Cdp Neighbor Data And Mib Objects - HP Procurve 2650 Management And Configuration Manual

Configuring for Network Management Applications
CDP
Switch "X"
CDP Enabled on Port A1
CDP Neighbor Table
Port | Data
------|------------------
A1 | 10.28.227.103
Thus, CDP switch "X" detects CDP switch "Y" on port A1 and shows 10.28.227.103 in its CDP table entry because in CDP switch "Y" the
Primary VLAN does not have an IP address and the Blue_VLAN has a lower VID than the Red_VLAN.
Figure 10-15. Example of IP Address Selection when a CDP Neighbor Has Multiple VLANs with IP
Addresses
10-26
4. If a CDP switch does not detect an IP address on the connecting port of
a CDP neighbor, then the loopback IP address is used (127.0.0.1).
For example, in figure 10-15, port A1 on CDP switch "X" is connected to port
C5 on CDP neighbor switch "Y", with the indicated VLAN configuration on
port C5:
Port A1

CDP Neighbor Data and MIB Objects

The switch places the data received from inbound CDP packets into its MIB
(Management Information Base). This data is available in three ways:
Using the switch's
I
Neighbor data
I Using the walkmib command to display a listing of the CDP MIB objects
I Electronically, using an SNMP utility designed to search the MIB for
CDP data
As shown under "Viewing the Switch's Current CDP Neighbors Table" on page
10-20, you can list a subset of data for each CDP device currently found in the
switch's CDP Neighbors table. Table 10-2, "CDP Neighbors Data", describes
the CDP Neighbor data set available in the Switches 2650 and 6108.
VLAN Membership in Port C5 of Switch "Y" VID
DEFAULT_VLAN (Primary VLAN)
Blue_VLAN
Red VLAN
Switch "Y"
CDP Enabled on Port C5
CDP Neighbor Table
Port | Data
Port C5
------|------------------
C5 | Switch "X" data
command to display a subset of
show cdp neighbors
IP Address?
1 No
200 10.28.227.103
300 10.28.227.88