3com 8807 사용자 가이드

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HAPTER

 17: MSTP R

EGION

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CONFIGURATION

designated port begin to send data again. That is, the root port and designated 
port should undergo a transitional state for a period of Forward Delay before they 
enter the forwarding state.

And thus, the packets of a VLAN will be forwarded along the following path: in 
the MST region, the packets will be forwarded along the corresponding MSTI; 
among the regions, the packets will be forwarded along the CST.

MSTP is compatible with STP and RSTP. The MSTP switch can recognize both the 
STP and RSTP packets and calculate the spanning tree with them. Besides the basic 
MSTP functions, 3Com Ethernet Switch Series also provide some features easy to 
manage from users’ point of view. These features include root bridge hold, 
secondary root bridge, ROOT protection, BPDU protection, loop protection, hot 
swapping of the interface modules, master/slave switchover, and so on. Note that 
the spanning tree needs to be calculated again when a master/slave switchover 
occurs.

MSTP configuration includes:

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Only after MSTP is enabled on the device will other configurations take effect. 
Before enabling MSTP, you can configure the related parameters of the device and 
Ethernet ports, which will take effect upon enabling MSTP and stay effective even 
after resetting MSTP. The check region-configuration command can display the 
region parameters that have not yet taken effect. The display 
current-configuration command shows the parameters configured before MSTP 
is enabled. For those configured after MSTP is enabled, you can use the related