10-26
Configuring for Network Management Applications
CDP
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:
Figure 10-15. Example of IP Address Selection when a CDP Neighbor Has Multiple VLANs with IP
Addresses
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
show cdp neighbors
command to display a subset of
Neighbor data
■
Using the
walkmib
command to display a listing of the CDP MIB objects
■
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 Series 4100GL switches.
Switch "X"
CDP Enabled on Port A1
CDP Neighbor Table
Port | Data
------|------------------
A1
|
10.28.227.103
Switch "Y"
CDP Enabled on Port C5
CDP Neighbor Table
Port | Data
------|------------------
C5
|
Switch "X" data
Port A1
Port C5
VLAN Membership in Port C5 of Switch "Y" VID
IP Address?
DEFAULT_VLAN (Primary VLAN)
1
No
Blue_VLAN
200
10.28.227.103
Red VLAN
300
10.28.227.88
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.
Summary of Contents for ProCurve 4104GL
Page 2: ......
Page 26: ...xxiv Getting Started Need Only a Quick Start ...
Page 34: ...1 8 Selecting a Management Interface Advantages of Using HP TopTools for Hubs Switches ...
Page 50: ...2 16 Using the Menu Interface Where To Go From Here ...
Page 172: ...8 24 Time Protocols SNTP Messages in the Event Log ...
Page 240: ...10 30 Configuring for Network Management Applications CDP ...
Page 288: ...11 48 Port Based Virtual LANs VLANs and GVRP GVRP ...
Page 480: ...C 38 Troubleshooting Restoring a Flash Image ...
Page 486: ...D 6 MAC Address Management Determining MAC Addresses ...
Page 490: ......
Page 502: ...12 Index ...
Page 503: ......