Vlan-Aware Mac-Based Switching; Back Pressure Support; Auto Negotiation; Broadcast Storm Control - Dell PowerConnect 7048P Manual

Powerconnect 7000 series stackable layer 2 and 3 switches

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VLAN-Aware MAC-based Switching

Packets arriving from an unknown source address are sent to the CPU and

added to the Hardware Table. Future packets addressed to or from this

address are more efficiently forwarded.

On half-duplex links, a receiver may prevent buffer overflows by occupying

the link so that it is unavailable for additional traffic.

Auto negotiation allows the switch to advertise modes of operation. The auto

negotiation function provides the means to exchange information between

two switches that share a point-to-point link segment, and to automatically

configure both switches to take maximum advantage of their transmission

capabilities.

PowerConnect 7000 Series switches enhance auto negotiation by providing

port advertisement. Port advertisement allows the system administrator to

configure the port speeds advertised.

For information about configuring autonegotiation, see "Configuring Port

Characteristics" on page 483.

When Layer 2 frames are forwarded, broadcast, unknown unicast, and

multicast frames are flooded to all ports on the relevant virtual local area

network (VLAN). The flooding occupies bandwidth, and loads all nodes

connected on all ports. Storm control limits the amount of broadcast,

unknown unicast, and multicast frames accepted and forwarded by the

For information about configuring Broadcast Storm Control settings, see

"Configuring Port-Based Traffic Control" on page 687.

Switch Features