How Monitor Link Works; Configuring Monitor Link - 3Com 4210 9-Port Configuration Manual

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How Monitor Link Works

Figure 2-2 Network diagram for a Monitor Link group implementation

Switch C is configured with a Monitor Link group, where Ethernet1/0/1 is the uplink port, while

Ethernet1/0/2 and Ethernet1/0/3 are the downlink ports. Switch A is configured with a Smart Link group,

where Ethernet1/0/1 is the master port and Ethernet1/0/2 is the slave port.

If Switch C is not configured with Monitor Link group, when the link for the uplink port Ethernet1/0/1

on Switch C fails, the links in the Smart Link group are not switched because the link for the master

port Ethernet1/0/1 of Switch A configured with Smart Link group operates normally. Actually,

however, the traffic on Switch A cannot be up-linked to Switch E through the link of Ethernet1/0/1.

If Switch C is configured with Monitor Link group and Monitor Link group detects that the link for the

uplink port Ethernet1/0/1 fails, all the downlink ports in the group are shut down; therefore,

Ethernet1/0/3 on Switch C is blocked. Now, Smart Link group configured on Switch A detects that a

link fault occurs on the master port Ethernet1/0/1. Then, Smart Link immediately activates the slave

port Ethernet1/0/2 so that traffic is switched to the backup link.

Currently, member ports of a Monitor Link group cannot be dynamic link aggregation groups.

If the uplink or downlink port in the Monitor Link group is a link aggregation group, you cannot

directly delete this aggregation group or change this aggregation group into a dynamic aggregation

group. To delete this aggregation group, you must first unbind this aggregation group from the

Monitor Link.

2-2, the devices Switch C and Switch D are connected to the uplink device Switch E.

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