3Com 3824 Implementation Guide - Page 23

If you wish to disable a single member link of an aggregated link,

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Aggregated Links 23 ■ The member link ports can be mixed media, that is fiber and/or twisted pair ports within the same aggregated link. ■ The member link ports must have the same configuration. ■ Member links must retain the same groupings at both ends of an aggregated link. For example, the configuration in Figure 5 will not work as Switch A has one aggregated link defined whose member links are then split between two aggregated links defined on Switches B and C. Note that this illegal configuration could not occur if LACP is enabled. Figure 5 An illegal aggregated link configuration To make this configuration work you need to have two aggregated links defined on Switch A, one containing the member links for Switch B and one containing the member links for Switch C. When using an aggregated link, note that: ■ To gather statistics about an aggregated link, you must add together the statistics for each port in the aggregated link. ■ If you wish to disable a single member link of an aggregated link, you must first physically remove the connection to ensure that you do not lose any traffic, before you disable both ends of the member link separately. If you do this, the traffic destined for that link is distributed to the other links in the aggregated link. If you do not remove the connection and only disable one end of the member link port, traffic is still forwarded to that port by the aggregated link port at the other end. This means that a significant amount of traffic may be lost.

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Aggregated Links
23
■
The member link ports can be mixed media, that is fiber and/or
twisted pair ports within the same aggregated link.
■
The member link ports must have the same configuration.
■
Member links must retain the same groupings at both ends of an
aggregated link. For example, the configuration in
Figure 5
will not
work as Switch A has one aggregated link defined whose member
links are then split between two aggregated links defined on Switches
B and C. Note that this illegal configuration could not occur if LACP is
enabled.
Figure 5
An illegal aggregated link configuration
To make this configuration work you need to have two aggregated links
defined on Switch A, one containing the member links for Switch B and
one containing the member links for Switch C.
When using an aggregated link, note that:
■
To gather statistics about an aggregated link, you must add together
the statistics for each port in the aggregated link.
■
If you wish to disable a single member link of an aggregated link, you
must first physically remove the connection to ensure that you do not
lose any traffic, before you disable both ends of the member link
separately. If you do this, the traffic destined for that link is distributed
to the other links in the aggregated link.
If you do not remove the connection and only disable one end of the
member link port, traffic is still forwarded to that port by the
aggregated link port at the other end. This means that a significant
amount of traffic may be lost.