Vlans between Cisco 3750 stack and HP 2915

[temp31415]

Hello,

I have a new HP 2915 switch that I'm trying to connect to an existing stack of Cisco Catalyst  3750 switches. I am having some difficulty getting one of the 2915 switches to talk to our Cisco stack. There are two primary  VLANs we use. VLAN 1 is our internal network using 192.168.0.0/24 and VLAN 2 is our DMZ network using 172.16.0.0/24. The routing between the two VLAN's is done by our Fortigate Router/Firewall.  I don't have any problems adding devices that should be on VLAN 1 to the HP 2915 switch. I tried adding a DMZ device to port 1 on the 2915 and another to port 2. I set these ports as untagged for VLAN 2. Port 9 is the uplink port to the Cisco Stack and is untagged for VLAN 1 and tagged for VLAN 2. The two DMZ devices can talk to each other but not to other devices on the DMZ VLAN.

 I'm sure I'm missing something simple. I'd appriciate it if anyone could point me in the right direction.

The 2915 is connected to interface GigabitEthernet1/0/23 on the Cisco stack. Here is the config for that interface: description US HP 2915

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,2,1002-1005

switchport mode trunk

Here is the config for the HP 2915:

hostname "US2915"
no stack
ip default-gateway 192.168.0.1
vlan 1
   name "DEFAULT_VLAN"
   untagged 3-10
   ip address 192.168.0.222 255.255.0.0
   no untagged 1-2
   exit
vlan 2
   name "DMZ"
   untagged 1-2
   ip address 176.16.0.16 255.255.0.0
   tagged 9
   exit
password manager
password operator

Thanks greatly in advance!

[Richard Litchfield]

Do you need to set the native VLAN on the Cisco for VLAN 1 (or is VLAN 1 native by default)?

[temp31415]

Richard,

I believe VLAN 1 is the native VLAN on the Cisco switch as well. Ports that aren't configured for DMZ traffic or other switches look like this:

interface GigabitEthernet1/0/24
 switchport mode access
 no mdix auto
 spanning-tree portfast

Thanks!