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Trunking
Port trunk allows multiple links to be bundled together and act as a single
physical link for increased throughput. It provides load balancing, and
redundancy of links in a switched inter-network. Actually, the link does not
have an inherent total bandwidth equal to the sum of its component physical
links. Traffic in a trunk is distributed across an individual link within the trunk in
a deterministic method that called a hash algorithm. The hash algorithm
automatically applies load balancing to the ports in the trunk. A port failure
within the trunk group causes the network traffic to 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 Port ID, Source MAC Address,
Destination MAC Address, or a combination of Source MAC Address and
Destination MAC Address to be the selection for Trunk Hash Algorithm. Traffic
pattern on the network should be considered carefully before applying it. When
a proper hash algorithm is used, traffic is kind of randomly decided to be
transmitted across either link within the trunk and load balancing will be seen.
This managed switch supports two trunk group, each trunk consists of 2~4
ports. Trunk hash algorithm can be selected according to 4 different methods.
Figure 7-1
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