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.
Back Pressure Support
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
PowerConnect M6220, M6348, M8024, and M8024-k 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 491.
Broadcast Storm Control
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 691.