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Ethernet Switch CLI Reference Guide
137
CHAPTER 33
Loopguard Commands
Use these commands to configure the Switch to guard against loops on the edge of your
network. The Switch shuts down a port if the Switch detects that packets sent out on the port
loop back to the Switch.
33.1 Command Summary
The following section lists the commands for this feature.
Table 79 loopguard Command Summary
COMMAND DESCRIPTION M P
show loopguard Displays which ports have loopguard enabled as well as their
status.
E3
loopguard Enables loopguard on the Switch. C 13
no loopguard Disables loopguard on the Switch. C 13
interface port-channel <port-
list>
Enters config-interface mode for the specified port(s). C 13
loopguard Enables the loopguard feature on the port(s). You have to
enable loopguard on the Switch as well. The Switch shuts
down a port if the Switch detects that packets sent out on the
port loop back to the Switch.
C13
no loopguard Disables the loopguard feature on the port(s). C 13
clear loopguard Clears loopguard counters. E 13
- Ethernet Switch 1
- Document Conventions 5
- Icons Used in Figures 7
- Contents Overview 11
- Contents Overview 12
- Introduction 13
- CHAPTER 1 15
- 1.2 Logging in 16
- 1.5 Logging Out 17
- CHAPTER 2 19
- 2.2 Command Modes 21
- CHAPTER 3 25
- Chapter 3 Initial Setup 26
- Chapter 3 Initial Setup 27
- Reference A-G 29
- CHAPTER 4 31
- Chapter 4 AAA Commands 32
- CHAPTER 5 33
- Chapter 5 ARP Commands 34
- CHAPTER 6 35
- 6.2 Command Examples 37
- CHAPTER 7 41
- Chapter 7 Bandwidth Commands 42
- Chapter 7 Bandwidth Commands 43
- CHAPTER 8 45
- • 64 DLF packets per second 47
- CHAPTER 9 49
- 9.2 CFM Term Definition 50
- 9.3 User Input Values 51
- 9.4 Command Summary 52
- Chapter 9 CFM Commands 53
- Chapter 9 CFM Commands 54
- 9.5 Command Examples 55
- CHAPTER 10 59
- 10.2 Command Examples 60
- CHAPTER 11 63
- 11.2 Command Examples 64
- Chapter 11 Cluster Commands 65
- Table 35 show cluster 65
- Chapter 11 Cluster Commands 66
- CHAPTER 12 67
- 12.2 Command Examples 68
- Table 39 show timesync 69
- CHAPTER 13 71
- Chapter 13 DHCP Commands 72
- 13.2 Command Examples 73
- CHAPTER 14 75
- 14.2 Command Examples 76
- CHAPTER 15 79
- Chapter 15 DiffServ Commands 80
- CHAPTER 16 81
- 16.3 Command Examples 82
- CHAPTER 17 83
- 17.3 Command Examples 84
- CHAPTER 18 89
- 18.3 Command Examples 90
- CHAPTER 19 91
- Chapter 19 GVRP Commands 92
- PART III 93
- CHAPTER 20 95
- 20.2 Command Examples 96
- Table 56 show https session 97
- CHAPTER 21 99
- CHAPTER 22 101
- 22.3 Command Examples 102
- CHAPTER 23 105
- 23.2 Command Examples 109
- 225.255.255.255 110
- CHAPTER 24 111
- 24.2 Command Examples 112
- CHAPTER 25 113
- 25.2 Command Examples 114
- Chapter 25 Interface Commands 116
- CHAPTER 26 117
- CHAPTER 27 119
- 27.2 Command Examples 120
- Chapter 27 IP Commands 121
- Chapter 27 IP Commands 122
- Table 72 show ip udp 122
- CHAPTER 28 123
- CHAPTER 29 125
- 29.2 Command Examples 127
- CHAPTER 30 129
- 30.2 Command Summary 130
- 30.3 Command Examples 132
- CHAPTER 31 133
- Chapter 31 Logging Commands 134
- CHAPTER 32 135
- CHAPTER 33 137
- 33.2 Command Examples 138
- CHAPTER 34 139
- 34.2 Command Examples 140
- CHAPTER 35 141
- 35.3 Command Examples 142
- CHAPTER 36 143
- 36.2 Command Example 144
- CHAPTER 37 145
- CHAPTER 38 147
- 38.2 Command Examples 148
- Chapter 38 Mirror Commands 149
- Chapter 38 Mirror Commands 150
- CHAPTER 39 151
- 39.3 Command Examples 152
- CHAPTER 40 153
- 40.2 Command Examples 154
- Chapter 40 MSTP Commands 155
- Table 93 show mstp instance 155
- MST instance 2 156
- CHAPTER 41 157
- CHAPTER 42 159
- 42.2 Command Examples 160
- Reference N-S 161
- CHAPTER 43 163
- Chapter 43 OSPF Commands 164
- Chapter 43 OSPF Commands 165
- 43.3 Command Examples 166
- Switch is also set to 1, as 167
- CHAPTER 44 169
- Chapter 44 Password Commands 170
- CHAPTER 45 171
- 45.2 Command Examples 172
- Chapter 45 PoE Commands 173
- Chapter 45 PoE Commands 174
- CHAPTER 46 175
- Chapter 46 Policy Commands 176
- 46.2 Command Examples 177
- CHAPTER 47 179
- 47.2 Command Examples 180
- CHAPTER 48 181
- CHAPTER 49 183
- 49.3 Command Examples 184
- CHAPTER 50 185
- Chapter 50 Queuing Commands 186
- Chapter 50 Queuing Commands 187
- CHAPTER 51 189
- 51.2 Command Examples 190
- CHAPTER 52 191
- 52.2 Command Examples 192
- CHAPTER 53 193
- Chapter 53 RIP Commands 194
- CHAPTER 54 195
- 54.3 Command Examples 196
- CHAPTER 55 197
- CHAPTER 56 201
- 56.2 Command Examples 202
- CHAPTER 57 205
- Chapter 57 SSH Commands 206
- Table 121 show ssh 206
- CHAPTER 58 207
- 58.2 Command Examples 208
- CHAPTER 59 209
- 59.2 Command Examples 210
- CHAPTER 60 213
- 60.3 Command Examples 214
- CHAPTER 61 215
- Chapter 61 Syslog Commands 216
- Reference T-Z 217
- CHAPTER 62 219
- Chapter 62 TACACS+ Commands 220
- CHAPTER 63 221
- Chapter 63 TFTP Commands 222
- CHAPTER 64 223
- 64.2 Command Examples 224
- Chapter 64 Trunk Commands 225
- Table 136 show lacp 225
- Chapter 64 Trunk Commands 226
- CHAPTER 65 227
- 65.3 Command Examples 228
- CHAPTER 66 229
- 66.3 Command Summary 230
- 66.4 Command Examples 231
- Chapter 66 VLAN Commands 232
- Table 141 show vlan 232
- Chapter 66 VLAN Commands 233
- CHAPTER 67 235
- 67.3 Command Examples 236
- CHAPTER 68 237
- 68.2 Command Examples 238
- CHAPTER 69 239
- CHAPTER 70 241
- 70.2 Command Examples 242
- CHAPTER 71 245
- CHAPTER 72 247
- 72.3 Command Examples 248
- Chapter 72 VRRP Commands 249
- Chapter 72 VRRP Commands 250
- CHAPTER 73 251
- 73.2 Command Examples 253
- Table 152 ping 254
- Table 153 show alarm-status 254
- Switch 257
- 192.168.1.100 259
- Appendices and 261
- Index of Commands 261
- APPENDIX A 263
- Appendix A Default Values 264
- APPENDIX B 265
- ZyXEL Limited Warranty 266
- Appendix B Legal Information 267
- MES-3728 User’s Guide 267
- Appendix B Legal Information 268
- Index of Commands 271
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