Mitel 50005070 Instruction Manual download pdf (Page 292)

282

SX-200 ICP MX Technician’s Handbook

DHCP Discovery

DHCP OFFER X

REJ

(VLAN) (after

releasing the first IP

from the native

DHCP server)

The DHCP server is

acting up and cannot

assign IP addresses for

the corresponding

subnet even though

there are enough IP

addresses.

For a Microsoft DHCP server, reboot the

server.

For the controller internal DHCP server,

disable DHCP and rebuild the scope.

The L2 switch port for

the phone interface is

shut down or not

configured properly.

Check the L2 switch and ensure that the

port is not shut down.

For a Cisco L2 switch, ensure that this is a

trunk port with Dot1q encapsulation, and

that this trunk port allows both native and

Voice LAN to pass through.

For an HP L2 switch, ensure that Native

Lan is untagged, and that Voice LAN is

tagged

The L2 switch port for

the router interface is

shut down or not

configured properly.

Identify if there are two physical interfaces

to the router (one per VLAN), or a router on

a stick configuration (one physical with

virtual sub- interfaces).

Ensure that the port(s) on both sides (L2

switch and router) are not shut down.

If there is a physical interface on the router

for each VLAN, make sure that the L2

switch is set to access port for the

corresponding VLAN/ subnet correctly. OR

If there is one physical interface on the

router for multiple VLANs, ensure that this

is a trunk port on the L2 switch, and ensure

that this trunk port allows both native and

voice LAN to pass through.

On the router subinterface, ensure that the

proper VLAN is associated to the remote

subinterface.

The DHCP server does

not have enough IP

addresses.

Create a larger scope with more IP

addresses on the DHCP server.

Table 59: IP Phone Registration Troubleshooting (continued)

Error Message on

Display

Probable Cause Corrective Action

(Page 3 of 5)

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