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C
ONFIGURING
THE
P
HONE
11.4 LLDP-MED
The telephones have support for Link Layer Discovery Protocol for
Media Endpoint Devices (LLDP-MED), which can for example be used
to get the VLAN identity or the emergency location identification number
(ELIN). In this section it is only the VLAN identity that is described. For
information about ELIN, see Administrator Guide for Aastra Models
6700i and 9000i Series IP SIP Phones.
Note:
If LLDP is not used in the network, LLDP can be disabled in the
aastra.cfg file, which means that the telephone will start much
faster.
Previously, Aastra IP Phones had a 5 second timer for listening to
LLDP-MED responses when the phone is booting up. If LLDP-MED
responses are received after this initial listening period, the phone will
not get access to the telephony VLAN. If there is an untagged LAN, the
phone will use it and may be hanging in a DHCP negotiation.
Dependant on when the phone was manufactured, this problem can still
occur at new installation. If this problem occurs, the recommendation is
to set the timer in the LAN switch temporarily to 5 seconds, start the
phones with an aastra.cfg file where the time (parameter
lldp startint-
erval
) is changed to match the time in the LAN switch at ordinary opera-
tion for example 32 seconds. When the phones are started, the timer
shall be changed back to the original value in the LAN switch.
The example below shows which parameters to set in aastra.cfg:
# LLDP enabled = default
lldp: 1
# LLDP update interval 30 s
lldp interval: 30
# Controls the LLDP start interval, 32 s
lldp startinterval: 32
The parameter
lldp startinterval
is only valid during the phone bootup
process and it will control the LLDP time-out interval where the phone
sends LLDP advertisements and listens for the LLDP responses from
the switch before proceeding to the DHCP stage. The default value of
this parameter is 32 seconds.
For more detailed information see Administrator Guide for Aastra
Models 6700i and 9000i Series IP SIP Phones.
11.5
Enabling / Disabling DHCP
Follow the steps below to enable or disable DHCP:
