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C
HAPTER
2: O
PTIMIZING
B
ANDWIDTH
Aggregated Links
Aggregated links are connections that allow devices to communicate
using up to two links in parallel. Aggregated links are supported on the
10/100/1000BASE-T ports only
.
These parallel links provide two benefits:
■
They can potentially double the bandwidth of a connection.
■
They can provide redundancy — if one link is broken, the other link
can share the traffic for that link.
Figure 1
shows two Switches connected using an aggregated link
containing two member links. If the ports on both Switch units are
configured as 1000BASE-T and they are operating in full duplex, the
potential maximum bandwidth of the connection is 2 Gbps.
Figure 1
Switch units connected using an aggregated link
.
Aggregated Links and
Your Switch
Each Switch supports up to two aggregated links. Each aggregated link
can support up to two member links.
When setting up an aggregated link, note that:
■
The ports at both ends of a member link must be configured as
members of an aggregated link.
■
A member link port can only belong to one aggregated link.
■
The member link ports can have different port configurations within
the same aggregated link, that is, auto-negotiation, port speed, and
duplex mode. However, please note the following:
■
To be an active participant in an aggregated link the member link
ports must operate in full duplex mode. (If a member link port does
not operate in full duplex mode it can still be a member of an
aggregated link but it will never be activated.)
Switch
Switch
Aggregated Link