HP ProCurve Series 4100GL Management And Configuration Manual page 240

Configuring for Network Management Applications
CDP
Switch "A"
CDP
(CDP Running)
CDP Neighbor Table
Port | Data
-------|--------------------
A1 | Host 1 data
A1 | Host 2 data
A1 | Host 3 data
A2 | Switch "B" data
Switch "B"
CDP
(CDP Running)
CDP Neighbor Table
Port | Data
-------|--------------------
B1 | Switch "A" data
B7 | Switch "C" data
No CDP data for Switch
"D" because it has dis
abled CDP operation.
Switch "C"
CDP
(CDP Running)
CDP Neighbor Table
Port | Data
-------|--------------------
C3 | Switch "B" data
Figure 11-12. Example of Incoming CDP Packet Results
11-28
and "E" are not neighbors because the intervening CDP-disabled switch "D"
does not forward CDP packets; i.e. is not transparent to CDP traffic. (For the
same reason, switch "E" does not have any CDP neighbors.)
Port A1
Non-CDP Device "X"
Such as a Non-CDP
Port A2
Non-CDP Device "Y"
Such as a Non-CDP
Hub or Switch
Port B1
Port B5
This switch drops CDP packets.
Port B7
Port C3
"A", "1", "2", and "3" are CDP neighbors.
"A" and "B" are CDP neighbors.
"B" and "C" are CDP neighbors.
Because "D" is CDP-capable, but has
disabled CDP, it is not a CDP neighbor
to either "B" or "E".
Hub or Switch
Port D3
Switch "D"
CDP-Disabled
(No CDP Neighbor Table)
Port D17
Workstation "1"
CDP
(Host 1)
(CDP Running)
Workstation "2"
CDP
(Host 2)
(CDP Running)
Workstation "3"
CDP
(Host 3)
(CDP Running)
Switch "E"
CDP
(CDP Running)
CDP Neighbor Table
Empty-No CDP
Neighbors
Port E1