Catalyst 4500 Series Switch Cisco IOS Command Reference, 12.2(20)EW
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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


802.1Q trunk ports and native VLANs 2-503

802.1Q tunnel ports

configuring 2-462

802.1s Multiple Spanning Tree

see MST

802.1x Port Based Authentication

allowing multiple hosts on a port 2-86

debugging 802.1x Port Based Authentication 2-49

displaying port based authentication 2-256

enabling accounting for authentication sessions 2-3

enabling authentication on the system 2-91

enabling guest VLAN 2-82

enabling manual control of auth state 2-87

enabling periodic re-authentication of the client 2-90

initializing re-authentication of dot1x ports 2-89

initializing state machines 2-83

receive session termination message upon reboot 2-4

setting maximum number for EAP requests 2-85


abbreviating commands

context-sensitive help 1-1

Access Gateway Module

connecting to a module 2-11

connecting to a remote module 2-229

connecting to a specific remote module 2-235


displaying mac interface 2-336

show mode interface 2-239

access groups

IP 2-5

access lists

clearing an access template 2-26

defining ARP 2-10

displaying ARP information 2-240

See also ACLs, MAC ACLs, and VACLs

access maps

applying with VLAN filter 2-504


access-group mode 2-5

determining ACL hardware programming 2-6

displaying mac access-group interface 2-336

using ACL naming conventions for MAC ACLs 2-163

action clause

specifying drop or forward action in a VACL 2-8


debugging the adjacency table 2-43

disabling the debug facility 2-43

displaying IPC table entries 2-43

aggregate policer

displaying information 2-369

aging time

displaying MAC address aging time 2-339

MAC address table 2-166


displaying operational status 2-259


description 1-9


description 1-10


access list, displaying detailed information 2-240

defining access-lists 2-10

ARP inspection

enforce certain types of checking 2-118

ARP packet

deny based on DHCP bindings 2-79

permit based on DHCP bindings 2-190


setting username 2-494

using an MD5-type encryption method 2-494

verifying MD5 signature 2-495

verifying the checksum for Flash memory 2-495

authorization state

enabling manual control 2-87

authorization state of a controlled port 2-87

automatic installation

displaying status 2-241


configuring for VoIP 2-12

displaying configuration 2-242


baby giants

displaying the system MTU setting 2-394

setting the maximum Layer 2 payload size 2-479


displaying debugging messages 2-68

displaying spanning tree status 2-385

enabling debugging 2-68


store for DHCP snooping 2-126

BOOT environment variable

displaying information 2-246


displaying information 2-244


debugging spanning tree activities 2-67

bridge protocol data units


broadcast suppression level

configuring 2-454, 2-456

enabling 2-454, 2-456


Catalyst 4507R 2-199

power redundancy mode 2-201


configuring tunneling encapsulation rate 2-160

enabling protocol tunneling for 2-157

set drop threshold for 2-159


displaying next-hop information 2-300

displaying VLAN configuration information 2-300


macro apply 2-172

Cisco Express Forwarding



macro apply 2-174


macro apply 2-176


macro apply 2-178

clear commands

clearing Gigabit Ethernet interfaces 2-24

clearing IGMP group cache entries 2-31

clearing interface counters 2-21

clearing IP access lists 2-26, 2-27

clearing IP ARP inspection statistics VLAN 2-28

clearing IP DHCP snooping database 2-29

clearing IP DHCP snooping database statistics 2-30

clearing MFIB counters and routes 2-34

clearing MFIB fastdrop entries 2-35

clearing PAgP channel information 2-38

clearing QoS aggregate counters 2-40

clearing VLAN interfaces 2-25

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 2-45

condition vlan

debugging VLAN output 2-48

configuration, saving 1-11


root as secondary 2-437

configuring a SPAN session to monitor

limit SPAN source traffic 2-182

configuring forward delay 2-433

configuring root as primary 2-437


assigning to Layer 2 protocol packets 2-158

CoS QoS default

defining value on an interface 2-214

Cost of Service

See QoS CoS


clearing interface counters 2-21



clear statistics 2-28


displaying qos dbl 2-370

enabling DBL globally on the switch 2-215

debug commands

debugging backup events 2-44

debugging DHCP snooping events 2-54

debugging DHCP snooping messages 2-55

debugging EtherChannel/PAgP/shim 2-50

debugging IPC activity 2-53

debugging IP DHCP snooping security messages 2-56

debugging NVRAM activities 2-59

debugging PAgP activities 2-60

debugging port manager activities 2-63

debugging software MAC filter updates 2-66

debugging spanning tree activities 2-67

debugging spanning tree backbonefast 2-68

debugging spanning tree UplinkFast 2-71

debugging supervisor redundancy 2-65

debugging VLAN manager activities 2-72

displaying monitor activity 2-58

displaying the adjacency table 2-43

enabling debug dot1x 2-49

enabling debugging messages for ISL VLAN IDs 2-74

enabling debugging messages for VTP 2-75

enabling debugging of UDLD activity 2-76

enabling switch shim debugging 2-69

enabling VLAN manager file system error tests 2-73

limiting debugging output for VLANs 2-48

limiting interface debugging output 2-45

limiting output for debugging standby state changes 2-46

shortcut to the debug condition interface 2-52


activity monitoring 2-58

DHCP snooping events 2-54

DHCP snooping packets 2-55

IPC activities 2-53

IP DHCP snooping security packets 2-56

NVRAM activities 2-59

PAgP activities 2-60

PAgP shim 2-50

PM activities 2-63

SMF address insertions and deletions 2-66

spanning tree BackboneFast events 2-68

spanning tree switch shim 2-69

spanning tree UplinkFast events 2-71

VLAN manager activities 2-72

VLAN manager IOS file system error tests 2-73

VTP protocol debug messages 2-75

debug spanning tree switch 2-69

debug sw-vlan vtp 2-75

default CoS value 2-214

default form of a command, using 1-6

defining egress DSCP-to-CoS mapping 2-219


clearing database statistics 2-30

DHCP bindings

configuring bindings 2-125

deny ARP packet based on matches 2-79

permit ARP packet based on matches 2-190

DHCP snooping

clearing database 2-29

displaying 2-301

displaying binding table 2-302

displaying status of DHCP database 2-305

displaying status of error detection 2-262

enabling DHCP globally 2-124

enabling IP source guard 2-155

enabling on a VLAN 2-131

enabling option 82 2-128

enabling rate limiting on an interface 2-129

enabling trust on an interface 2-130

establishing binding configuration 2-125

renew binding database 2-231

store generated bindings 2-126

diagnostic test

display module-based results 2-248

displaying error disable recovery 2-263

displaying inline power status 2-364

displaying monitoring activity 2-58

displaying SEEPROM information

GBIC 2-270

displaying SPAN session information 2-393, 2-455

document conventions xvi

document organization xv

DOS attack

protecting system's resources 2-113

drop threshold, Layer 2 protocol tunneling 2-159

DSCP rewrite for IP packets

enable 2-222

duplex mode

configuring autonegotiation on an interface 2-94

configuring full duplex on an interface 2-94

configuring half duplex on an interface 2-94

dynamic ARP inspection

preventing 2-113

Dynamic Buffer Limiting


Dynamic Host Configuration Protocol




restarting authentication process 2-85


debugging for UDLD 2-76

voice VLANs 2-457


alarms 2-259

displaying information 2-259

status 2-259

temperature 2-259

error disable detection

enabling error disable detection 2-96

error-disabled state

displaying 2-286

error disable recovery

configuring recovery mechanism variables 2-98

displaying recovery timer information 2-263

enabling ARP inspection timeout 2-98

specifying recovery cause 2-98


assigning interfaces to EtherChannel groups 2-16

debugging EtherChannel 2-50

debugging PAgP shim 2-50

debugging spanning tree activities 2-67

displaying information for a channel 2-264

removing interfaces from EtherChannel groups 2-16

EtherChannel guard

detecting STP misconfiguration 2-424

Explicit Host Tracking

clearing the database 2-33

displaying host membership 2-313

enabling per-VLAN 2-142


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 2-259

Flash memory file system

displaying file system information 2-244

verifying checksum 2-495

flow control

configuring a gigabit interface for pause frames 2-101

displaying per-interface statistics for flow control 2-268



displaying SEEPROM information 2-270

Gigabit Ethernet interface

clearing the hardware logic 2-24

global configuration mode

using 1-5


hardware module

resetting a module by toggling the power 2-104

host membership on an interface

displaying information 2-313

hot standby protocol

debugging 2-46

disabling debugging 2-46

limiting output 2-46



displaying SEEPROM information

chassis 2-270

clock module 2-270

fan trays 2-270

module 2-270

mux buffer 2-270

power supplies 2-270

supervisor engine 2-270

ifIndex persistence

clearing SNMP ifIndex commands 2-413

compress SNMP ifIndex table format 2-418

disabling globally 2-417

disabling on an interface 2-414

enabling globally 2-417

enabling on an interface 2-414


applying filters for host joining on Layer 2 interfaces 2-133

clearing IGMP group cache entries 2-31

configuring frequency for IGMP host-query messages 2-136

creating an IGMP profile 2-135

displaying IGMP interface configuration information 2-307

displaying profiles 2-308

setting maximum group numbers 2-134

IGMP profiles

displaying 2-308

IGMP snooping

clearing the EHT database 2-33

configuring a Layer 2 interface as a group member 2-146

configuring a Layer 2 interface as a multicast router 2-144

configuring a static VLAN interface 2-146

displaying host membership 2-313

displaying multicast information 2-315

displaying VLAN information 2-309, 2-316

enabling 2-137

enabling immediate-leave processing 2-143

enabling on a VLAN 2-141

enabling per-VLAN Explicit Host Tracking 2-142


enabling 2-415

inline power

displaying inline power status 2-364

inspection log

clearing log buffer 2-27


displaying suppressed multicast bytes 2-280

interface capabilities

displaying 2-277

interface configuration mode

summary 1-5

interface link

display cable disconnect time 2-283


configuring dot1q tunnel ports 2-462

creating an interface-range macro 2-78

debugging output of interface related activities 2-45

displaying description 2-282

displaying error-disabled state 2-286

displaying information when tunneling is enabled 2-330

displaying status 2-282

displaying traffic for a specific interface 2-275

executing a command on multiple ports in a range 2-108

setting a CoS value for Layer 2 packets 2-158

setting drop threshold for Layer 2 packets 2-159

setting the interface type 2-462

interface speed

configuring interface speed 2-451

interface transceiver

displaying diagnostic data 2-289

internal VLAN allocation

configuring 2-505

default setting 2-505

displaying allocation information 2-404

Internet Group Management Protocol



applying ARP ACL to VLAN 2-111

clearing inspection statistics 2-28

clearing status of log buffer 2-27

controlling packet logging 2-121

enabling dynamic inspection 2-120

limit rate of incoming requests 2-113

set per-port config trust state 2-117

showing status of dynamic ARP inspection 2-296

showing status of log buffer 2-299


debugging IPC activities 2-53

IP DHCP Snooping

See DHCP snooping

IP header validation

disabling 2-154

enabling 2-154

IP multicast

displaying multicast routing table information 2-320

IP packets

enable DSCP rewrite 2-222

IP phone and standard desktop

enabling Cisco-recommended features 2-174

IP source binding

adding or deleting 2-151

displaying bindingstagging 2-325

IP source guard

debugging messages 2-56

displaying configuration and filters 2-326

enabling on DHCP snooping 2-155


Jumbo frames

enabling jumbo frames 2-186



deselecting channeling protocol 2-18

enabling LACP on an interface 2-18

setting channeling protocol 2-18

Layer 2

displaying ACL configuration 2-336

Layer 2 interface type

specifying a nontrunking, nontagged single VLAN interface 2-462

specifying a trunking VLAN interface 2-462

Layer 2 protocol ports

displaying 2-330

Layer 2 protocol tunneling error recovery 2-160

Layer 2 switching

enabling voice VLANs 2-457

modifying switching characteristics 2-457

Layer 2 traceroute

IP addresses 2-483

Layer 3 switching

displaying port status 2-287

displaying status of native VLAN tagging 2-287

log buffer

show status 2-299


controlling IP ARP packets 2-121


MAC Access Control Lists



defining extended MAC access list 2-163

displaying MAC ACL information 2-401

naming an ACL 2-163

MAC address filtering

configuring 2-170

disabling 2-170

enabling 2-170

MAC address table

adding static entries 2-180

clearing dynamic entries 2-37

configuring aging time 2-166

displaying dynamic table entry information 2-341

displaying entry count 2-340

displaying information 2-337

displaying interface-based information 2-343

displaying multicast information 2-345

displaying protocol-based information 2-347

displaying static table entry information 2-349

displaying the MAC address aging time 2-339

displaying VLAN-based information 2-351

learning in the protocol buckets 2-167

removing static entries 2-180

MAC address tables

adding static entries 2-170

deleting secure or specific addresses 2-39

disabling IGMP snooping on static MAC addresses 2-170

removing static entries 2-170

mac-address-table static 2-170

MAC address unicast filtering

dropping unicast traffic 2-170

macro keywords

help strings 2-2

mapping secondary VLANs to MST instance 2-206

mapping VLAN(s) to an MST instance 2-105

match subcommand

accessing 2-19

maximum transmission unit (MTU)

displaying the system MTU setting 2-394

setting the maximum Layer 2 payload size 2-479


verifying MD5 signature 2-495

message digest 5

See MD5


clearing ip mfib counters 2-34

clearing ip mfib fastdrop 2-35

displaying all active MFIB routes 2-317

displaying MFIB fastdrop table entries 2-319

enabling IP MFIB fastdrops 2-148


access-group 2-5

show access-group interface 2-239

switching between PVST+, MST, and Rapid PVST 2-429

See also command modes

module password clearing 2-23

module reset

resetting a module by toggling the power 2-104

--More-- prompt

filter 1-6

search 1-7


designating the primary and secondary root 2-437

displaying MST protocol information 2-390

displaying region configuration information 2-390

displaying spanning tree information 2-390

entering MST configuration submode 2-431

setting configuration revision number 2-233

setting path cost and port priority for instances 2-430

setting the forward delay timer for all instances 2-433

setting the hello-time delay timer for all instances 2-434

setting the max-age timer for all instances 2-435

setting the MST region name 2-187

specifying the maximum number of hops 2-436

switching between PVST+ and Rapid PVST 2-429

using the MST configuration submode revision command 2-233

using the submode name command 2-187


displaying global MTU settings 2-394


enabling storm control 2-456

multicast/unicast packets

prevent forwarding 2-461

Multicast Forwarding Information Base


multiple-character patterns 1-8

multiple hosts on authorized port 2-86

Multiple Spanning Tree



native VLAN

controlling tagging of traffic 2-475

displaying ports eligible for native tagging 2-403

displaying ports eligible for tagging 2-403

enabling tagging on 802.1Q trunk ports 2-503

specifing the tagging of traffic 2-476


enabling NetFlow statistics 2-149

including infer fields in routing statistics 2-149


displaying CEF VLAN information 2-300

no form of a command, using 1-6


debugging NVRAM activities 2-59



pattern searches 1-7


packet forwarding

prevent unknown packets 2-461

packet memory failure

direct switch action upon detection 2-81

packet memory test

bootup, displaying results 2-252

ongoing, displaying results 2-254


access-group mode 2-5

paging prompt

see --More-- prompt


clearing port channel information 2-38

debugging PAgP activity 2-60

deselecting channeling protocol 2-18

displaying port channel information 2-357

hot standby mode

returning to defaults 2-189

selecting ports 2-189

input interface of incoming packets

learning 2-188

returning to defaults 2-188

setting channeling protocol 2-18

parentheses 1-10


clearing on an intelligent line module 2-23

establishing enhanced password security 2-494

setting username 2-494


displaying route maps xvi

redistributing route maps xvi

PM activities

debugging 2-63

disabling debugging 2-63

Policy Based Routing


Port Aggregation Protocol

See PAgP

port-based authentication

displaying debug messages 2-49

displaying statistics and status 2-256

enabling 802.1X 2-87

manual control of authorization state 2-87

multiple hosts on authorized port 2-86

periodic re-authentication

enabling 2-90

re-authenticating 802.1X-enabled ports 2-89

switch-to-client frame-retransmission number 2-85

port channel

accessing 2-107

creating 2-107

displaying information 2-357

load distribution method

resetting to defaults 2-194

setting 2-194

port range

executing 2-108

port security

debugging ports security 2-64

deleting secure or specific addresses 2-39

enabling 2-464

filter source IP and MAC addresses 2-155

setting action upon security violation 2-464

setting the rate limit for bad packets 2-464

sticky port 2-464

Port Trust Device

displaying 2-371

power status

displaying inline power 2-364

displaying power status 2-364

power supply

configuring combined and redundant power on the Catalyst 4507R 2-199

configuring inline power 2-196

configuring power consumption 2-198

configuring power redundancy on the Catalyst 4507R 2-201

displaying the SEEPROM 2-270

setting inline power state 2-195

Private VLAN


privileged EXEC mode, summary 1-5


system 1-5

protocol tunneling

configuring encapsulation rate 2-160

disabling 2-157

displaying port information 2-330

enabling 2-157

setting a CoS value for Layer 2 packets 2-158

setting a drop threshold for Layer 2 packets 2-159


configuring isolated, primary, and community PVLANs 2-202

controlling tagging of native VLAN traffic 2-475

disabling sticky-ARP 2-152

displaying map information for VLAN SVIs 2-285

displaying PVLAN information 2-406

enabling interface configuration mode 2-462

enabling sticky-ARP 2-152

mapping VLANs to the same SVI 2-204

specifying host ports 2-462

specifying promiscuous ports 2-462


switching between PVST and MST 2-429



account Layer 2 encapsulation 2-209

attaching a policy-map to an interface 2-234

automatic configuration 2-12

clearing aggregate counters 2-40

configuring a QoS policy map 2-192

configuring auto 2-12

defining a named aggregate policer 2-211

defining default CoS value 2-214

defining ingress CoS-to-DSCP mapping 2-218

displaying aggregate policer information 2-369

displaying auto configuration 2-242

displaying class maps information 2-247

displaying configuration information 2-242

displaying configurations of policies 2-360

displaying policy map information 2-359

displaying QoS information 2-368

displaying QoS map information 2-372

enabling global configuration mode 2-207

enabling per-VLAN QoS for a Layer 2 interface 2-225

enabling QoS on an interface 2-208

mapping DSCP values to transmit queues 2-219

mapping egress DSCP-to-CoS 2-219

mapping the DSCP-to-CoS value 2-219

setting the mapping of policed DSCP values 2-221

setting the trust state 2-223


configuring for tunneled Layer 2 protocol packets 2-158

defining default CoS value 2-214

qos dbl 2-215

question command 1-1

queueing information

displaying 2-371


Rapid PVST

switching between PVST and MST 2-429

re-authenticating 802.1X-enabled ports 2-89


periodic 2-90


restoring bindings across 2-125


accessing the main CPU 2-226

changing from active to standby supervisor engine 2-227

displaying information 2-374

displaying redundancy facility information 2-374

displaying RF client list 2-374

displaying RF operational counters 2-374

displaying RF states 2-374

enabling automatic synchronization 2-15

forcing switchover to standby supervisor engine 2-227

synchronizing the route processor configurations 2-180

related documentation xv

remote SPAN


renew commands

ip dhcp snooping database 2-231

resetting PVLAN trunk

setting switchport to trunk 2-462

ROM monitor mode

summary 1-6

root guard

displaying root inconsistency status 2-385

Route Processor Redundancy

See redundancy


converting VLAN to RSPAN VLAN 2-230

displaying list 2-408


saving configuration changes 1-11

secure ports, limitations 2-465

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 2-381


displaying information about the system 2-383


debugging address insertions and deletions 2-66


debugging spanning tree activities 2-67

ifIndex persistence

clearing SNMP ifIndex commands 2-413

compress SNMP ifIndex table format 2-418

disabling globally 2-417

disabling on an interface 2-414

enabling globally 2-417

enabling on an interface 2-414


disabling 2-415

enabling 2-415


configuring to send when storm occurs 2-454

disabling 2-415

enabling 2-415

software MAC filter


SPAN commands

configuring a SPAN session to monitor 2-182

displaying SPAN session information 2-393, 2-455

SPAN enhancements

displaying status 2-355

Spanning Tree Protocol


SPAN session

displaying session information 2-355

filter ACLs 2-182

specify encap type 2-182

turn off host learning based on ingress packets 2-182

special characters

anchoring, table 1-10

standard desktop

enabling Cisco-recommended features 2-172

standard desktop and Cisco IP phone

enabling Cisco-recommended features 2-174


disabling on PVLANs 2-152

enabling on PVLANs 2-152

sticky port

deleting 2-39

enabling security 2-464

storm control

configuring for action when storm occurs 2-454

disabling suppression mode 2-262

displaying settings 2-392

enabling 2-454

enabling broadcast 2-454, 2-456

enabling multicast 2-454, 2-456

enabling suppression mode 2-262

enabling timer to recover from error disable 2-98

enabling unicast 2-454, 2-456

multicast, enabling 2-456

setting high and low levels 2-454

setting suppression level 2-262


configuring link type for a port 2-427

configuring tunneling encapsulation rate 2-160

debugging all activities 2-67

debugging spanning tree activities 2-67

debugging spanning tree BackboneFast events 2-68

debugging spanning tree UplinkFast 2-71

detecting misconfiguration 2-424

displaying active interfaces only 2-385

displaying BackboneFast status 2-385

displaying bridge status and configuration 2-385

displaying default path cost method 2-385

displaying spanning tree debug messages 2-67

displaying status information 2-385

displaying status per VLAN 2-385

displaying summary of interface information 2-385

displaying UplinkFast status 2-385

enabling BPDU filtering by default on all PortFast ports 2-442

enabling BPDU filtering on an interface 2-420

enabling BPDU guard by default on all PortFast ports 2-444

enabling BPDU guard on an interface 2-422

enabling extended system ID 2-425

enabling loop guard as a default on all ports 2-428

enabling PortFast by default on all access ports 2-445

enabling PortFast mode 2-440

enabling protocol tunneling for 2-157

enabling root guard 2-426

enabling spanning tree BackboneFast 2-419

enabling spanning tree on a per VLAN basis 2-449

enabling spanning tree UplinkFast 2-447

setting an interface priority 2-446

setting drop threshold for 2-159

setting pathcost 2-423

setting the default pathcost calculation method 2-439

subinterface configuration mode, summary 1-6


creating a Layer 3 interface on a VLAN 2-110

switchport 2-476

switchport interfaces

displaying status of Layer 3 port 2-287

displaying status of native VLAN tagging 2-287

switch shim

debugging 2-69

disabling debugging 2-69

switch to router connection

enabling Cisco-recommended features 2-176

switch to switch connection

enabling Cisco-recommended features 2-178

switch virtual interface


sw-vlan 2-72

system prompts 1-5


Tab key

command completion 1-1


characters with special meaning 1-7

mac access-list extended subcommands 2-163

match syntax description 2-20

multipliers 1-9

relationship between duplex and speed commands 2-452

show vlan command output fields 2-407

show vtp command output fields 2-411

special characters 1-9

special characters used for anchoring 1-10

speed command options 2-451


displaying information useful to TAC 2-395


debugging spanning tree activities 2-67

temperature readings

displaying information 2-259

timer information 2-263

traffic shaping

enable on an interface 2-236

traps, enabling 2-415

trunk encapsulation

setting format 2-476

trunk interfaces

displaying trunk interfaces information 2-294

trust state

setting 2-117

tunnel ports

displaying information about Layer 2 protocol 2-330

TX queues

allocating bandwidth 2-486

returning to default values 2-486

setting priority to high 2-486

specifying burst size 2-486

specifying traffic rate 2-486



enabling by default on all fiber interfaces 2-488

enabling on an individual interface 2-490

preventing a fiber interface from being enabled 2-490

resetting all shutdown ports 2-492

setting the message timer 2-488

Unidirectional Link Detection


unknown multicast traffic, preventing 2-461

unknown unicast traffic, preventing 2-461

user EXEC mode, summary 1-5


setting password and privilege level 2-494



access-group mode 2-5

applying VLAN access maps 2-504

displaying VLAN access map information 2-401

specifying an action in a VLAN access map 2-8

specifying the match clause for a VLAN access-map sequence 2-181

using a VLAN filter 2-504


applying an ARP ACL 2-111

configuring 2-497

converting to RSPAN VLAN 2-230

displaying CEF information 2-300

displaying CEF next-hop information 2-300

displaying information on switch interfaces 2-309

displaying information on VLAN switch interfaces 2-316

displaying information sorted by group IP address 2-309

displaying IP address and version information 2-309

displaying Layer 2 VLAN information 2-398

displaying statistical information 2-353

displaying VLAN information 2-400

enabling dynamic ARP inspection 2-120

enabling Explicit Host Tracking 2-142

enabling guest per-port 2-82

entering VLAN configuration mode 2-501

native frames

enabling tagging on all 802.1Q trunk ports 2-503

pruning the list for VTP 2-476

setting the list of allowed 2-476

VLAN Access Control Lists


VLAN access map


VLAN database

resetting 2-232

VLAN debugging

limiting output 2-48

VLAN manager

debugging 2-72

disabling debugging 2-72

IOS file system error tests

debugging 2-73

disabling debugging 2-73

VLAN Query Protocol


VLAN query protocol (VQPC)

debugging 2-77



counters 2-41

clearing hardware logic 2-25


internal allocation scheme 2-505


internal VLAN allocation information 2-404


entering VLAN configuration mode 2-501


configuring servers 2-509

reconfirming dynamic VLAN assignments 2-507

voice VLANs

enabling 2-457


configuring auto-QoS 2-12


per-server retry count 2-508

reconfirming dynamic VLAN assignments 2-507


configuring the administrative domain name 2-513

configuring the device in VTP client mode 2-512

configuring the device in VTP server mode 2-516

configuring the device in VTP transparent mode 2-517

configuring tunnel encapsulation rate 2-160

creating a VTP domain password 2-514

displaying domain information 2-410

displaying statistics information 2-410

enabling protocol tunneling for 2-157

enabling pruning in the VLAN database 2-515

enabling VTP version 2 mode 2-518

modifying the VTP configuration storage file name 2-511

set drop threshold for 2-159

VTP protocol code

activating debug messages 2-75

deactivating debug messages 2-75