Draytek P2260 - page 79

VigorSwitch P2260 User’s Guide 73

Admin Point To Point: We say a port is a point-to-point link, from RSTP’s view, if

it is in full-duplex mode but is shared link if it is in

half-duplex mode. RSTP fast convergence can only happen

on point-to-point links and on edge ports. This can expedite

the convergence because this will have the port fast transited

to forwarding state.

There are three parameters, Auto, True and False, used to

configure the type of the point-to-point link. If configure this

parameter to be Auto, it means RSTP will use the duplex

mode resulted from the auto-negotiation. In today’s switched

networks, most links are running in full-duplex mode. For

sure, the result may be half-duplex, in this case, the port will

not fast transit to Forwarding state. If it is set as True, the

port is treated as point-to-point link by RSTP and

unconditionally transited to Forwarding state. If it is set as

False, fast transition to Forwarding state will not happen on

this port.

Default: Auto

MCheck: Migration Check. It forces the port sending out an RSTP

BPDU instead of a legacy STP BPDU at the next

transmission. The only benefit of this operation is to make

the port quickly get back to act as an RSTP port. Click <M

Check> button to send a RSTP BPDU from the port you

specified.

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:

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:

¾ Link Aggregation across switches

¾ Aggregation with non-IEEE 802.3 MAC link

¾ Operating in half-duplex mode

¾ Aggregate the ports with different data rates