Troubleshooting guide

Troubleshooting Guide
70
DHCP Discovery
OR
DHCP OFFER X REJ
(VLAN) (after releasing the
first IP from the native
DHCP server)
DHCP Option 43 or 125 on 3300
Release 7.0 or later systems or
Option 30 (MITEL IP PHONE) for
earlier Releases is not program-
med on the second scope of the
DHCP server (or on the second
DHCP server).
OR
VLAN ID is not assigned
properly.
1. Identify if there is one DHCP server for both
VLANs, or if there is one DHCP server per
VLAN (see “Network Configuration
Examples” in the “Typical Network
Configurations” chapter of the MCD
Technician’s Handbook).
2. For one DHCP server for both VLANs,
ensure that option 43 or 125 is properly
configured (3300 Release 7.0 and later) or
that option 130 is programmed as String type
with value of “MITEL IP PHONE“ (prior to
Release 7.0), in the scope of Voice LAN.
3. For one DHCP server per VLAN, ensure that
option 43 or 125 (Release 7.0 and later) or
130 (prior to Release 7.0) is defined.
4. Verify that the proper VLAN ID is assigned in
option 43 or 125 (Release 7.0 and later), or
132 (prior to Release 7.0).
One DHCP server for two VLANs
network configuration: IP helper
address on the router interface is
not set up correctly.
1. On the router interface (on which DHCP is
not residing), enter the IP helper address
and specify the IP address of the DHCP
server on the other side of the subnet (that is,
always set up IP helper address on the
DHCP server client side).
2. Ensure the second scope is created for the
corresponding VLAN (see “Network
Configuration Examples” in the “Typical
Network Configurations” chapter of the MCD
Technician’s Handbook).
Table 18: IP Phone Registration Troubleshooting
Error Message on
Display
Possible Cause Corrective Action
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