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Configuring the Switch
Configurable Features
Configuring the Switch
Automatic Broadcast Control (ABC) Features—Layer 3
Switching
ABC reduces the amount of IP and/or IPX broadcast traffic on a network by
enabling the switch to serve as a proxy for the ultimate destination of broad-
cast IP ARP and RIP packets, and IPX NSQ, and RIP or SAP packets. This
reduces the number of ports over which IP and/or IPX broadcasts are sent,
increases the amount of network bandwidth available for other purposes, and
can reduce the need for routers within a network. These factors can lower
costs and reduce latency in the network. (While communication between
VLANs—broadcast domains—still requires a router, ABC functions within
VLANs and, by using multiple subnets per VLAN (multi-netting), can reduce
or eliminate the need for routers within the VLAN.)
When enabled, ABC also allows you to set the broadcast limit parameter
(Bcast Limit) in the Port Configuration screen (figure 3-5) for all ports on
the switch (or all ports on the VLAN, if VLANs are configured and ABC is
enabled for the VLAN).
In the factory default state, ABC is disabled. For more information on ABC
and how to configure it, refer to “Automatic Broadcast Control (ABC)” on page
7-30.
SEDONA.BK : sed_3.fm5 Page 23 Thursday, February 27, 1997 10:11 AM