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User Manual UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5
A50010-Y3-C150-2-7619 219
8.3.7 Root Guard
The standard STP does not allow the administrator to enforce the position of the root
bridge, as any bridge in the network with lower bridge ID will take the role of the root
bridge. Root guard feature is designed to provide a way to enforce the root bridge place-
ment in the network. Even if the administrator sets the root bridge priority to zero in an ef-
fort to secure the root bridge position, there is still no guarantee against bridge with prior-
ity zero and a lower MAC address.
Switch A Switch B
Root Switch
Root Guard
Configuration
Service provider Customer
Fig. 8.25 Root Guard
Software-based bridge applications launched on PCs or other switches connected by a
customer to a service-provider network can be elected as root switches. If the priority of
bridge B is zero or any value lower than that of the root bridge, device B will be elected as
a root bridge for this VLAN. As a result, network topology could be changed. This may
lead to sub-optimal switching. But, by configuring root guard on switch A, no switches be-
hind the port connecting to switch A can be elected as a root for the service provider’s
switch network. In which case, switch A will block the port connecting switch B.
To configure Root-Guard, use the following command.
Command Mode Description
stp pvst root-guard
VLAN-RANGE PORTS
Configures Root Guard on PVST network.
stp mst root-guard
MSTID-RANGE PORTS
Configures Root Guard on MST network.
no stp pvst root-guard
VLAN-RANGE PORTS
no stp mst root-guard
MSTID-RANGE PORTS
Bridge
Disables Root Guard.
8.3.8 Restarting Protocol Migration
There are two switches which configured as STP and RSTP. Usually, in this case, STP
protocol is used between two switches. But if someone configures the STP switch to
RSTP mode, what happens? Because the RSTP switch already received STP protocol
packet, the two switches still can work with STP mode even though RSTP is enabled at
both. If you enable this command, the switch checks STP protocol packet once again.
- User Manual 1
- Reason for Update 3
- Issue History 3
- Contents 4
- Illustrations 17
- 1 Introduction 20
- 1.3 Document Convention 21
- 1.4 Document Notation 21
- 2 System Overview 23
- 2.1 System Features 24
- 3.1 Command Mode 27
- 3.2 Useful Tips 36
- 3.2.3 Using Abbreviation 38
- 4.1 System Connection 40
- 4.1.6 Telnet Access 47
- 4.1.7 Auto Log-out 48
- 4.1.8 System Rebooting 48
- 4.2 System Authentication 49
- 4.2.1 Authentication Method 50
- 4.2.4 RADIUS Server 51
- 4.2.5 TACACS Server 52
- 4.2.6 Accounting Mode 54
- 4.2.8 Sample Configuration 55
- 4.3 Assigning IP Address 56
- 4.3.1 Enabling Interface 57
- 4.3.2 Disabling Interface 57
- 4.3.7 Displaying Interface 60
- 4.3.8 Sample Configuration 60
- 4.4 SSH (Secure Shell) 61
- 4.4.2 SSH Client 62
- 4.5 802.1x Authentication 64
- 4.5.1 802.1x Authentication 65
- 4.5.1.4 Authentication Port 67
- 4.5.1.5 Force Authorization 67
- 4.5.4 Applying Default Value 70
- 4.5.7 Sample Configuration 71
- 5 Port Configuration 73
- 5.2.2 Auto-negotiation 75
- 5.2.3 Transmit Rate 75
- 5.2.4 Duplex Mode 76
- 5.2.5 Flow Control 76
- 5.2.6 Port Description 77
- 5.2.7 Traffic Statistics 78
- 5.2.7.2 The CPU statistics 79
- 5.3 Port Mirroring 80
- 6 System Environment 83
- 6.1.3 Time Zone 84
- 6.1.4 Network Time Protocol 84
- 6.1.7 Terminal Configuration 86
- 6.1.8 Login Banner 87
- 6.1.9 DNS Server 87
- 6.1.10 Fan Operation 88
- 6.1.12 System Threshold 88
- 6.1.12.2 Port Traffic 89
- 6.1.12.3 Fan Operation 89
- 6.1.13 Enabling FTP Server 90
- 6.2 Configuration Management 91
- 6.2.3 Auto-Saving 92
- 6.3 System Management 94
- Items Description 96
- Source address or interface 96
- Type of service [0]: 96
- 6.3.3 Tracing Packet Route 98
- 6.3.5 MAC Table 99
- 6.3.8 System Information 100
- 6.3.10 CPU packet limit 101
- 6.3.11 Average of CPU Load 101
- 6.3.12 Running Process 101
- 6.3.15 Default OS 102
- 6.3.16 Switch Status 103
- 6.3.17 Tech Support 103
- 7 Network Management 104
- 7.1.3 SNMP Com2sec 106
- 7.1.4 SNMP Group 106
- 7.1.5 SNMP View Record 107
- 7.1.7 SNMP Version 3 User 108
- 7.1.8 SNMP Trap 108
- 7.1.8.1 SNMP Trap Host 109
- 7.1.8.2 SNMP Trap Mode 109
- 7.1.8.3 Enabling SNMP Trap 110
- 7.1.8.4 Disabling SNMP Trap 111
- 7.1.9 SNMP Alarm 112
- 7.1.9.5 ADVA Alarm Severity 115
- 7.1.9.6 ERP Alarm Severity 116
- 7.1.11 Disabling SNMP 118
- 7.2.1 OAM Loopback 119
- 7.2.2 Local OAM Mode 120
- 7.2.3 OAM Unidirection 120
- 7.2.4 Remote OAM 120
- 7.3.1 LLDP Operation 123
- 7.3.2 LLDP Operation Type 123
- 7.3.3 Basic TLV 123
- 7.3.4 LLDP Message 124
- 7.4 Remote Monitoring (RMON) 126
- 7.4.2 RMON Alarm 129
- 7.4.3 RMON Event 132
- 7.4.3.2 Event Description 133
- 7.4.3.4 Event Type 133
- RMON Activates RMON event 134
- running-config rmon 134
- 7.5 Syslog 135
- 7.5.2 Facility Code 137
- 7.5.3 Syslog Bind Address 137
- 7.5.5 Disabling Syslog 138
- 7.6 Rule and QoS 139
- 7.6.2 Rule Configuration 140
- 7.6.2.4 Rule Action 143
- 7.6.2.5 Applying Rule 145
- 7.6.3 QoS 146
- 7.6.3.1 Scheduling Algorithm 147
- 7.6.3.2 Qos Weight 149
- 7.6.4 Admin Access Rule 150
- 7.6.4.1 Rule Creation 151
- 7.6.4.2 Rule Priority 151
- 7.6.4.4 Rule Action 153
- 7.6.4.5 Applying Rule 153
- 7.6.4.7 Displaying Rule 154
- Internet 155
- Needs to prevent sharing 155
- 7.8 Martian Filtering 156
- 7.9 Max Host 156
- 7.9.1 Max New Hosts 157
- 7.10 Port Security 158
- 7.10.2 Port Security Aging 160
- 7.11 MAC Table 161
- 7.12 MAC Filtering 163
- 7.13.1 ARP Table 165
- 7.13.2 ARP Alias 167
- 7.13.3 ARP Inspection 167
- 7.14 ICMP Message Control 169
- Command Mode Description 171
- Type Status 171
- 7.15 IP TCP Flag Control 173
- 7.16 Packet Dump 174
- 7.16.2 Debug Packet Dump 177
- 8 System Main Functions 178
- 8.1.1 Port-Based VLAN 179
- 8.1.1.1 Creating VLAN 180
- 8.1.1.2 Specifying PVID 180
- 8.1.1.4 Deleting VLAN 180
- 8.1.2 Protocol-Based VLAN 181
- 8.1.4 Subnet-based VLAN 182
- 8.1.5 Tagged VLAN 182
- 8.1.6 VLAN Description 183
- 8.1.8 QinQ 184
- 8.1.9 Layer 2 Isolation 186
- 8.1.9.1 Port Isolation 187
- 8.1.9.2 Shared VLAN 187
- 8.1.10 VLAN Translation 189
- 8.1.11 Sample Configuration 189
- Outer Network 192
- Uplink Port 192
- 8.2.1 Port Trunk 193
- 8.2.2.1 Configuring LACP 195
- 8.2.2.2 Packet Route 195
- 8.2.2.8 Priority of Switch 198
- Switch A Switch B 200
- PC-A PC-B 200
- 8.3.1 STP Operation 201
- Listening 204
- Learning 204
- Forwarding 204
- Disabled 204
- Blocking 204
- 8.3.2 RSTP Operation 205
- 8.3.3 MSTP Operation 209
- 8.3.5.2 Root Switch 212
- 8.3.5.3 Path-cost 212
- 8.3.5.4 Port-priority 213
- 8.3.5.5 MST Region 214
- 8.3.5.6 MSTP Protocol 215
- 8.3.5.8 Edge Ports 215
- Switch B 217
- Switch C 217
- Switch D 217
- Switch A 217
- 8.3.6.2 Root Switch 218
- 8.3.6.3 Path-cost 218
- 8.3.6.4 Port-priority 218
- Root Switch 219
- Root Guard 219
- Configuration 219
- Service provider Customer 219
- 8.3.9.1 Hello Time 220
- 8.3.9.2 Forward Delay 221
- 8.3.9.3 Max Age 221
- 8.3.9.4 BPDU Hop 222
- 8.3.9.5 BPDU Filter 222
- 8.3.9.6 BPDU Guard 222
- 8.3.9.7 Self Loop Detection 223
- 8.3.10 Sample Configuration 225
- VLAN 101 ~ 200 226
- 8.4.1 Configuring VRRP 228
- 8.4.1.4 VRRP Track Function 231
- 8.4.1.6 Preempt 233
- 8.5 Rate Limit 234
- 8.5.2 Sample Configuration 235
- 8.6 Flood Guard 236
- 8.7 Bandwidth 237
- 8.8.1 DHCP Server 239
- 8.8.1.1 DHCP Pool Creation 240
- 8.8.1.2 DHCP Subnet 240
- 8.8.1.3 Range of IP Address 240
- 8.8.1.4 Default Gateway 241
- 8.8.1.5 IP Lease Time 241
- 8.8.1.6 DNS Server 242
- 8.8.1.7 Manual Binding 242
- 8.8.1.8 Domain Name 243
- 8.8.1.9 DHCP Server Option 243
- 8.8.1.10 Static Mapping 243
- 8.8.1.13 Authorized ARP 244
- 8.8.2.2 DHCP Class Creation 247
- 8.8.3 DHCP Lease Database 249
- 8.8.4 DHCP Relay Agent 250
- 8.8.5 DHCP Option 82 252
- DHCP Server 253
- DHCP Relay Agent 253
- DHCP Client 253
- 8.8.6 DHCP Client 256
- 8.8.6.5 IP Lease Time 257
- 8.8.6.6 Requesting Option 257
- 8.8.7 DHCP Snooping 258
- 8.8.7.3 DHCP Rate Limit 259
- 8.8.7.4 DHCP Lease Limit 259
- 8.8.8 IP Source Guard 261
- 8.8.9 DHCP Filtering 263
- 8.8.10 Debugging DHCP 264
- 8.9.1 ERP Operation 265
- 8.9.3 Configuring ERP 267
- 8.9.3.2 RM Node 268
- 8.9.3.3 Port of ERP domain 268
- 8.9.3.4 Protected VLAN 268
- 8.9.3.5 Protected Activation 268
- 8.9.3.7 Wait-to-Restore Time 269
- 8.10 Stacking 270
- 8.10.1 Switch Group 271
- 8.10.3 Disabling Stacking 272
- 8.10.6 Sample Configuration 272
- 8.12 Jumbo-frame Capacity 275
- 9 IP Multicast 278
- More than one port 279
- Layer 3 Network 279
- 9.1.6 MRIB Debug 281
- 9.1.7 Multicast Aging 282
- • IGMP Version 1 283
- • IGMP Version 2 283
- • IGMP Version 3 283
- 9.2.2 IGMP Version 2 284
- 9.2.2.4 IGMP v2 Fast Leave 287
- 9.2.3 L2 MFIB 288
- 9.2.5 IGMP v2 Snooping 289
- 「Join message」to join in 290
- 「Leave message」to get out of 290
- 9.2.5.5 Mrouter Port 294
- 9.2.6 IGMP v3 Snooping 297
- 9.2.6.3 Immediate Block 298
- 9.2.7.1 Enabling MVR 299
- 9.2.7.2 MVR Group Address 299
- 9.2.7.3 MVR IP Address 299
- • Source 300
- • Receiver 300
- 『A→B→C→D→C→F』 303
- 『A→B→C→F』 303
- 『A→B→C→D』, but packets 304
- 9.3.1.2 DR Priority 305
- 9.3.1.4 PIM Hello Query 306
- 9.3.2 BSR and RP 307
- 9.3.4 RP Information 308
- 9.3.5 PIM-SM Registration 310
- 9.3.6 SPT Switchover 312
- 9.3.9 PIM-SSM Group 315
- 9.3.10 PIM Snooping 315
- 10 IP Routing Protocol 317
- 10.1.1 Basic Configuration 318
- 10.1.2.1 Summary of Path 320
- 10.1.2.4 Choosing Best Path 321
- 10.1.2.5 Graceful Restart 323
- 10.1.3 IP Address Family 324
- 10.1.4 BGP Neighbor 325
- 10.1.4.3 Route Map 326
- 10.1.4.4 Force Shutdown 326
- 10.1.5 BGP Session Reset 327
- 10.2.1 Enabling OSPF 333
- 10.2.3 Compatibility Support 335
- 10.2.4 OSPF Interface 335
- 10.2.4.1 Authentication Type 336
- 10.2.4.2 Authentication Key 336
- 10.2.4.3 Interface Cost 337
- • Hello Interval 338
- • Retransmit Interval 338
- • Dead Interval 338
- • Transmit Delay 338
- 10.2.4.7 OSPF Priority 340
- 10.2.5 Non-Broadcast Network 341
- 10.2.6 OSPF Area 342
- 10.2.6.5 Area Range 346
- 10.2.6.6 Shortcut Area 346
- 10.2.6.7 Stub Area 347
- 10.2.6.8 Virtual Link 347
- 10.2.7 Default Metric 349
- • grace-period 350
- • helper 350
- 10.2.9 Opaque-LSA Support 351
- 10.2.10 Default Route 351
- 10.2.11 Finding Period 352
- • metric <0-16777214> 353
- • metric-type <1-2> 353
- • route-map MAP-NAME 353
- • tag <0-4294967295> 353
- 10.2.13 OSPF Distance 354
- 10.2.14 Host Route 355
- 10.2.15 Passive Interface 355
- 10.3.3 RIP Version 363
- Global Configuration mode 365
- Router Configuration mode 367
- 10.3.9.3 Offset List 368
- 10.3.11 RIP Network Timer 369
- 10.3.12 Split Horizon 370
- 10.3.13 Authentication Key 370
- 10.3.14 Restarting RIP 371
- 11 System Software Upgrade 373
- 11.2 Boot Mode Upgrade 374
- 11.3 FTP Upgrade 377
- 12 Abbreviations 379
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