Cisco Catalyst 2950 Software Guide

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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter8 Configuring VLANs
How the VMPS Works
Administering and Monitoring the VMPS
You can display information about the VMPS by using the privileged EXEC show vmps command. The
switch displays the this information about the VMPS:
Troubleshooting Dynamic Port VLAN Membership
The VMPS shuts down a dynamic port under these conditions:
• The VMPS is in secure mode, and it will not allow the host to connect to the port. The VMPS shuts
down the port to prevent the host from connecting to the network.
• More than 20 active hosts reside on a dynamic port.
To reenable a shut-down dynamic port, enter the interface configuration no shutdown command.
Dynamic Port VLAN Membership Configuration Example
Figure 8-6 shows a network with a VMPS server switch and VMPS client switches with dynamic ports.
In this example, these assumptions apply:
• The VMPS server and the VMPS client are separate switches.
• The Catalyst 5000 series Switch 1 is the primary VMPS server.
• The Catalyst 5000 series Switch 3 and Switch 10 are secondary VMPS servers.
• The end stations are connected to these clients:
– Catalyst 2950 Switch 2
– Catalyst 3500 XL Switch 9
• The database configuration file is called Bldg-G.db and is stored on the TFTP server with the IP
address 172.20.22.7.
VMPS VQP Version The version of VQP used to communicate with the VMPS. The switch queries
the VMPS that is using VQP version 1.
Reconfirm Interval The number of minutes the switch waits before reconfirming the
VLAN-to-MAC-address assignments.
Server Retry Count The number of times VQP resends a query to the VMPS. If no response is
received after this many tries, the switch starts to query the secondary VMPS.
VMPS domain server The IP address of the configured VLAN membership policy servers. The switch
sends queries to the one marked current. The one marked primary is the primary
server.
VMPS Action The result of the most recent reconfirmation attempt. The reconfirmation
attempt can happen automatically when the reconfirmation interval expired, or
you can force it by entering the privileged EXEC vmps reconfirm command or
its Cluster Management Suite or SNMP equivalent.

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz