Hello, I did. I tried to disable 'voice vlan' and put the phone in plain access vlan and disabled cdp. Still the same. Phone ignores DHCPOFFER. Any more ideas? Thanks,
Michael -----Original Message----- From: Dionisios Karopoulos [mailto:d.karopou...@connecticore.com] Sent: Tuesday, August 8, 2017 2:38 AM To: 'Michael Ulitskiy' Cc: cisco-nsp@puck.nether.net Subject: RE: [c-nsp] Cisco IOS DHCP server problem Hello, Try disabling cdp/lldp towards the ip phone and see if it helps. Kind Regards, Dennis -----Original Message----- From: cisco-nsp [mailto:cisco-nsp-boun...@puck.nether.net] On Behalf Of Michael Ulitskiy Sent: Monday, August 7, 2017 10:06 PM To: cisco-nsp@puck.nether.net Subject: [c-nsp] Cisco IOS DHCP server problem Hello, I'm sorry to ask such a probably basic question, but I'm at loss. I have a very trivial setup: router (3825, IOS 15.0(1)M10) - switch (3750, IOS 12.2(50)SE5) - ip phone (7962, firmware SCCP42.9-3-1SR3-1S) For some reason the phone can't get ip address and I have no clue why. It looks like it discards router's DHCPOFFER. Here's what I'm getting in debugging after phone powering up: c199-41133# Aug 7 14:35:50: DHCPD: client's VPN is . Aug 7 14:35:50: DHCPD: DHCPDISCOVER received from client 010c.d996.9043.99 on interface GigabitEthernet0/0.20. Aug 7 14:35:50: DHCPD: Sending DHCPOFFER to client 010c.d996.9043.99 (10.10.15.38). Aug 7 14:35:50: DHCPD: broadcasting BOOTREPLY to client 0cd9.9690.4399. c199-41133# Aug 7 14:35:54: DHCPD: client's VPN is . Aug 7 14:35:54: DHCPD: DHCPDISCOVER received from client 010c.d996.9043.99 on interface GigabitEthernet0/0.20. Aug 7 14:35:54: DHCPD: Sending DHCPOFFER to client 010c.d996.9043.99 (10.10.15.38). Aug 7 14:35:54: DHCPD: broadcasting BOOTREPLY to client 0cd9.9690.4399. c199-41133# Aug 7 14:36:02: DHCPD: client's VPN is . Aug 7 14:36:02: DHCPD: DHCPDISCOVER received from client 010c.d996.9043.99 on interface GigabitEthernet0/0.20. Aug 7 14:36:02: DHCPD: Sending DHCPOFFER to client 010c.d996.9043.99 (10.10.15.38). Aug 7 14:36:02: DHCPD: broadcasting BOOTREPLY to client 0cd9.9690.4399. The config is very basic, subnet is directly attached, no dhcp relays: Router: ip dhcp pool DHCP-VOIP network 10.10.15.0 255.255.255.0 default-router 10.10.15.1 dns-server 10.10.15.1 ! interface GigabitEthernet0/0.20 description VOIP VLAN encapsulation dot1Q 20 ip address 10.10.15.1 255.255.255.0 no ip redirects no ip proxy-arp ip verify unicast source reachable-via rx 1 ip nat inside ip virtual-reassembly ! Switch: interface FastEthernet2/0/8 description Universal computer/phone port switchport access vlan 10 switchport mode access switchport voice vlan 20 spanning-tree portfast I did some googling, I found several people complaining about similar problem, but no solution. Does anyone have any idea what might be wrong here or how to further troubleshoot it? Thanks a lot, Michael _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/