SignaMax 065-7851 Technical Information Page 165

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SIGNAMAX a.s.
Seat: Palackeho trida 38, 612 00 Brno, CZ l Office: Vlarska 22, P. O. Box 214, 658 14 Brno, CZ
T:+420 533 338 854 l F:+420 533 338 883 l www.signamax.eu
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3-11. Trunking Configuration
The Port Trunking Configuration is used to configure the settings of Link Aggregation.
You can bundle more than one port with the same speed, full duplex and the same MAC to
be a single logical port, thus 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.
The switch supports two kinds 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
GroupID (also 1~8, this Static groupID can be the same with another LACP
groupID)
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 any
handshaking with its peer port. This is also a disadvantage because the peer ports
of your 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. Please also note that low speed links will stay in “not ready” state
when using static trunk to aggregate with high speed links.
As to system restrictions about the port aggregation function on the switch,
In the management point of view, the switch supports maximum 8 trunk groups for LACP
and additional 8 trunk groups for Static Trunk. But in the system capability view, only 8
“real trunked” groups are supported. An LACP trunk group with more than one ready
member-ports is a “real trunked” group. An LACP trunk group with only one or less than one
ready member-ports is not a “real trunked” group. Any Static trunk group is a “real trunked”
group.
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