CUCM 12.5 DHCP - VMware ESXi 6.5 - uplink/trunk to Cisco 3750 switch - Multi VLANs - 8845 Phones not pulling IP

[fourier.ross1]

Running CUCM 12.5 on ESXi 6.5 host. CUCM will be DHCP for phones. Using 3750 switch with mulitple vlans (100, 102 & 202) trunked to the virtual switch on ESXi host. My issue phones are not pulling IP. I can statically assign IP to phones and they register to CM without issue. Can ping all VLANS interfaces without issue. Configs are as follows:

3750 Switch

interface FastEthernet1/0/15
switchport access vlan 202
switchport mode access
switchport voice vlan 102
spanning-tree portfast
!
interface FastEthernet1/0/16
switchport access vlan 202
switchport mode access
switchport voice vlan 102
spanning-tree portfast

!

interface GigabitEthernet1/0/1
description TRUNK TO ESXi HOST
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100,102,202
switchport mode trunk
switchport nonegotiate
switchport voice vlan 102
spanning-tree portfast

Interface Brief:

Interface IP-Address OK? Method Status Protocol
Vlan1 unassigned YES manual up up
Vlan100 142.100.64.254 YES NVRAM up up
Vlan102 142.102.64.254 YES NVRAM up up
Vlan202 142.202.64.254 YES NVRAM up up

FastEthernet1/0/15 unassigned YES unset up up
FastEthernet1/0/16 unassigned YES unset up up

GigabitEthernet1/0/1 unassigned YES unset up up

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa1/0/1, Fa1/0/5, Fa1/0/6
Fa1/0/7, Fa1/0/8, Fa1/0/9
Fa1/0/10, Fa1/0/11, Fa1/0/12
Fa1/0/13, Fa1/0/14, Fa1/0/17
Fa1/0/18, Fa1/0/19, Fa1/0/20
Fa1/0/21, Fa1/0/22, Fa1/0/23
Fa1/0/24, Fa1/0/25, Fa1/0/26
Fa1/0/27, Fa1/0/28, Fa1/0/29
Fa1/0/30, Fa1/0/31, Fa1/0/32
Fa1/0/33, Fa1/0/34, Fa1/0/35
Fa1/0/36, Fa1/0/37, Fa1/0/38
Fa1/0/39, Fa1/0/40, Fa1/0/41
Fa1/0/42, Fa1/0/43, Fa1/0/44
Fa1/0/45, Fa1/0/46, Fa1/0/47
Fa1/0/48, Gi1/0/3, Gi1/0/4
100 VLAN0100 active Fa1/0/2, Fa1/0/3, Fa1/0/4
102 VLAN0102 active Fa1/0/15, Fa1/0/16, Gi1/0/2
202 VLAN0202 active Fa1/0/15, Fa1/0/16
1002 fddi-default act/unsup
1003 token-ring-default act/unsup

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1004 fddinet-default act/unsup
1005 trnet-default act/unsup

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
100 enet 100100 1500 - - - - - 0 0
102 enet 100102 1500 - - - - - 0 0
202 enet 100202 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0

[Jaime Valencia]

Might be hitting

After Upgrading CUCM From 11.5 to 12.5, DHCP is not working.
CSCvp46990

[fourier.ross1]

Thanks for the speedy reply. I will check this out.

[fourier.ross1]

---

@Jaime Valencia wrote:

Might be hitting

After Upgrading CUCM From 11.5 to 12.5, DHCP is not working.
CSCvp46990

---

I checked out this bug but in my situation this was a fresh install of 12.5. Also looking at available software downloads the only version for 12.5 is the one mentioned having the bug. Is there an ES release for this issue?

[Mike_Brezicky]

Does the voice VLAN (102) have an IP Helper assigned? Or how are the phone looking to CUCM for dhcp?

Example:

interface Vlan102
description IP_PHONE
ip address 10.0.0.1 255.255.248.0
ip helper-address 10.0.0.2

[fourier.ross1]

Hey Mike,

Thanks for your response. My fault I forgot to include the vlan configs off the switch in my original post. To answer your question yes I have ip-helper configured. See below....

!
interface Vlan1
description Management
no ip address
ip helper-address 142.100.64.11
!
interface Vlan100
ip address 142.100.64.254 255.255.255.0
ip helper-address 142.100.64.11
!
interface Vlan102
ip address 142.102.64.254 255.255.255.0
ip helper-address 142.100.64.11
!
interface Vlan202
ip address 142.202.64.254 255.255.255.0

[Mike_Brezicky]

ok, so I assume the phones can reach the CUCM, which again I assume is the ip help address. What is your DHCP configuration like in CUCM?

Also, for a test, you can try and configure a quick DHCP scope on the 3750 switch with option 150 set. If a phone pulls an address from here and registered, you can focus on CUCM being the culprit.

[fourier.ross1]

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@Mike_Brezicky wrote:
ok, so I assume the phones can reach the CUCM, which again I assume is the ip help address. What is your DHCP configuration like in CUCM?

Also, for a test, you can try and configure a quick DHCP scope on the 3750 switch with option 150 set. If a phone pulls an address from here and registered, you can focus on CUCM being the culprit.

---

Mike...

The CUCM DHCP config is as follows

DHCP SERVER INFO

Host Server 142.100.64.11

Primary TFTP (option 150) 142.100.64.11

DHCP SUBNET INFO

DHCP Server 142.100.64.11

Subnet IPv4 Address 142.102.64.0

Primary Start IPv4 Address 142.102.64.20

Primary End IPv4 Address 142.102.64.50

Primary Router IPv4 Address 142.102.64.254

IPv4 Subnet Mask 255.255.255.0

Primary TFTP Server IPv4 Address(Option 150) 142.100.64.11

As you suggested, I will configure a DHCP scope on the 3750 this evening and let you know the results.

Appreciate your response!

[fourier.ross1]

Forgot to mention I can statically assign IP to phones and they register to CUCM(142.100.64.11) without issue. I can ping all VLAN interfaces with no issues.

[fourier.ross1]

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Created a DHCP scope on the 3750 switch for VLAN 102 phones. All phones pulled IP and registered with CUCM 12.5. So I would assume there is an issue with DHCP on CUCM 12.5. Any ideas??

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