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Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
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Chapter 12 Configuring Dynamic VLAN Membership with VMPS
VMPS Example
Troubleshooting VMPS
Table 12-2 shows the VMPS error messages that you might see when you enter the set vmps state
enable or the download vmps command.
After VMPS successfully downloads the VMPS database configuration file, it parses the existing file on
the VMPS server and builds a database. When the parsing is complete, VMPS displays statistics about
the total number of lines parsed and the number of parsing errors.
To obtain more information on VMPS parsing errors, set the syslog level for VMPS to 3 using the set
logging level vmps command.
Troubleshooting Dynamic Ports
A dynamic port might shut down under these circumstances:
• VMPS is in secure mode, and it is illegal for the host to connect to the port. The port shuts down to
prevent the host from connecting to the network.
• More than 50 active hosts reside on a dynamic port.
To reenable a dynamic port that has been shut down, enter the set port enable command.
When you move a PC from a hub that is connected to the switch to a direct port on the VMPS client,
both ports remain assigned to the same VLAN.
The VMPS query and response messages are multicast packets with a destination address
of 01000CCCCCCD.
VMPS Example
Figure 12-1 shows a network with a VMPS server switch, two backup VMPS servers, and VMPS client
switches with dynamic ports. In this example, the following assumptions apply:
• The VMPS server and the VMPS client are separate switches.
• Switch 1 is the primary VMPS server.
Table 12-2 VMPS Error Messages
VMPS Error Message Recommended Action
TFTP server IP address is not configured. Specify the TFTP server address using the set vmps tftpserver
ip_addr [filename] command.
Unable to contact the TFTP server 172.16.254.222. Enter a static route (using the set ip route command) to the
TFTP server.
File “vmps_configuration.db” not found on the TFTP
server 172.16.254.222.
Check the filename of the VMPS database configuration file on
the TFTP server. Verify that the permissions are set correctly.
Failed to download VMPS configuration file. Out of
memory.
The VMPS database file might have more than 256 different
VLANs specified. Reduce the number of VLANs that are used
in the file.
Download aborted. File size larger that download
buffer
The VMPS database file is longer than 21051 lines. If possible,
shorten the file.
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