3Com 5500G-EI Command Reference Guide - Page 331
Example, stp root-protection, Syntax, Parameter, Description, con d with Root protection
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RSTP Configuration Commands 335 You can configure no more than one primary root for a spanning tree but you can configure one or more secondary roots for it. You cannot change the bridge priority of a Switch if you configure it as a secondary root of a spanning tree. Example To designate the Switch as a secondary root of the STP, enter the following: system-view System View: return to User View with Ctrl+Z. [SW5500]stp root secondary stp root-protection Syntax stp root-protection undo stp root-protection View Ethernet Port View Parameter None Description Use the stp root-protection command to enable Root protection function on a Switch. Use the undo stp root-protection command to restore the default status of Root protection function. By default, root protection is not enabled. Following incorrect configuration or malicious attack, a legal root of the network may receive a BPDU with higher priority and lose its status as root, which causes problems with the network topology. Such problems may pull the higher-speed traffic to lower-speed links and cause network congestion. To avoid this problem, RSTP provides Root protection function. After being configured with Root protection, a port always stays as a designated port. Once this port receives a BPDU with higher priority, it turns to listening status and will not forward any packets (as if the link to it is disconnected). It will resume normal status if it receives no BPDU with higher-priority for a period of time. Example To enable Root protection function on GigabitEthernet1/0/1 of the Switch, enter the following: system-view System View: return to User View with Ctrl+Z. [SW5500]interface GigabitEthernet1/0/1 [SW5500-GigabitEthernet1/0/1]stp root-protection