BigIron RX Series Configuration Guide
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IEEE 802.1D Spanning Tree Protocol (STP)
12
Root Guard should be configured on all ports where the root bridge should not appear. In this way,
the core bridged network can be cut off from the user network by establishing a protective
perimeter around it.
Once the port stops receiving superior BPDUs, root protect will automatically set the port back to a
FORWARDING state after the timeout period has expired.
NOTE
Root Guard may prevent network connectivity if improperly configured. It needs to be configured on
the perimeter of the network rather than the core.
Enabling STP root guard
A STP Root Guard is configured on a per interfaces basis. To enable a Root Guard, enter a
command such as the following.
BigIron RX
(config)#interface ethernet 5/5
BigIron RX
(config-if-e10000-5/5)spanning-tree root-protect
Syntax: [no] spanning-tree root-protect
Enter the no form of the command to disable STP Root Guard on the port.
Setting the STP root guard timeout period
To configure the STP Root protect timeout period globally, enter a command such as the following.
BigIron RX(config)# spanning-tree root-protect timeout 120
Syntax: spanning-tree root-protect timeout
<timeout in seconds>
The timeout in seconds parameter allows you to set the timeout period. The timeout period may be
configured to anything between 5 and 600 seconds. Default is 30 seconds.
Displaying the STP root guard
To display the STP Root Guard state, enter the show spanning-tree root-protect command.
BigIron RX#show spanning-tree root-protect
Port VLAN Current State
13/6 3 Consistent state
13/9 2 Inconsistent state (29 seconds left on timer)
Syntax: show spanning-tree root-protect
Sample Syslog messages
A Syslog message such as the following is generated after the Root Guard blocks a port.
STP: Root Guard Port 12/21, VLAN 10 inconsistent (Received superior BPDU)
A Syslog message such as the following is generated after the Root Guard unblocks a port.
STP: Root Guard Port 12/21, VLAN 10 consistent (Timeout)
Summary of Contents for Brocade DCX
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Page 72: ...lxxii BigIron RX Series Configuration Guide 53 1001810 01 ...
Page 88: ...16 BigIron RX Series Configuration Guide 53 1001810 01 Searching and filtering output 1 ...
Page 300: ...228 BigIron RX Series Configuration Guide 53 1001810 01 Displaying IP information 7 ...
Page 318: ...246 BigIron RX Series Configuration Guide 53 1001810 01 Deploying a LAG 8 ...
Page 418: ...346 BigIron RX Series Configuration Guide 53 1001810 01 SuperSpan 12 ...
Page 482: ...410 BigIron RX Series Configuration Guide 53 1001810 01 MRP CLI example 14 ...
Page 506: ...434 BigIron RX Series Configuration Guide 53 1001810 01 Displaying VSRP information 15 ...
Page 582: ...510 BigIron RX Series Configuration Guide 53 1001810 01 Viewing Layer 2 ACLs 20 ...
Page 634: ...562 BigIron RX Series Configuration Guide 53 1001810 01 Troubleshooting ACLs 21 ...
Page 642: ...570 BigIron RX Series Configuration Guide 53 1001810 01 Trunk formation 22 ...
Page 746: ...674 BigIron RX Series Configuration Guide 53 1001810 01 Displaying RIP filters 24 ...
Page 808: ...736 BigIron RX Series Configuration Guide 53 1001810 01 Displaying OSPF information 25 ...
Page 938: ...866 BigIron RX Series Configuration Guide 53 1001810 01 Displaying MBGP information 27 ...
Page 950: ...878 BigIron RX Series Configuration Guide 53 1001810 01 Using secure copy 28 ...
Page 988: ...916 BigIron RX Series Configuration Guide 53 1001810 01 Clearing IS IS information 29 ...
Page 1054: ...982 BigIron RX Series Configuration Guide 53 1001810 01 Sample 802 1x configurations 33 ...
Page 1108: ...1036 BigIron RX Series Configuration Guide 53 1001810 01 sFlow 39 ...
Page 1190: ...1118 BigIron RX Series Configuration Guide 53 1001810 01 Displaying RIPng information 44 ...
Page 1270: ...1198 BigIron RX Series Configuration Guide 53 1001810 01 Displaying ACLs 47 ...
Page 1310: ...1238 BigIron RX Series Configuration Guide 53 1001810 01 Displaying OSPFv3 information 48 ...
Page 1382: ...1310 BigIron RX Series Configuration Guide 53 1001810 01 Commands That Require a Reload D ...
Page 1435: ...BigIron RX Series Configuration Guide 1363 53 1001810 01 VSRP E ...
Page 1436: ...1364 BigIron RX Series Configuration Guide 53 1001810 01 VSRP E ...