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8-/16-/24-Port 10/100 PoE PSE Web Smart Switch
724-746-5500 l www.blackbox.com
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802.1w RSTP recommended value: (Valid range: 1–200,000,000)
10 Mbps: 2,000,000
100 Mbps: 200,000
Figure 4-28. STP Port Settings screen.
4.9 Trunking
The switch supports two kinds of port trunking methods, LACP and Static.
Function name: Link Aggregation Settings
Function description: There are two groups to choose from and the maximum for each group is 4 ports. Use the
Trunking configuration to configure the Link Aggregation settings. You can bundle more than one port with the same
speed, full duplex and the same MAC to be a single logical port, and the logical port aggregates the bandwidth of these
ports. This means you can apply your current Ethernet equipments to build the bandwidth aggregation. For example, if
there are three Fast Ethernet ports aggregated in a logical port, then this logical port has bandwidth three times as high as
a single Fast Ethernet port has.
Parameter description: System Priority: This is for the LACP system priority and only valid when you choose LACP link
aggregation. Use it to set the priority part of the LACP system ID. LACP will only aggregate together the ports whose peer
link partners are all on a single system. Each system that supports LACP will be assigned a globally unique System
Identifier for this purpose. A system ID is a 64-bit field consisting of a 48-bit MAC Address and 16-bit priority value. The user
can set the System Priority. Its range is from 1 to 65535. Default: 32768.
NOTE: LACP stands for Link Aggregation Control Protocol. The trunking ports using LACP (according to IEEE 802.3ad
specification) as their trunking method can choose their unique LACP GroupID (1–4) to form a logic “trunked port.” The
benefit of using LACP is that a port makes an agreement with its peer port before it becomes a ready member of a “trunk
group” (also called aggregator). LACP is safer than the other trunking method, static trunk.
The switch LACP does not support the following:
- Link Aggregation across switches