces 2-389

displaying information sorted by group IP address 2-382, 2-386

displaying IP address and version information 2-382, 2-386

displaying Layer 2 VLAN information 2-488

displaying statistical information 2-431

displaying VLAN information 2-490

enabling dynamic ARP inspection 2-144

enabling Explicit Host Tracking 2-169

enabling guest per-port 2-97

enabling guest VLAN supplicant 2-90, 2-98

entering VLAN configuration mode 2-596

native frames

enabling tagging on all 802.1Q trunk ports 2-598

pruning the list for VTP 2-568

setting the list of allowed 2-568

VLAN Access Control Lists


VLAN access map


VLAN database

resetting 2-286

VLAN debugging

limiting output 2-55

VLAN manager

debugging 2-79

disabling debugging 2-79

IOS file system error tests

debugging 2-80

disabling debugging 2-80

VLAN Query Protocol


VLAN query protocol (VQPC)

debugging 2-84



counters 2-46

clearing hardware logic 2-27


internal allocation scheme 2-600


internal VLAN allocation information 2-494


entering VLAN configuration mode 2-596


configuring servers 2-604

reconfirming dynamic VLAN assignments 2-602

voice VLANs

enabling 2-548


configuring auto-QoS 2-13


per-server retry count 2-603

reconfirming dynamic VLAN assignments 2-602


configuring the administrative domain name 2-608

configuring the device in VTP client mode 2-607

configuring the device in VTP server mode 2-611

configuring the device in VTP transparent mode 2-612

configuring tunnel encapsulation rate 2-188

creating a VTP domain password 2-609

displaying domain information 2-500

displaying statistics information 2-500

enabling protocol tunneling for 2-184

enabling pruning in the VLAN database 2-610

enabling VTP version 2 mode 2-613

modifying the VTP configuration storage file name 2-606

set drop threshold for 2-186

VTP protocol code

activating debug messages 2-82

deactivating debug messages 2-82