HP 8000M - Manual (Page 191)

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Configuring the Switch
Automatic Broadcast Control (ABC) Features
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Reducing RIP and SAP Broadcast Traffic
You can also configure ABC to limit IP RIP and IPX RIP and SAP broadcasts,
which can further reduce broadcast traffic on your network. RIP and SAP
broadcasts are normally forwarded on all ports. However, with ABC enabled
and additional RIP and SAP parameters configured, the switch forwards IP
RIP and IPX RIP and SAP broadcasts only to the ports on which these types
of broadcasts have been received earlier. This means that other ports are
relieved of some unnecessary traffic because the RIP and SAP broadcasts will
be forwarded only to ports where there are routers or servers that would use
the broadcast information.
Automatic Gateway Configuration for Networks Using DHCP
To Manage IP Addresses.
When using ABC, each client in a multi-subnet structure can be configured as
its own gateway so that traffic from the client can be sent directly to target
nodes. (This reduces traffic to and from a multinetted router or it allows inter-
subnet communication without needing a router.)
N o t e If you are using ABC without substituting a switch for a router, or if you are
adding a switch to enhance performance without replacing a router, then
clients do not need to be reconfigured as their own gateways.
You can automatically reconfigure the gateway for clients in a network that
meets the following two conditions:
■ DHCP is the automatic configuration protocol used to manage IP
addresses on the network.
■ the DHCP request travels through the switch on its path to the DHCP
server.
If you are replacing a router with a switch, one of your tasks is to change the
default gateway configuration on all of the clients in the network. Also, some
DHCP servers do not have an option allowing a client to be configured as its
own gateway. The Auto Gateway parameter available with the IP-related ABC
options modifies DHCP replies from the server so that the gateway IP address
will be set to the client’s own IP address.
N o t e Clients may not implement a gateway address change without rebooting.
Thus, after implementing the automatic gateway feature on the switch, reboot
all DHCP clients connected to the switch.