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HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 32

loopback-detection control enable

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system-view [Sysname] loopback-detection enable [Sysname] interface gigabitethernet 1/0/1 [Sysname-GigabitEthernet1/0/1] loopback-detection enable [Sysname-GigabitEthernet1/0/1] loopback-detection action shutdown # Configure the trunk port GigabitEthernet 1/0/2 to shut down when a loop is detected. system-view [Sysname] loopback-detection enable [Sysname] interface gigabitethernet 1/0/2 [Sysname-GigabitEthernet1/0/2] port link-type trunk [Sysname-GigabitEthernet1/0/2] loopback-detection enable [Sysname-GigabitEthernet1/0/2] loopback-detection control enable [Sysname-GigabitEthernet1/0/2] loopback-detection action shutdown loopback-detection control enable Syntax loopback-detection control enable View undo loopback-detection control enable Ethernet interface view Default level 2: System level Parameters None Description Use loopback-detection control enable to enable loopback detection control on trunk or hybrid ports. Use undo loopback-detection control enable to restore the default. By default, loopback detection control is disabled on trunk and hybrid ports. When a hybrid or trunk port detects a loop condition, it sends traps, whether loopback detection control is enabled or not. However, only after loopback detection control is enabled will the port perform the protective action configured with the loopback-detection action command. This command is not applicable to access ports. Examples # Enable loopback detection control on the trunk port GigabitEthernet 1/0/1. system-view [Sysname] loopback-detection enable [Sysname] interface gigabitethernet 1/0/1 [Sysname-GigabitEthernet1/0/1] port link-type trunk [Sysname-GigabitEthernet1/0/1] loopback-detection enable [Sysname-GigabitEthernet1/0/1] loopback-detection control enable 24

Section	Page
Title Page	1
Layer 2 - LAN Switching Command Reference	3
Ethernet interface configuration commands	9
broadcast-suppression	9
default	10
description	10
display counters	11
display counters rate	12
display interface	14
display loopback-detection	21
display packet-drop interface	22
display packet-drop summary	23
display storm-constrain	24
duplex	25
flow-control	26
flow-control receive enable	26
flow-interval	27
interface	28
jumboframe enable	28
link-delay	29
link-delay mode up	30
loopback	30
loopback-detection action	31
loopback-detection control enable	32
loopback-detection enable	33
loopback-detection interval-time	34
loopback-detection per-vlan enable	34
mdi	35
multicast-suppression	36
port bridge enable	37
reset counters interface	37
reset packet-drop interface	38
shutdown	38
speed	39
speed auto	40
storm-constrain	41
storm-constrain control	42
storm-constrain enable log	42
storm-constrain enable trap	43
storm-constrain interval	44
unicast-suppression	44
virtual-cable-test	45
Loopback and null interface configuration commands	47
default	47
description	47
display interface loopback	48
display interface null	51
interface loopback	52
interface null	53
reset counters interface loopback	54
reset counters interface null	54
shutdown	55
Bulk interface configuration commands	56
interface range	56
interface range name	56
MAC address table configuration commands	59
display mac-address	59
display mac-address aging-time	60
display mac-address mac-learning	61
display mac-address statistics	62
mac-address (interface view)	63
mac-address (system view)	64
mac-address mac-learning disable	65
mac-address max-mac-count	66
mac-address timer	67
MAC Information configuration commands	68
mac-address information enable (interface view)	68
mac-address information enable (system view)	68
mac-address information interval	69
mac-address information mode	69
mac-address information queue-length	70
Ethernet link aggregation configuration commands	71
default	71
description	71
display interface	72
display lacp system-id	74
display link-aggregation load-sharing mode	75
display link-aggregation member-port	77
display link-aggregation summary	79
display link-aggregation verbose	80
enable snmp trap updown	82
interface bridge-aggregation	83
lacp period short	84
lacp system-priority	84
link-aggregation load-sharing mode	85
link-aggregation load-sharing mode local-first	86
link-aggregation mode	87
link-aggregation port-priority	87
link-aggregation selected-port minimum	88
port link-aggregation group	88
reset counters interface	89
reset lacp statistics	90
shutdown	90
Port isolation configuration commands	92
display port-isolate group	92
port-isolate enable	93
Spanning tree configuration commands	95
active region-configuration	95
check region-configuration	95
display stp	96
display stp abnormal-port	102
display stp bpdu-statistics	103
display stp down-port	105
display stp history	106
display stp region-configuration	108
display stp root	109
display stp tc	110
instance	111
region-name	112
reset stp	112
revision-level	113
stp bpdu-protection	114
stp bridge-diameter	114
stp compliance	115
stp config-digest-snooping	116
stp cost	116
stp edged-port	117
stp enable	118
stp loop-protection	119
stp max-hops	120
stp mcheck	120
stp mode	121
stp no-agreement-check	122
stp pathcost-standard	123
stp point-to-point	123
stp port priority	124
stp port-log	125
stp priority	126
stp region-configuration	127
stp root primary	127
stp root secondary	128
stp root-protection	129
stp tc-protection	129
stp tc-protection threshold	130
stp tc-snooping	130
stp timer forward-delay	131
stp timer hello	132
stp timer max-age	132
stp timer-factor	133
stp transmit-limit	134
vlan-mapping modulo	135
BPDU tunneling configuration commands	136
bpdu-tunnel dot1q	136
bpdu-tunnel tunnel-dmac	137
VLAN configuration commands	138
Basic VLAN configuration commands	138
default	138
description	138
display interface vlan-interface	140
display vlan	142
interface vlan-interface	144
ip address	145
mtu	146
name	146
reset counters interface vlan-interface	147
shutdown	148
vlan	149
Port-based VLAN configuration commands	150
display port	150
port	151
port access vlan	152
port hybrid pvid	152
port hybrid vlan	153
port link-type	155
port trunk permit vlan	156
port trunk pvid	157
MAC-based VLAN configuration commands	158
display mac-vlan	158
display mac-vlan interface	159
mac-vlan enable	160
mac-vlan mac-address	161
mac-vlan trigger enable	161
port pvid disable	162
vlan precedence	163
Protocol-based VLAN configuration commands	164
display protocol-vlan interface	164
display protocol-vlan vlan	165
port hybrid protocol-vlan	166
protocol-vlan	167
IP subnet-based VLAN configuration commands	169
display ip-subnet-vlan interface	169
display ip-subnet-vlan vlan	170
ip-subnet-vlan	171
port hybrid ip-subnet-vlan	172
Isolate-user-VLAN configuration commands	174
display isolate-user-vlan	174
isolate-user-vlan	176
isolate-user-vlan enable	177
port isolate-user-vlan promiscuous	177
port isolate-user-vlan host	179
Voice VLAN configuration commands	182
display voice vlan oui	182
display voice vlan state	183
voice vlan aging	184
voice vlan enable	185
voice vlan mac-address	185
voice vlan mode auto	186
voice vlan qos	187
voice vlan qos trust	188
voice vlan security enable	188
GVRP configuration commands	190
display garp statistics	190
display garp timer	191
display gvrp local-vlan	192
display gvrp state	192
display gvrp statistics	194
display gvrp status	195
display gvrp vlan-operation	196
garp timer hold	196
garp timer join	197
garp timer leave	198
garp timer leaveall	198
gvrp	199
gvrp registration	200
reset garp statistics	200
QinQ configuration commands	202
nest	202
qinq enable	203
qinq ethernet-type customer-tag	203
qinq ethernet-type service-tag	204
qinq transparent-vlan	205
VLAN mapping configuration commands	207
nest	207
remark customer-vlan-id	207
remark service-vlan-id	208
LLDP configuration commands	209
display lldp local-information	209
display lldp neighbor-information	212
display lldp statistics	218
display lldp status	219
display lldp tlv-config	221
lldp admin-status	223
lldp check-change-interval	223
lldp compliance admin-status cdp	224
lldp compliance cdp	225
lldp enable	225
lldp encapsulation snap	226
lldp fast-count	226
lldp hold-multiplier	227
lldp management-address-format string	228
lldp management-address-tlv	228
lldp notification remote-change enable	229
lldp timer notification-interval	229
lldp timer reinit-delay	230
lldp timer tx-delay	230
lldp timer tx-interval	231
lldp tlv-enable	232
lldp voice-vlan	234
Service loopback group configuration commands	235
display service-loopback group	235
port service-loopback group	236
service-loopback group	236
Layer 2 forwarding configuration commands	238
cut-through enable	238
Support and other resources	239
Contacting HP	239
Subscription service	239
Related information	239
Documents	239
Websites	239
Conventions	240
Command conventions	240
GUI conventions	240
Symbols	240
Network topology icons	241
Port numbering in examples	241