LevelOne ProCon GSW-1290, Руководство пользователя

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LevelOne GSW-1290 Gigabit Layer2 SNMP Switch
Link Aggregation
Link aggregation 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.
Link aggregation is most commonly used to link a bandwidth intensive network device or devices – such as
a server – to the backbone of a network.
The Switch allows the creation of up to six link aggregation groups, each group consisting of up of up to
eight links (ports). The aggregated links must be contiguous (they must have sequential port numbers)
except the two (optional) Gigabit ports – which can only belong to a single link aggregation group. A link
aggregation 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
aggregated links 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 link
aggregation group.
Load balancing is automatically applied to the ports in the aggregated 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 link aggregation 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 link aggregation group. If two redundant link aggregation 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.
To configure port trunking, click on the
LACP hyperlink in the Configuration folder and then click Link
Aggregation :
Figure 4- 4. Port Trunking Group table
To configure port trunk groups, click the Add button to add a new trunk group and then use the Port
Trunking Configuration window below to set up trunk groups. To change or delete a port trunk group,
click the Modify or Delete option in the Current Trunking Group Entries table pictured above.
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