HP J3245A User Manual download pdf (Page 136)

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Advanced Concepts

Automatic Broadcast Control (ABC)

Advanced Concepts

Automatic Broadcast Control (ABC)

ABC helps to conserve bandwidth and processing power for IP and/or IPX

traffic within a broadcast domain without adding the levels of cost and latency

normally associated with routers. ABC achieves this by using the switch to

reduce IP ARP and RIP broadcast traffic and IPX NSQ, RIP, and SAP broadcast

traffic normally found on a network. Also, when enabled, ABC allows you to

set the global broadcast limit (Bcast Limit parameter) for all ports on the

switch (or, if VLANs are configured, for all ports in the specified VLAN).

How ABC Operates

Reducing ARP Broadcast Traffic. When enabled on the switch or a VLAN,

ABC does the following to reduce ARP (Address Resolution Protocol) broad-

cast traffic:

1. Learning which port various hosts reside on by reading the address

information in broadcast ARP (Address Resolution Protocol) packets and

unicast ARP response packets

2. Proxy responding to subsequent ARP broadcast requests for those hosts

from other devices instead of forwarding such requests out all ports and

requiring each host to respond

For example, assume that host A has traffic for host D.

Figure 7-17. Example of a Network Using ABC

Switch

Hub Hub

Server #1

Server #2

Host A Host B Host C Host D

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HP J3245A User Manual Page 136