Cabletron Systems SmartSTACK ELS100-S24TX2M, Management Manual, Page: 79 / 102

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Configuring & Monitoring the Switch 79
Configuring Port Trunks
You can configure up to three port trunks on the ELS100-S24TX2M
switch, or 12 for the entire stack. Each trunk can combine up to four ports
into an aggregate connection with up to 800 Mbps of bandwidth when
operating at full duplex. Besides balancing the load across each port in
the trunk, the additional ports provide redundancy by taking over the load
if another port in the trunk should fail.
To configure the port trunks, do the following:
1. Select the Device Control Menu from the Main Menu.
2. Select Port Trunking Configuration.
3. Enter a Trunk ID number from 1 to 12 to identify the trunk.
4. Select up to four ports to configure as one trunk. You can configure
up to three trunks per switch unit. The ports used for each trunk must
all be on the same internal switch chip.
The port groups permitted include:
Group 1 Group 2 Group 3
1,2,3,4, 5,6,7,8, 9,10,11,12,
13,14,15,16 17,18,19,20 21,22,23,24
Note that ports at both ends of a trunk must be configured in an
identical manner, including speed, duplex mode, and VLAN
assignments.
5. For each Trunk ID, select Enable to enable the trunk.
Note that it is advisable to enable the trunk prior to connecting any
cable between the switches to avoid creating a loop.
When using port trunks, remember that:
• Before removing a port trunk via the configuration menu, you must
disable all the ports in the trunk or remove all the network cables.
Otherwise, a loop may be created.
• To disable a single link within a port trunk, you should first remove the
network cable, and then disable both ends of the link via the
configuration menu. This allows the traffic passing across that link to
be automatically distributed to the other links in the trunk, without
losing any significant amount of traffic.