3com WXR100 3CRWXR10095A ユーザーズマニュアル

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Dual-Homed Direct and Distributed Connections to WX Switches
Figure 11 shows an example of a dual-homed configuration in which one 
MAP connection is direct and the other is distributed over the network. 
Figure 11   Dual-Homed Direct and Distributed Connections to WX Switches
In this example, the MAP port 1 is directly connected to a WX. The MAP 
always attempts to boot first from the directly connected WX. The MAP 
attempts to boot using MAP port 2 only if the boot attempt on port 1 
fails. If the active data link fails, the WX reboots using the other link.
MAP port 1
Network
backbone
WX switch
MAP port 2
WX switch
WX switch
WX switch