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Loopback Detection Commands, loopback-detection (global)

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Chapter 16 Loopback Detection Commands With loopback detection feature enabled, the switch can detect loops using loopback detection packets. When a loop is detected, the switch will display an alert or further block the corresponding port according to the configuration. loopback-detection (global) Description The loopback-detection command is used to enable the loopback detection function globally. To disable it, please use no loopback detection command. Syntax loopback-detection no loopback-detection Command Mode Global Configuration Mode Example Enable the loopback detection function globally: TL-SG2424P(config)# loopback-detection loopback-detection interval Description The loopback-detection interval command is used to define the interval of sending loopback detection packets from switch ports to network, aiming at detecting network loops periodically. Syntax loopback-detection interval interval-time Parameter interval-time ii The interval of sending loopback detection packets. It ranges from 1 to 1000 seconds. By default, this value is 30. Command Mode Global Configuration Mode 89

Section	Page
Preface	11
Chapter 1 Using the CLI	13
1.1 Accessing the CLI	13
1.2 CLI Command Modes	14
1.3 Security Levels	16
1.4 Conventions	16
1.4.1 Format Conventions	16
1.4.2 Special Characters	17
1.4.3 Parameter Format	17
Chapter 2 User Interface	18
enable	18
enable password	18
disable	19
configure	19
exit	20
end	20
Chapter 3 IEEE 802.1Q VLAN Commands	21
vlan	21
interface vlan	21
name	22
switchport mode	22
switchport access vlan	23
switchport trunk allowed vlan	24
switchport general allowed vlan	24
switchport pvid	25
show vlan summary	25
show vlan brief	26
show vlan	26
Chapter 4 Voice VLAN Commands	28
voice vlan	28
voice vlan aging time	28
voice vlan priority	29
voice vlan mac-address	29
switchport voice vlan mode	30
switchport voice vlan security	31
show voice vlan	31
show voice vlan oui	32
show voice vlan switchport	32
Chapter 5 Etherchannel Commands	33
channel-group	33
port-channel load-balance	34
lacp system-priority	34
lacp port-priority	35
show etherchannel	35
show etherchannel load-balance	36
show lacp	36
show lacp sys-id	37
Chapter 6 User Manage Commands	38
user	38
user access-control ip-based	39
user access-control mac-based	39
user access-control port-based	40
user max-number	41
user idle-timeout	41
show user account-list	42
show user configuration	42
Chapter 7 System Log Commands	44
logging buffer	44
logging file flash	45
clear logging	45
logging host index	46
show logging local-config	47
show logging loghost	47
show logging buffer	47
show logging flash	48
Chapter 8 SSH Commands	49
ip ssh server	49
ip ssh version	49
ip ssh timeout	50
ip ssh max-client	50
ip ssh download	51
show ip ssh	51
Chapter 9 SSL Commands	53
ip http secure-server	53
ip http secure-server download certificate	53
ip http secure-server download key	54
show ip http secure-server	55
Chapter 10 MAC Address Commands	56
mac address-table static	56
mac address-table aging-time	56
mac address-table filtering	57
mac address-table max-mac-count	58
show mac address-table address	59
show mac address-table aging-time	59
show mac address-table max-mac-count interface gigabitEthernet	60
show mac address-table interface gigabitEthernet	60
show mac address-table mac-num	61
show mac address-table mac	61
show mac address-table vlan	62
Chapter 11 System Configuration Commands	63
system-time manual	63
system-time ntp	63
system-time dst predefined	65
system-time dst date	65
system-time dst recurring	66
hostname	67
location	68
contact-info	68
reset	69
reboot	69
copy running-config startup-config	69
copy startup-config tftp	70
copy tftp startup-config	70
firmware upgrade	71
ping	71
tracert	72
loopback interface	73
show system-time	73
show system-time dst	74
show system-time ntp	74
show system-info	75
show cable-diagnostics interface	75
Chapter 12 Ethernet Configuration Commands	76
interface gigabitEthernet	76
interface range gigabitEthernet	76
description	77
shutdown	77
flow-control	78
duplex	78
speed	79
storm-control broadcast	80
storm-control multicast	80
storm-control unicast	81
bandwidth	82
clear counters	82
show interface status	83
show interface counters	83
show interface description	84
show interface flowcontrol	84
show interface configuration	85
show storm-control	85
show bandwidth	86
Chapter 13 QoS Commands	87
qos	87
qos dscp	87
qos queue cos-map	88
qos queue dscp-map	89
qos queue mode	90
show qos interface	91
show qos cos-map	91
show qos dscp-map	92
show qos queue mode	92
show qos status	93
Chapter 14 Port Mirror Commands	94
monitor session destination interface	94
monitor session source interface	95
show monitor session	96
Chapter 15 Port Isolation Commands	97
port isolation	97
show port isolation interface	97
Chapter 16 Loopback Detection Commands	99
loopback-detection (global)	99
loopback-detection interval	99
loopback-detection recovery-time	100
loopback-detection (interface)	100
loopback-detection config	101
loopback-detection recover	101
show loopback-detection global	102
show loopback-detection interface	102
Chapter 17 DHCP Filtering Commands	104
ip dhcp filtering	104
ip dhcp filtering trust	104
show ip dhcp filtering	105
show ip dhcp filtering interface	105
Chapter 18 PoE Commands	106
power inline consumption (global)	106
power profile	106
power time-range	107
power holiday	108
absolute	109
periodic	109
holiday	110
power inline consumption (interface)	111
power inline priority	111
power inline supply	112
power inline profile	112
power inline time-range	113
show power inline	113
show power inline configuration interface	114
show power inline information interface	114
show power profile	115
show power holiday	115
show power time-range	115
Chapter 19 MSTP Commands	117
spanning-tree (global)	117
spanning-tree (interface)	117
spanning-tree common-config	118
spanning-tree mode	119
spanning-tree mst configuration	119
instantce	120
name	121
revision	121
spanning-tree mst instance	122
spanning-tree mst	122
spanning-tree priority	123
spanning-tree tc-defend	124
spanning-tree timer	124
spanning-tree hold-count	125
spanning-tree max-hops	126
spanning-tree bpdufilter	126
spanning-tree bpduguard	127
spanning-tree guard loop	127
spanning-tree guard root	128
spanning-tree guard tc	128
spanning-tree mcheck	129
show spanning-tree active	129
show spanning-tree bridge	130
show spanning-tree interface	130
show spanning-tree interface-security	131
show spanning-tree mst	132
Chapter 20 IGMP Commands	133
ip igmp snooping (global)	133
ip igmp snooping (interface)	133
ip igmp snooping immediate-leave	134
ip igmp snooping drop-unknown	134
ip igmp snooping vlan-config	135
ip igmp snooping multi-vlan-config	136
ip igmp snooping filter add-id	137
ip igmp snooping filter (global)	138
ip igmp snooping filter (interface)	138
ip igmp snooping filter maxgroup	139
ip igmp snooping filter mode	139
show ip igmp snooping	140
show ip igmp snooping interface	140
show ip igmp snooping vlan	141
show ip igmp snooping multi-vlan	142
show ip igmp snooping groups	142
show ip igmp snooping filter	143
Chapter 21 SNMP Commands	144
snmp-server	144
snmp-server view	144
snmp-server group	145
snmp-server user	146
snmp-server community	148
snmp-server host	148
snmp-server engineID	150
rmon history	150
rmon event	151
rmon alarm	152
show snmp-server	154
show snmp-server view	154
show snmp-server group	154
show snmp-server user	155
show snmp-server community	155
show snmp-server host	156
show snmp-server engineID	156
show rmon history	156
show rmon event	157
show rmon alarm	157
Chapter 22 LLDP Commands	159
lldp	159
lldp hold-multiplier	159
lldp timer	160
lldp med-fast-count	161
lldp receive	161
lldp transmit	162
lldp snmp-trap	162
lldp tlv-select	163
lldp med-location	164
lldp med-status	164
lldp med-tlv-select	165
show lldp	166
show lldp interface	166
show lldp local-information interface	167
show lldp neighbor-information interface	167