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Port trunking allows several ports to be grouped together
and to act as a single link. This gives a bandwidth that is a
multiple of a single link's bandwidth.
Port trunking is most commonly used to link a bandwidth
intensive network device or devices – such as a server – to
the backbone of a network.
The VH-2402-L3 allows the creation of up to 6 port trunking
groups, each group consisting of up of up to 8 links (ports).
The trunked ports must be contiguous (they must have
sequential port numbers) except the two (optional) Gigabit
ports – which can only belong to a single port trunking group.
A port trunking group may not cross an 8 port boundary,
starting with port 1 (a group may not contain ports 8 and 9,
for example) and all of the ports in the group must be
members of the same VLAN. Further, the trunked ports
must all be of the same speed and should be configured as
full-duplex.
The configuration of the lowest numbered port in the group
becomes the configuration for all of the ports in the
aggregation group. This port is called the Master Port of the
group, and all configuration options – including the VLAN
configuration – that can be applied to the Master Port are
applied to the entire port trunking group.
Load balancing is automatically applied to the ports in the
trunked group, and a link failure within the group causes the
network traffic to be directed to the remaining links in the
group.
The Spanning Tree Protocol will treat a port trunking group
as a single link, on the switch level. On the port level, the
STP will use the port parameters of the Master Port in the
calculation of port cost and in determining the state of the
port trunking group. If two redundant port trunking groups
are configured on the switch, STP will block one entire group
– in the same way STP will block a single port that has a
redundant link.
80 VH-2402-L3 Management Guide
9033691-01
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