Sep 192013
 

LLDP-MED for Avaya CS1000 IP PhonesIncreasing boot efficiency is one of those things I’m working on. My personal or work PC, my IP Phone, systems I manage. The less time I have to spend sitting around waiting for something to boot up is more time doing something productive. On the PC, that involves looking at your startup folder, your registry run folders and removing any unnecessary services from automatic startup.

For Avaya CS1000 IP Phones, that involves looking at the config and determining which features can be added or removed to achieve an optimal boot up sequence.

Although my 4st post is not live yet (when it is, it will be here), in it I cover Link Layer Discovery Protocol (LLDP) and how it applies to Avaya CS1000 IP Phone deployment. On of the biggest inefficiencies I’ve found in CS1000 IP Phone deployments is where customers leave LLDP enabled but don’t use it.

ZzzWaiting for LLDP-MED (Link Layer Discovery Protocol, Media Endpoint Discovery) can add as much as 30 seconds delay to the boot process… So disable it if you’re not using it!

With stickiness, you can configure the Phone to not use LLDP on bootup, or you can disable it manually at each phone by turning it off.

On the other hand, if use LLDP you might increase boot efficiency by distributing the configuration of the IP Phones and reducing dependency upon DHCP. If you want to configure the Voice VLAN but don’t use LLDP, your options are to manually configure each IP Phone or use the VLAN-A option to assign a Voice VLAN ID.

Avaya CS1000 IP Phone, DHCP provisioning behaviorIf you use DHCP though, you’re going to be querying the DHCP server (or multiple servers) multiple times.

It’s certainly faster than waiting for LLDP-MED to time out, but using LLDP-MED is faster than multiple DHCP queries (Although talking a fraction of the delay caused by LLDP-MED being enabled and unused.)

It’s also a good idea to reduce the number of retries to allow the IP Phone to failover to an alternate signaling server (i.e. Connect Server) more quickly.

Take away:

  • If you’re not using a feature, disable it. Your phones will boot faster and you’ll recover more quickly from maintenance windows or disaster.
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