Trunking Configuration; Gsm-2108/Gsm-1008Sfp - Waters Network Systems GSM2108 Operating Manual

5.20

Trunking Configuration

The Port Trunking Configuration is used to configure the settings of Link Aggregation. More than
one port can be bundled with the same speed, full duplex and the same MAC to be a single
logical port. The logical port aggregates the bandwidth of these ports. This means you can
apply your current Ethernet equipment 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.
The switch supports two types of port trunking methods:
LACP:
Ports using Link Aggregation Control Protocol (according to IEEE 802.3ad specification) as their
trunking method can choose their unique LACP GroupID (1~8) 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 followings:
⎯
Link Aggregation across switches
⎯
Aggregation with non-IEEE 802.3 MAC link
⎯
Operating in half-duplex mode
⎯
Aggregate the ports with different data rates
Static Trunk:
Ports using Static Trunk as their trunk method can choose their unique Static Group ID (also
1~8, this Static group ID can be the same with another LACP group ID) to form a logic "trunked
port". The benefit of using Static Trunk method is that a port can immediately become a member
of a trunk group without handshaking with its peer port. This is a disadvantage because the
peer ports of the static trunk group may not know that they should be aggregate together to
form a "logic trunked port". Using Static Trunk on both end of a link is strongly recommended.
Low speed links will stay in "not ready" state when using static trunk to aggregate with high
speed links.
Waters Network Systems
Figure 5.47 – STP Port Configuration
User's Manual

GSM-2108/GSM-1008SFP

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