It doesn't and I don't see why it would need it as both data and voip vlans are properly moved over trunk between the switch and the router via tagged traffic. Also, like I said before, I don't think data/voip vlan distinction matters in this case as I tried to put phone in plain access vlan with cdp disabled and that didn't help. Anyway, the customer got out of patience and I was forced to put static ip in the phone. So this mystery will stay unsolved for the time being...
Thanks, Michael On Wednesday, August 09, 2017 09:16:05 AM Dionisios Karopoulos wrote: > On second look, > > I don’t see your routers interface (Gi0) having a native vlan to be able to > move untagged traffic between itself and the switch. Usually ip phones get > dhcp from data vlan. > > Try changing voice subnet to something else and give x.x.15.0/24 to data > vlan and see if that works. > > Kind Regards, > Dennis > > > -----Original Message----- > From: Michael Ulitskiy [mailto:[email protected]] > Sent: Tuesday, August 8, 2017 6:19 PM > To: Dionisios Karopoulos <[email protected]> > Cc: [email protected] > Subject: RE: [c-nsp] Cisco IOS DHCP server problem > > 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:[email protected]] > Sent: Tuesday, August 8, 2017 2:38 AM > To: 'Michael Ulitskiy' > Cc: [email protected] > 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:[email protected]] On Behalf Of > Michael Ulitskiy Sent: Monday, August 7, 2017 10:06 PM > To: [email protected] > 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 [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp archive at > http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
