We are configuring an IPt network. the switch is a 3750 and the phones (5) are 7942. the strange is that 4 phones are ok while the last phone is not able to get an ip address and the configuration.
the DHCP is in the UCM. The port where is connected the last phone is flapping up-down. In the switch there are some security paramentes (dhcp snooping,arp inspection, verify source....):
ip dhcp snooping vlan 100,102,116-117
no ip dhcp snooping information option
ip dhcp snooping database flash:/DHCP_Snooping_Table_3750
ip dhcp snooping
ip arp inspection vlan 100,116
(.....)
interface FastEthernet1/0/5
description Cisco ip phone + PC (DHCP)
switchport access vlan 100
switchport mode access
switchport voice vlan 116
switchport port-security maximum 2
switchport port-security
switchport port-security aging time 2
switchport port-security violation restrict
switchport port-security aging type inactivity
srr-queue bandwidth share 1 10 70 20
srr-queue bandwidth shape 3 0 0 0
priority-queue out
mls qos trust device cisco-phone
spanning-tree portfast
ip verify source
ip dhcp snooping limit rate 10
we removed all these security features but nothing happens. we tried to move to phone to another port, change the cable or put anothe phone in this port but the situation is always the same
