Cisco 7937G Administration Guide - Page 97

Conference Station Resets Unexpectedly, Verifying Physical Connection

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Chapter 9 Troubleshooting and Maintenance Conference Station Resets Unexpectedly Conference Station Resets Unexpectedly If users report that their conference stations are resetting during calls or while idle on their desk, you should investigate the cause. If the network connection and Cisco Unified Communications Manager connection are stable, a conference station should not reset on its own. Typically, a conference station resets if it has problems connecting to the Ethernet network or to Cisco Unified Communications Manager. These sections can help you identify the cause of a conference station resetting in your network: • Verifying Physical Connection, page 9-7 • Identifying Intermittent Network Outages, page 9-7 • Verifying DHCP Settings, page 9-7 • Checking Static IP Address Settings, page 9-8 • Verifying Voice VLAN Configuration, page 9-8 • Eliminating DNS or Other Connectivity Errors, page 9-8 • Checking Power Connection, page 9-9 Verifying Physical Connection Verify that the Ethernet connection to which the conference station is connected is up. For example, check if the particular port or switch to which the conference station is connected is down and that the switch is not rebooting. Also make sure that there are no cable breaks. Identifying Intermittent Network Outages Intermittent network outages affect data and voice traffic differently. Your network might have been experiencing intermittent outages without detection. If so, data traffic can resend lost packets and verify that packets are received and transmitted. However, voice traffic cannot recapture lost packets. Rather than retransmitting a lost network connection, the conference station resets and attempts to reconnect its network connection. If you are experiencing problems with the voice network, you should investigate whether an existing problem is simply being exposed. Verifying DHCP Settings Follow this process to help determine if the conference station has been properly configured to use DHCP: 1. Verify that you have properly configured the conference station to use DHCP. See the "Network Configuration Menu" section on page 4-5 for more information. 2. Verify that the DHCP server has been set up properly. 3. Verify the DHCP lease duration. Cisco recommends that you set it to 8 days. Conference stations send messages with request type 151 to renew their DHCP address leases. If the DHCP server expects messages with request type 150, the lease will be denied, forcing the conference station to restart and request a new IP address from the DHCP server. Cisco Unified IP Conference Station 7937G Administration Guide for Cisco Unified Communications Manager 6.0 OL-11560-01 Rev. B0 9-7

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9-7
Cisco Unified IP Conference Station 7937G Administration Guide for Cisco Unified Communications Manager 6.0
OL-11560-01 Rev. B0
Chapter 9
Troubleshooting and Maintenance
Conference Station Resets Unexpectedly
Conference Station Resets Unexpectedly
If users report that their conference stations are resetting during calls or while idle on their desk, you
should investigate the cause. If the network connection and Cisco Unified Communications Manager
connection are stable, a conference station should not reset on its own.
Typically, a conference station resets if it has problems connecting to the Ethernet network or to
Cisco Unified Communications Manager. These sections can help you identify the cause of a conference
station resetting in your network:
•
Verifying Physical Connection, page 9-7
•
Identifying Intermittent Network Outages, page 9-7
•
Verifying DHCP Settings, page 9-7
•
Checking Static IP Address Settings, page 9-8
•
Verifying Voice VLAN Configuration, page 9-8
•
Eliminating DNS or Other Connectivity Errors, page 9-8
•
Checking Power Connection, page 9-9
Verifying Physical Connection
Verify that the Ethernet connection to which the conference station is connected is up. For example,
check if the particular port or switch to which the conference station is connected is down and that the
switch is not rebooting. Also make sure that there are no cable breaks.
Identifying Intermittent Network Outages
Intermittent network outages affect data and voice traffic differently. Your network might have been
experiencing intermittent outages without detection. If so, data traffic can resend lost packets and verify
that packets are received and transmitted. However, voice traffic cannot recapture lost packets. Rather
than retransmitting a lost network connection, the conference station resets and attempts to reconnect its
network connection.
If you are experiencing problems with the voice network, you should investigate whether an existing
problem is simply being exposed.
Verifying DHCP Settings
Follow this process to help determine if the conference station has been properly configured to use
DHCP:
1.
Verify that you have properly configured the conference station to use DHCP. See the
“Network Configuration Menu” section on page 4-5
for more information.
2.
Verify that the DHCP server has been set up properly.
3.
Verify the DHCP lease duration. Cisco recommends that you set it to 8 days.
Conference stations send messages with request type 151 to renew their DHCP address leases. If the
DHCP server expects messages with request type 150, the lease will be denied, forcing the
conference station to restart and request a new IP address from the DHCP server.