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Displaying STP information for an entire device
To display STP information, enter the following command at any level of the CLI.
device#show span
VLAN 1 BPDU cam_index is 3 and the Master DMA Are(HEX)
STP instance owned by VLAN 1
Global STP (IEEE 802.1D) Parameters:
VLAN Root Root Root Prio Max He- Ho- Fwd Last Chg Bridge
ID ID Cost Port rity Age llo ld dly Chang cnt Address
Hex sec sec sec sec sec
1 800000e0804d4a00 0 Root 8000 20 2 1 15 689 1 00e0804d4a00
Port STP Parameters:
Port Prio Path State Fwd Design Designated Designated
Num rity Cost Trans Cost Root Bridge
Hex
1 80 19 FORWARDING 1 0 800000e0804d4a00 800000e0804d4a00
2 80 0 DISABLED 0 0 0000000000000000 0000000000000000
3 80 0 DISABLED 0 0 0000000000000000 0000000000000000
4 80 0 DISABLED 0 0 0000000000000000 0000000000000000
5 80 19 FORWARDING 1 0 800000e0804d4a00 800000e0804d4a00
6 80 19 BLOCKING 0 0 800000e0804d4a00 800000e0804d4a00
7 80 0 DISABLED 0 0 0000000000000000 0000000000000000
<lines for remaining ports excluded for brevity>
Syntax: show span [ vlan vlan-id] | [pvst-mode] | [num] | [detail [vlan vlan-id [ethernet [port] | num]]]
The vlanvlan-id parameter displays STP information for the specified port-based VLAN.
The pvst-mode parameter displays STP information for the device Per VLAN Spanning Tree (PVST+)
compatibility configuration. Refer to PVST/PVST+ compatibility on page 317
The num parameter displays only the entries after the number you specify. For example, on a device
with three port-based VLANs, if you enter 1, then information for the second and third VLANs is
displayed, but information for the first VLAN is not displayed. Information is displayed according to
VLAN number, in ascending order. The entry number is not the same as the VLAN number. For
example, if you have port-based VLANs 1, 10, and 2024, then the command output has three STP
entries. To display information for VLANs 10 and 2024 only, enter show span 1 .
The detail parameter and its additional optional parameters display detailed information for individual
ports. Refer to Displaying detailed STP information for each interface on page 261.
The show span command shows the following information.
CLI display of STP information TABLE 46
Field Description
Global STP parameters
VLAN ID The port-based VLAN that contains this spanning tree (instance of STP). VLAN 1 is the default
VLAN. If you have not configured port-based VLANs on this device, all STP information is for
VLAN 1.
Root ID The ID assigned by STP to the root bridge for this spanning tree.
Root Cost The cumulative cost from this bridge to the root bridge. If this device is the root bridge, then the
root cost is 0.
Root Port The port on this device that connects to the root bridge. If this device is the root bridge, then
the value is "Root" instead of a port number.
Displaying STP information for an entire device
FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide 259
53-1003086-04
- FastIron Ethernet Switch 1
- Platform and Layer 2 1
- Switching 1
- Contents 3
- 53-1003086-04 10
- Document conventions 11
- Notes, cautions, and warnings 12
- Brocade resources 13
- Document feedback 14
- About This Document 15
- Basic Layer 2 Features 17
- About port regions 19
- ICX 6430 device port regions 20
- ICX 6450 device port regions 20
- ICX 6650 device port regions 20
- ICX 7750 device port regions 20
- MAC learning rate control 21
- Multi-port static MAC address 24
- Clearing MAC address entries 25
- Flow-based learning overview 26
- Enabling port-based VLANs 29
- Defining MAC address filters 30
- MAC-notification events 36
- Cut-through switching 43
- FastIron X Series devices 46
- Buffer profile configuration 47
- Configuring buffer profiles 49
- FCX buffer sharing levels 57
- Enabling Link Fault Signaling 64
- Jumbo frame support 65
- Packet InError Detection 65
- Master VLAN and member VLANs 70
- Control ports and free ports 70
- Configuring a topology group 71
- Metro Ring Protocol 73
- Selection of master node 77
- Ring initialization 78
- RHP processing in MRP Phase 1 79
- RHP processing in MRP Phase 2 80
- Adding an MRP ring to a VLAN 85
- Enabling MRP diagnostics 87
- Displaying MRP information 88
- Displaying ring information 89
- MRP CLI example 91
- MRP commands on Switch B 92
- MRP commands on Switch C 92
- MRP commands on Switch D 93
- Master election and failover 95
- VSRP failover 96
- VSRP priority calculation 96
- Track ports 98
- VSRP-aware security features 100
- VSRP parameters 100
- Metro Features 101
- Disabling or re-enabling VSRP 104
- Changing the timer scale 105
- Configuring authentication 106
- Configuring a VRID IP address 107
- Changing the backup priority 108
- Changing the TTL setting 108
- VSRP-aware interoperablilty 112
- Displaying VSRP information 113
- VSRP fast start 116
- VSRP and MRP signaling 117
- UDLD overview 121
- UDLD for tagged ports 122
- Enabling UDLD 123
- Displaying UDLD information 124
- Clearing UDLD statistics 126
- Protected link groups 127
- Link Aggregation 131
- Overview of link aggregation 132
- LAG formation rules 132
- Maximum number of LAGs 135
- Downgrade considerations 137
- LAG Load Sharing 137
- Configuring a LAG 139
- Configuration considerations 140
- Creating a keepalive LAG 142
- Deploying a LAG 144
- Disabling ports within a LAG 145
- Enabling ports within a LAG 145
- IP assignment within a LAG 149
- Displaying LAG information 149
- Multi-Chassis Trunking 155
- How MCT works 156
- MCT terminology 157
- MCT data flow 157
- MCT and VLANs 162
- MCT feature interaction 163
- Basic MCT configuration 164
- Configuring MCT 166
- Step 3: Configure the cluster 168
- Step 4: Configure clients 168
- MCT failover scenarios 170
- Cluster failover mode 171
- Client isolation mode 171
- Using the keep-alive VLAN 172
- Layer 2 behavior with MCT 173
- MAC aging 174
- MAC flush 174
- MAC show commands 175
- MAC clear commands 175
- Dynamic trunks 176
- Port loop detection 177
- MCT Layer 2 protocols 177
- Protocol-based VLANs 178
- Uplink switch 179
- Layer 3 behavior with MCT 183
- Layer 3 unicast over MCT 184
- Device A 185
- Device B 186
- MCT for VRRP or VRRP-E 187
- Displaying MCT information 190
- Displaying STP information 193
- MCT configuration examples 195
- Client 1 - Configuration 196
- Client 2- Configuration 196
- AGG-A (R1) - Configuration 197
- AGG-B (R2) - Configuration 197
- Two-level MCT example 198
- DIST-A (R3) - Configuration 201
- DIST-B (R4) - Configuration 202
- SX800A - MCT configuration 203
- SX800A - VRRP-E configuration 204
- SX800B- MCT configuration 204
- SX800B - VRRP-E configuration 205
- S1-SW configuration 205
- Router-1 configuration 209
- Client-1 - Configuration 210
- Client-2 - Configuration 210
- Client-1 Configuration 211
- Client-2 Configuration 211
- Router-2 configuration 211
- Client-2 configuration 213
- Supported GVRP features 215
- GVRP overview 215
- GVRP application examples 216
- Dynamic core and fixed edge 217
- VLAN names created by GVRP 218
- Configuration notes for GVRP 218
- GVRP configuration 220
- Enabling GVRP 221
- Disabling VLAN advertising 221
- Disabling VLAN learning 222
- Changing the GVRP timers 222
- Displaying GVRP information 224
- Displaying GVRP statistics 229
- Clearing GVRP statistics 231
- GVRP CLI examples 231
- Dynamic core and dynamic edge 232
- Fixed core and dynamic edge 232
- Fixed core and fixed edge 233
- Port mirroring and Monitoring 235
- Monitoring a port 238
- ACL-based inbound mirroring 240
- Destination mirror port 241
- 1. Defining a mirror port 244
- VLAN-based mirroring 245
- Spanning Tree Protocol 251
- STP overview 252
- STP protection enhancement 257
- STP feature configuration 266
- Fast Uplink Span 268
- Active uplink port failure 269
- Bridges and bridge port roles 271
- Assignment of port roles 272
- Point-to-point ports 276
- Bridge port states 276
- Handshake mechanisms 278
- Convergence at start up 289
- Changing port parameters 302
- 802.1W Draft 3 307
- Enabling 802.1W Draft 3 310
- Single Spanning Tree (SSTP) 311
- SSTP defaults 312
- Enabling SSTP 312
- STP per VLAN group 313
- STP load balancing 314
- PVST/PVST+ compatibility 317
- Overview of PVST and PVST+ 318
- VLAN tags and dual mode 319
- Configuring PVST+ support 319
- Enabling dual-mode support 320
- PVST+ configuration examples 321
- PVRST compatibility 323
- BPDU guard 323
- Root guard 326
- Designated Protection 327
- Error disable recovery 328
- Setting the recovery interval 329
- Errdisable Syslog messages 330
- Configuration notes 332
- Setting the MSTP name 335
- Configuring an MSTP instance 336
- Setting point-to-point link 338
- Disabling MSTP on a port 338
- RTR1 on MSTP configuration 339
- Core 1 on MSTP configuration 339
- Displaying MSTP statistics 340
- Supported VLAN features 345
- VLAN overview 346
- Layer 2 port-based VLANs 347
- Configuring port-based VLANs 348
- Modifying a port-based VLAN 351
- Removing a port-based VLAN 352
- Removing a port from a VLAN 352
- Multi-range VLAN 353
- Layer 3 protocol-based VLANs 358
- Default VLAN 361
- 802.1Q tagging 362
- Spanning Tree Protocol (STP) 364
- Virtual routing interfaces 365
- Dynamic ports 367
- Static ports 369
- Super aggregated VLANs 370
- Routing between VLANs 371
- Switches only) 372
- Assigning trunk group ports 374
- Aging of dynamic ports 386
- Configuring a VLAN group 394
- Configuring aggregated VLANs 402
- 802.1ad tagging configuration 406
- Enabling 802.1ad tagging 408
- Example 802.1ad configuration 408
- Private VLAN configuration 410
- Configuring the primary VLAN 415
- Dual-mode VLAN ports 420
- Displaying VLAN information 423
- Displaying PVLAN information 427
- Supported VXLAN features 429
- VXLAN gateway overview 430
- Inner frame VLAN tagging 432
- Load balancing entropy 432
- MAC learning 432
- Quality of Service support 432
- Unsupported features 432
- Configuring VXLAN 433
- VXLAN-related syslog messages 435
- Layer 2 Commands 437
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