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T2500G-10MPS(config)# ip dhcp relay vlan 1 helper-address 192.168.2.1 37.9 show ip dhcp relay Description The show ip dhcp relay command is used to display the global status and Option 82 configuration of DHCP Relay. Syntax show ip dhcp relay Command Mode Privileged EXEC Mode and Any Configuration Mode Privilege Requirement None. Example Display the configuration of DHCP Relay: T2500G-10MPS(config)# show ip dhcp relay 380

Section	Page
Preface	19
Chapter 1 Using the CLI	22
1.1 Accessing the CLI	22
1.1.1 Logon by a console port	22
1.1.2 Logon by Telnet	24
1.1.3 Logon by SSH	28
1.2 CLI Command Modes	33
1.3 Privilege Restrictions	36
1.4 Conventions	36
1.4.1 Format Conventions	36
1.4.2 Special Characters	37
1.4.3 Parameter Format	37
Chapter 2 User Interface	38
2.1 enable	38
2.2 service password-encryption	38
2.3 enable password	39
2.4 enable secret	40
2.5 configure	41
2.6 exit	42
2.7 end	42
2.8 history	43
2.9 history clear	43
Chapter 3 IEEE 802.1Q VLAN Commands	45
3.1 vlan	45
3.2 interface vlan	46
3.3 name	46
3.4 switchport mode	47
3.5 switchport access vlan	48
3.6 switchport trunk allowed vlan	48
3.7 switchport general allowed vlan	49
3.8 switchport pvid	50
3.9 show vlan summary	51
3.10 show vlan brief	51
3.11 show vlan	52
3.12 show interface switchport	52
Chapter 4 MAC-based VLAN Commands	54
4.1 mac-vlan mac-address	54
4.2 mac-vlan	55
4.3 show mac-vlan	55
4.4 show mac-vlan interface	56
Chapter 5 Protocol-based VLAN Commands	57
5.1 protocol-vlan template	57
5.2 protocol-vlan vlan	58
5.3 protocol-vlan group	58
5.4 show protocol-vlan template	59
5.5 show protocol-vlan vlan	60
Chapter 6 VLAN-VPN Commands	61
6.1 dot1q-tunnel	61
6.2 dot1q-tunnel tpid	61
6.3 switchport dot1q-tunnel mapping	62
6.4 switchport dot1q-tunnel mode nni	63
6.5 show dot1q-tunnel	64
6.6 show dot1q-tunnel mapping	64
6.7 show dot1q-tunnel interface	65
Chapter 7 L2PT Commands	66
7.1 l2protocol-tunnel	66
7.2 l2protocol-tunnel type	66
7.3 show l2protocol-tunnel global	68
7.4 show l2protocol-tunnel interface	68
Chapter 8 GVRP Commands	70
8.1 gvrp	70
8.2 gvrp (interface)	70
8.3 gvrp registration	71
8.4 gvrp timer	72
8.5 show gvrp interface	73
8.6 show gvrp global	74
Chapter 9 Voice VLAN Commands	75
9.1 voice vlan	75
9.2 voice vlan aging	75
9.3 voice vlan priority	76
9.4 voice vlan mac-address	77
9.5 switchport voice vlan mode	78
9.6 switchport voice vlan security	78
9.7 show voice vlan	79
9.8 show voice vlan oui	79
9.9 show voice vlan switchport	80
Chapter 10 Etherchannel Commands	81
10.1 channel-group	81
10.2 port-channel load-balance	82
10.3 lacp system-priority	83
10.4 lacp port-priority	84
10.5 show etherchannel	84
10.6 show etherchannel load-balance	85
10.7 show lacp	86
10.8 show lacp sys-id	86
Chapter 11 User Management Commands	88
11.1 user name (password)	88
11.2 user name (secret)	89
11.3 service password-recovery	90
11.4 user access-control ip-based	91
11.5 user access-control mac-based	92
11.6 user access-control port-based	93
11.7 line	94
11.8 password	95
11.9 login	96
11.10 login local	96
11.11 media-type rj45	97
11.12 telnet	98
11.13 serial_port baud-rate	98
11.14 show password-recovery	99
11.15 show user account-list	100
11.16 show user configuration	100
11.17 show telnet-status	101
Chapter 12 HTTP and HTTPS Commands	102
12.1 ip http server	102
12.2 ip http max-users	103
12.3 ip http session timeout	104
12.4 ip http secure-server	104
12.5 ip http secure-protocol	105
12.6 ip http secure-ciphersuite	106
12.7 ip http secure-max-users	106
12.8 ip http secure-session timeout	107
12.9 ip http secure-server download certificate	108
12.10 ip http secure-server download key	109
12.11 show ip http configuration	110
12.12 show ip http secure-server	110
Chapter 13 Binding Table Commands	111
13.1 ip source binding	111
13.2 ip dhcp snooping	112
13.3 ip dhcp snooping vlan	113
13.4 ip dhcp snooping information option	114
13.5 ip dhcp snooping information strategy	114
13.6 ip dhcp snooping information remote-id	115
13.7 ip dhcp snooping information circuit-id	116
13.8 ip dhcp snooping trust	117
13.9 ip dhcp snooping mac-verify	117
13.10 ip dhcp snooping limit rate	118
13.11 ip dhcp snooping decline rate	119
13.12 show ip source binding	120
13.13 show ip dhcp snooping	120
13.14 show ip dhcp snooping interface	121
13.15 show ip dhcp snooping information interface	121
Chapter 14 ARP Inspection Commands	123
14.1 ip arp inspection(global)	123
14.2 ip arp inspection trust	123
14.3 ip arp inspection(interface)	124
14.4 ip arp inspection limit-rate	125
14.5 ip arp inspection recover	126
14.6 show ip arp inspection	126
14.7 show ip arp inspection interface	127
14.8 show ip arp inspection statistics	127
14.9 clear ip arp inspection statistics	128
Chapter 15 DoS Defend Commands	129
15.1 ip dos-prevent	129
15.2 ip dos-prevent type	129
15.3 show ip dos-prevent	131
Chapter 16 IEEE 802.1X Commands	133
16.1 dot1x system-auth-control	133
16.2 dot1x handshake	134
16.3 dot1x auth-method	134
16.4 dot1x accounting	135
16.5 dot1x guest-vlan(global)	136
16.6 dot1x quiet-period	136
16.7 dot1x timeout supplicant-timeout	137
16.8 dot1x max-reauth-req	138
16.9 dot1x	139
16.10 dot1x guest-vlan(interface)	139
16.11 dot1x port-control	140
16.12 dot1x port-method	141
16.13 show dot1x global	142
16.14 show dot1x interface	142
Chapter 17 PPPoE ID-Insertion Commands	144
17.1 pppoe id-insertion(global)	144
17.2 pppoe circuit-id(interface)	145
17.3 pppoe circuit-id type	145
17.4 pppoe remote-id	146
17.5 show pppoe id-insertion global	147
17.6 show pppoe id-insertion interface	147
Chapter 18 System Log Commands	149
18.1 logging buffer	149
18.2 logging buffer level	149
18.3 logging file flash	150
18.4 logging file flash frequency	151
18.5 logging file flash level	152
18.6 logging host index	152
18.7 logging console	153
18.8 logging console level	154
18.9 logging monitor	155
18.10 logging monitor level	155
18.11 clear logging	156
18.12 show logging local-config	157
18.13 show logging loghost	157
18.14 show logging buffer	158
18.15 show logging flash	158
Chapter 19 SSH Commands	160
19.1 ip ssh server	160
19.2 ip ssh version	160
19.3 ip ssh algorithm	161
19.4 ip ssh timeout	162
19.5 ip ssh max-client	162
19.6 ip ssh download	163
19.7 remove public-key	164
19.8 show ip ssh	164
Chapter 20 MAC Address Commands	166
20.1 mac address-table static	166
20.2 mac address-table aging-time	167
20.3 mac address-table filtering	167
20.4 mac address-table notification	168
20.5 mac address-table max-mac-count	169
20.6 mac address-table notification (interface)	170
20.7 mac address-table security	171
20.8 show mac address-table	172
20.9 clear mac address-table	173
20.10 show mac address-table aging-time	173
20.11 show mac address-table max-mac-count	174
20.12 show mac address-table interface	174
20.13 show mac address-table count	175
20.14 show mac address-table address	176
20.15 show mac address-table vlan	176
20.16 show mac address-table notification	177
20.17 show mac address-table security	177
Chapter 21 System Configuration Commands	179
21.1 system-time manual	179
21.2 system-time ntp	179
21.3 system-time dst predefined	181
21.4 system-time dst date	182
21.5 system-time dst recurring	183
21.6 hostname	184
21.7 location	185
21.8 contact-info	185
21.9 ip address	186
21.10 ip address-alloc	187
21.11 reset	188
21.12 reboot	188
21.13 reboot-schedule	189
21.14 copy running-config startup-config	190
21.15 copy startup-config tftp	190
21.16 copy tftp startup-config	191
21.17 boot application	192
21.18 remove backup-image	192
21.19 firmware upgrade	193
21.20 boot autoinstall start	194
21.21 boot autoinstall persistent-mode	194
21.22 boot autoinstall auto-save	195
21.23 boot autoinstall auto-reboot	195
21.24 boot autoinstall retry-count	196
21.25 show boot autoinstall	196
21.26 show boot autoinstall downloaded-config	197
21.27 ping	197
21.28 tracert	198
21.29 show system-info	199
21.30 show system-info interface	200
21.31 show image-info	200
21.32 show boot	201
21.33 show running-config	201
21.34 show startup-config	202
21.35 show system-time	202
21.36 show system-time dst	203
21.37 show system-time ntp	203
21.38 show cable-diagnostics interface gigabitEthernet	204
21.39 show cable-diagnostics careful interface	204
21.40 show cpu-utilization	205
21.41 show memory-utilization	205
Chapter 22 IPv6 Address Configuration Commands	207
22.1 ipv6 enable	207
22.2 ipv6 address autoconfig	207
22.3 ipv6 address link-local	208
22.4 ipv6 address dhcp	209
22.5 ipv6 address ra	209
22.6 ipv6 address eui-64	210
22.7 ipv6 address	211
22.8 show ipv6 interface	212
Chapter 23 Ethernet Configuration Commands	213
23.1 interface gigabitEthernet	213
23.2 interface range gigabitEthernet	213
23.3 description	214
23.4 shutdown	215
23.5 flow-control	216
23.6 duplex	216
23.7 jumbo	217
23.8 jumbo-size	217
23.9 speed	218
23.10 storm-control	219
23.11 bandwidth	220
23.12 clear counters	220
23.13 show interface status	221
23.14 show interface counters	222
23.15 show interface configuration	222
23.16 show storm-control	223
23.17 show bandwidth	223
Chapter 24 QoS Commands	225
24.1 qos	225
24.2 qos cos	226
24.3 qos dscp	226
24.4 qos queue cos-map	227
24.5 qos queue dscp-map	228
24.6 qos queue mode	229
24.7 qos queue weight	230
24.8 show qos interface	231
24.9 show qos cos-map	232
24.10 show qos dscp-map	232
24.11 show qos queue mode	233
24.12 show qos status	233
Chapter 25 Port Mirror Commands	235
25.1 monitor session destination interface	235
25.2 monitor session source interface	236
25.3 show monitor session	237
Chapter 26 Port Isolation Commands	238
26.1 port isolation	238
26.2 show port isolation interface	239
Chapter 27 Loopback Detection Commands	240
27.1 loopback-detection(global)	240
27.2 loopback-detection interval	240
27.3 loopback-detection recovery-time	241
27.4 loopback-detection(interface)	242
27.5 loopback-detection config	242
27.6 loopback-detection recover	243
27.7 show loopback-detection global	244
27.8 show loopback-detection interface	244
Chapter 28 DDM Commands	246
28.1 ddm state enable	246
28.2 ddm shutdown	246
28.3 ddm temperature_threshold	247
28.4 ddm voltage_threshold	248
28.5 ddm bias_current_threshold	249
28.6 ddm tx_power_threshold	250
28.7 ddm rx_power_threshold	251
28.8 show ddm configuration	252
28.9 show ddm status	253
Chapter 29 ACL Commands	254
29.1 time-range	254
29.2 absolute	254
29.3 periodic	255
29.4 holiday	256
29.5 holiday(global)	257
29.6 access-list create	257
29.7 mac access-list	258
29.8 access-list standard	259
29.9 access-list extended	260
29.10 rule	261
29.11 access-list policy name	262
29.12 access-list policy action	263
29.13 redirect interface	264
29.14 s-condition	264
29.15 s-mirror	265
29.16 qos-remark	266
29.17 access-list bind acl(interface)	267
29.18 access-list bind acl(vlan)	267
29.19 access-list bind(interface)	268
29.20 access-list bind(vlan)	269
29.21 show access-list	269
29.22 show access-list policy	270
29.23 show access-list bind	270
Chapter 30 MSTP Commands	271
30.1 debug spanning-tree	271
30.2 spanning-tree(global)	272
30.3 spanning-tree(interface)	272
30.4 spanning-tree common-config	273
30.5 spanning-tree mode	274
30.6 spanning-tree mst configuration	275
30.7 instance	275
30.8 name	276
30.9 revision	277
30.10 spanning-tree mst instance	278
30.11 spanning-tree mst	278
30.12 spanning-tree priority	279
30.13 spanning-tree timer	280
30.14 spanning-tree hold-count	281
30.15 spanning-tree max-hops	281
30.16 spanning-tree bpdufilter	282
30.17 spanning-tree bpduguard	283
30.18 spanning-tree guard loop	283
30.19 spanning-tree guard root	284
30.20 spanning-tree guard tc	285
30.21 spanning-tree mcheck	285
30.22 show spanning-tree active	286
30.23 show spanning-tree bridge	286
30.24 show spanning-tree interface	287
30.25 show spanning-tree interface-security	288
30.26 show spanning-tree mst	288
Chapter 31 DLDP Commands	290
31.1 dldp(global)	290
31.2 dldp interval	290
31.3 dldp shut-mode	291
31.4 dldp reset(global)	292
31.5 dldp(interface)	292
31.6 dldp reset(interface)	293
31.7 show dldp	293
31.8 show dldp interface	294
Chapter 32 IGMP Snooping Commands	295
32.1 ip igmp snooping(global)	295
32.2 ip igmp snooping(interface)	295
32.3 ip igmp snooping rtime	296
32.4 ip igmp snooping mtime	297
32.5 ip igmp snooping report-suppression	297
32.6 ip igmp snooping immediate-leave	298
32.7 ip igmp snooping drop-unknown	298
32.8 ip igmp snooping last-listener query-inteval	299
32.9 ip igmp snooping last-listener query-count	300
32.10 ip igmp snooping vlan-config	300
32.11 ip igmp snooping vlan-config (router-port-forbidden)	302
32.12 ip igmp snooping multi-vlan-config	303
32.13 ip igmp snooping multi-vlan-config (router-port-forbidden)	304
32.14 ip igmp snooping multi-vlan-config (source-ip-replace)	305
32.15 ip igmp snooping querier vlan	305
32.16 ip igmp snooping querier vlan (general query)	306
32.17 ip igmp snooping max-groups	307
32.18 ip igmp snooping authentication	308
32.19 ip igmp snooping accounting	309
32.20 ip igmp profile	309
32.21 deny	310
32.22 permit	311
32.23 range	311
32.24 ip igmp filter	312
32.25 clear ip igmp snooping statistics	312
32.26 show ip igmp snooping	313
32.27 show ip igmp snooping interface	313
32.28 show ip igmp snooping vlan	314
32.29 show ip igmp snooping multi-vlan	315
32.30 show ip igmp snooping groups	315
32.31 show ip igmp snooping querier	316
32.32 show ip igmp profile	317
Chapter 33 MLD Snooping Commands	318
33.1 ipv6 mld snooping(global)	318
33.2 ipv6 mld snooping(interface)	318
33.3 ipv6 mld snooping rtime	319
33.4 ipv6 mld snooping mtime	319
33.5 ipv6 mld snooping report-suppression	320
33.6 ipv6 mld snooping immediate-leave	321
33.7 ipv6 mld snooping drop-unknown	321
33.8 ipv6 mld snooping last-listener query-inteval	322
33.9 ipv6 mld snooping last-listener query-count	322
33.10 ipv6 mld snooping vlan-config	323
33.11 ip mld snooping vlan-config (router-port-forbidden)	324
33.12 ipv6 mld snooping multi-vlan-config	325
33.13 ipv6 mld snooping multi-vlan-config (router-port-forbidden)	326
33.14 ipv6 mld snooping multi-vlan-config (source-ip-replace)	327
33.15 ipv6 mld snooping querier vlan	328
33.16 ipv6 mld snooping querier vlan (general query)	328
33.17 ipv6 mld snooping max-groups	329
33.18 ipv6 mld profile	331
33.19 deny	331
33.20 permit	332
33.21 range	332
33.22 ipv6 mld filter	333
33.23 clear ipv6 mld snooping statistics	333
33.24 show ipv6 mld snooping	334
33.25 show ipv6 mld snooping interface	334
33.26 show ipv6 mld snooping vlan	335
33.27 show ipv6 mld snooping multi-vlan	336
33.28 show ipv6 mld snooping groups	336
33.29 show ipv6 mld snooping querier	337
33.30 show ipv6 mld profile	337
Chapter 34 SNMP Commands	339
34.1 snmp-server	339
34.2 snmp-server view	339
34.3 snmp-server group	340
34.4 snmp-server user	342
34.5 snmp-server community	343
34.6 snmp-server host	344
34.7 snmp-server engineID	346
34.8 snmp-server traps snmp	346
34.9 snmp-server traps link-status	347
34.10 snmp-server traps	348
34.11 snmp-server traps power	349
34.12 snmp-server traps ddm	350
34.13 snmp-server traps vlan	352
34.14 rmon history	352
34.15 rmon event	353
34.16 rmon alarm	354
34.17 rmon statistics	356
34.18 show snmp-server	357
34.19 show snmp-server view	357
34.20 show snmp-server group	358
34.21 show snmp-server user	358
34.22 show snmp-server community	359
34.23 show snmp-server host	359
34.24 show snmp-server engineID	359
34.25 show rmon history	360
34.26 show rmon event	361
34.27 show rmon alarm	361
34.28 show rmon statistics	362
Chapter 35 LLDP Commands	363
35.1 lldp	363
35.2 lldp hold-multiplier	363
35.3 lldp timer	364
35.4 lldp receive	365
35.5 lldp transmit	366
35.6 lldp snmp-trap	366
35.7 lldp tlv-select	367
35.8 lldp med-fast-count	368
35.9 lldp med-status	368
35.10 lldp med-tlv-select	369
35.11 lldp med-location	370
35.12 show lldp	371
35.13 show lldp interface	371
35.14 show lldp local-information interface	372
35.15 show lldp neighbor-information interface	372
35.16 show lldp traffic interface	373
Chapter 36 AAA Commands	374
36.1 aaa enable	374
36.2 tacacas-server host	375
36.3 show tacacs-server	376
36.4 radius-server host	376
36.5 show radius-server	378
36.6 aaa group	378
36.7 server	379
36.8 show aaa group	380
36.9 aaa authentication login	380
36.10 aaa authentication enable	381