HP 8000M - Manual (Page 192)

6-116
Configuring the Switch
Automatic Broadcast Control (ABC) Features
C
o
n
fig
u
rin
g
th
e
Sw
itc
h
The Auto Gateway parameter does not affect operation of hosts on the same
port as the DHCP server. This is because such hosts receive responses directly
from the server instead of responses from the switch. To prevent this problem,
connect the DHCP servers directly to the switch.
Figure 6-74. DHCP Server Responses Must Come Through the Switch
Restrictions
■ Default Gateway Configuration: For inter-subnet communication to
operate properly in a multi-subnet structure in which there are no routers,
all IP hosts in the network or VLAN must be their own default gateways.
This means that in an IP host, the IP address of the default gateway must
be the IP address assigned to that IP host. Refer to “Automatic Gateway
Configuration for Networks Using DHCP To Manage IP Addresses” on
page 6-115. For troubleshooting information, see “Automatic Broadcast
Control Problems” on page 8-6.
■ Automatic Gateway Configuration: Operates only for hosts designed
and configured for the Bootp/DHCP Router Option (Option 3, as described
in RFC 2132). Other hosts must be manually configured.
■ Switch Meshing: To use ABC with switch meshing, all edge switches in
the mesh must have ABC enabled. This is because proxy replies from the
switch are not sent out meshed ports. For more on ABC operation with
other switch features, see HP’s ProCurve Networking site at the following
URL on the World Wide Web:
http://www.hp.com/go/procurve
By using Auto
Gateway, the
gateway
addresses on
these PCs will
automatically
change to
match their IP
addresses.
Switch with ABC
and Auto Gateway
Configured
100Mbps Hub
100Mbps Hub
Server
Running
DHCP
PC
PC
PC
PC
PC
The IP addresses on these PCs will not
change because they receive their
responses directly from the server.