Programming instructions

204
3300 ICP Technician’s Handbook
Troubleshoot the Network
IP Trunking
LAN
Tip: To rule out DHCP problems, and isolate network-related issues, we
recommend that you program the IP Phone with a static IP Address (see
“Setting Static IP Address on IP Display Set” on page 54).
Table 21: IP Trunk Troubleshooting
Symptoms Probable cause Corrective Action
IP trunk does not
recover after router
crash
ICMP redirect is
enabled.
1. On the RTC shell, use routeShow
to identify the addition RouteHost
entries, then use routeDelete to
remove the entry.
2. For a permanent solution:
• Make sure that the route has a
“permanent” static route to the
remote IP trunk network.
• Turn IP redirect off.
• Turn on the routing protocol
between local router and ISP
router.
Table 22: LAN Troubleshooting
Symptoms Probable cause Corrective Action
Device fails to
transmit data.
Packet collision. Refer to “Troubleshooting Using L2
Statistics” in the System
Administration Tool OnLine Help.
Data packet is
altered between
transmit and
receive.
CRC/FCS and
alignment errors
Receiving device
counts an error.
Frame length
errors.