Troubleshooting guide

Troubleshooting Guide
196
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 66 if DHCP or TFTP fails.
Waiting for DHCP
Booting: 04.02.01.06
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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 3300 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.
9. If the data included in the Ack does include a VLAN ID and packet
Priority value, the set discards DHCP data and sends an untagged
Release.
DHCP: Releasing
Booting: 04.02.01.06
---------------------
Vlan x Priority x
Booting: 04.02.01.06
10.The set goes through the Discovery/Offer/ Request/Ack sequence
again.The packets sent are tagged to include VLAN and Priority
values supplied by the first DHCP server.
11.The TFTP server downloads the boot image and displays the set
IP address. If there is no boot image, the set jumps to Step 13.
Refer to Table 67 for a description of possible error messages.
xx.xx.xx.xx
Downloading
12.The boot file is copied to flash if it is a different version than the
one in flash.
Upgrading Flash
DO NOT POWER DOWN
13.If the boot load is the same as in flash, it is not copied. xx.xx.xx.xx
Upgrade not required
Table 64: IP Phone Boot Sequence(continued)
Boot Sequence Phone Display
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