Programming instructions

225
Troubleshooting
IP Phone Boot Sequence
After you connect an IP Phone to the network, it goes through the following
boot sequence (this applies to Release 5.0 and later):
Tip: MAC Addresses, and Main and Boot versions in the following table are
examples for illustration purposes. The numbers displayed at the install site
may be different. The x’s are IP Address, VLAN, and Priority place holders.
Table 30: IP Phone Boot Sequence
Boot Sequence Phone Display
1. Waiting for an Ethernet link to be
established.
Waiting for LAN link
to come up
2. If an Ethernet link is not established,
continue with the bootup process.
Bad LAN link
Check Ethernet cable
3. The first stage for bootup.
Note: Refer to Table 31 on page 227 for
802.1x Port Access Control messages.
08-00-0F-AA-BB-CC
Booting: 04.02.01.06
4. IP Phone contacts DHCP server to obtain IP
address and VLAN information and a list of
the controller addresses in the network.
Note: Go to Table 32 if DHCP or TFTP fails.
Waiting for DHCP
Booting: 04.02.01.06
---------------------
DHCP: Discovery
Booting: 04.02.01.06
5. The internal DHCP server provides one of
these options:
An external DHCP server provides one of
these options:
(where n is the number of the sub-option if
encapsulation is used for the option.)
Using option 125
Using option 43
Using option 128+
---------------------
Using option 125:n
Using option 43:n
6. The DHCP server on the default VLAN
responds with an Offer. If Option 43 or 125
(or option 130 prior to Release 7.0) is not
properly set on the server, the set awaits
further Offers (n is offer number).
DHCP: Offer n Rej
Booting: 04.02.01.06
---------------
DHCP: Offer n Acc
Booting: 04.02.01.06
7. The set replies with a Request and the
server replies with an Acknowledgement.
DHCP: Ack
Booting: 04.02.01.06
8. If the data in the Ack does not contain a
VLAN ID and a packet Priority value, the set
retains DHCP data, jumps to Step 11.
(Page 1 of 3)