Disabling DHCP Discovery in MITEL 5220

[karthik87]

Hi,

I want to disable DHCP in MITEL 5220 VOIP phone. For this i went to the network-settings and turned off DHCP. I set the IP, MASK, GATEWAY ( all to 0.0.0.0 for my experiment). Now when i reboot the phone it hangs in DHCP discovery.

All i want to know is whether the phone populates its MAC address if there is no IP configured. So i set all the IP configurations to 0 and turned off DHCP. But the phone hangs when i reboot.

Any replies appreciated.

Thanks for your time,

Karthik

 

[james1982]

it hangs on DHCP dicsovery because it is waiting for a DHCP server to assign an IP address. Previously from the description you gave it sounds like the handsets were using static IP settings.

What are you trying to achieve?
What system are they connected to?
What software release?

 

[UncleRalph]

The system requires the phone to have an IP address. That's how it routes it packets to it. Although the 3300 does use a phones MAC address to identify the unique instrument, it can't route anything to it without an IP.

Ralph

 

[LoopyLou]

phone populates its MAC address " ???

The phone is trying to boot and is waiting for an IP address. It doesn't go any further until it gets one.

 

[karthik87]

Actually the phone is connected to a switch. As per the standards both the phone and the switch communicate with the help of LLDP-MED. Now I want to know whether the MAC address of the phone will be populated when there is no IP assigned to the phone in the MIB tables. I am using the basic LLDP MIB and LLDP-MED MIB.

Also want to check whether this use case is a valid use case. Can there be a phone without IP connected to a switch and yet communicate with the switch.

Hope i am clear with my query..

Thanks for the replies,

Karthik

 

[kwbMitel]

Link Layer Discovery Protocol - Media Endpoint Discovery (LLDP-MED) is based on VoIP-specific extensions to the IEEE 802.1AB LLDP standard. LLDP is the IEEE neighbor discovery protocol and allows information to be gathered from network devices such as switches and wireless access points. The information gathered with LLDP, aids in troubleshooting and provides data to management systems so that management systems can create accurate views of the network’s topology.

LLDP-MED allows for information sharing between VoIP endpoints such as IP phones and network devices such as L2 Ethernet switches.

As of 3300 Release 7.0, LLDP-MED can be used to simplify the deployment of IP phones. In Release 7.0 LLDP-MED auto-discovery is supported. This means that IP phones can auto-discover network policy from an LLDP-MED compliant L2 switch to obtain the following network policy information:
• VLAN (802.1.Q) information
• COS L2 Priority (802.1p) information
• DSCP (L3 Priority) information.

LLDP is an alternate method of defining Priority on a network but it does nothing to provide the phone with a means of using said priority.

Note: The device is called an IP phone. It needs an IP address to function.

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Occam's Razor - All things being equal, the simplest solution is the right one.

 

[karthik87]

Thanks KwbMitel for your reply. I was concerned about the use case when an un configured phone is connected to a L2 switch what address does the phone have. Will it be some invalid numbers obtained by DHCP.

Now from your reply it is clear that it makes no sense to connect a phone without IP to a L2 Ethernet Switch.

So this use case is not a valid one from a network management system perspective. Am i right?

 

[kwbMitel]

Will not work, Correct.

*******************************************************
Occam's Razor - All things being equal, the simplest solution is the right one.