HP 4108GL Management And Configuration Manual page 252

Configuring for Network Management Applications
CDP
Enabling or Disabling CDP Operation on Individual Ports. In the
factory-default configuration, the switch has all ports enabled and transmit-
ting CDP packets. Disabling CDP on a port prevents that port from sending
outbound CDP packets and causes it to drop inbound CDP packets without
recording their data in the CDP Neighbors table. Suppose, for example, that
switches "A" and "B" in figure 12-12-13 are running CDP, and that port A1 on
switch "A" is connected to port B5 on switch "B". If you disable CDP on port
A1 of switch "A", then switch "B" will no longer receive CDP packets from
switch "A" and switch "A" will drop the CDP packets it receives from switch
"B".
CDP Enabled on Port A1
CDP Enabled on both
ends of the link between
"A" and "B".
CDP Disabled on Port A1
CDP disabled on port A1
of switch "A" (but
enabled on port B5 of
switch "B".
Figure 12-13. Example of Disabling CDP on an Individual Port
(The switch "A" entry in the switch "B" CDP Neighbors table remains until the
cdp holdtime
neighbors
Syntax:
For example, to disable CDP on port A1 of a Switch 4108GL:
Changing the Transmission Interval for Outbound CDP Packets. The
default interval the switch uses to transmit CDP packets describing itself to
other, neighbor devices is 60 seconds. This command changes the interval.
Syntax:
12-22
Port A1
Switch "A"
CDP Neighbor Table
Port | Data
------|------------------
A1 | Switch "B" data
Port A1
Switch "A"
CDP Neighbor Table
-Empty for port A1-
(time-to-live; set in switch "A") expires. Until then, the
command continues to list switch "A" on port B5 of switch "B".)
[no] cdp enable <[ethernet] port-list>
cdp timer <5 . . 254>
Switch "B"
CDP Enabled on Port B5
CDP Neighbor Table
Port | Data
Port B5
------|------------------
B5 | Switch "A" data
Switch "B"
CDP Enabled on Port B5
CDP Neighbor Table
- Empty for Port B5 -
Port B5
show cdp