Upvel UP-316FEW — понимание агрегации портов для повышения производительности сети [41/52]

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UP-308FEW / UP-316FEW

Trunking

Link Aggregation (Port Trunking) allows multiple links to be bundled together and act as a

single physical link. It provides higher throughput, load balancing, fault tolerance and

redundancy of links in a switched internetwork.

Traffic in a trunk is distributed across an individual link within the trunk in a deterministic

method that is called a hashing algorithm. The hashing algorithm automatically applies load

balancing to the ports in the trunk. In the event of a port failure within the trunk group the

network traffic will be directed to the remaining ports. Load balancing is maintained whenever

a link in a trunk is lost or returned to service. This switch may use Source MAC Address or a

combination of Source MAC Address and Destination MAC Address for the Trunk Hashing

Algorithm.

If the traffic pattern on the network is considered carefully and a proper hashing algorithm is

used, the traffic is kind of randomly decided to be transmitted across either link of the trunk

and load balancing will be seen.

Before making any physical connections between devices, it is necessary to configure the

link aggregation parameters of the devices at both ends. When using link aggregation, take

into account the following:

• The ports used in a link aggregation must all be for the same media type

(e.g. RJ-45, 100 Mbps).

• The ports can only be assigned to one link aggregation group.

• The ports at both ends of a connection must be configured as link aggregation ports.

• None of the ports in a link aggregation group (trunk) can be configured as a mirror source

port or a mirror target port.

• Enable the link aggregation prior to connecting cables between the switches to prevent

creating a switching loop.

• Disconnect all link aggregation port cables or disable the link aggregation ports before

removing a port link aggregation group to prevent creating a switching loop.

You can configure 2 link groups with a maximum of 4 ports aggregated in each group. If the

group is defined as a local static link aggregation group, then the number of ports must be

the same as the group member ports.

User Manual 41