Although i have a 3com, I have a cisco IP Phone. I have the IP Phone connected to the 3com swithport using a hybrid port. It's a tagged member of vlan3 (voice net) and an untagged member of vlan1(native data)
The ip phone gets the right DHCP address for vlan3 ( 10.x.x.x ) but the laptop connected to the ip phone gets the IP for vlan 3 as well.
I want the laptop to get the IP of the native vlan ( 192.168.x.x)
what would the port setup need to be ? does it need to be a trunk ? i have the PVID of the port set to vlan3, this allows the IP phone to get its vlan3 DHCP address.
any help would be greatly appreciated.
The 3com OS is very similar to the latest of CISCO IOS'.
so explain wtih syntax and i'm sure the 3com can relate.
Cisco IP Phones use CDP to discover the Voice VLAN (the VLAN Tag they should use to transmit packets). Other Vendors use DHCP Vendor Options in the UnTagged VLAN (access VLAN) to discover the Voice VLAN. I don't think Cisco IP Phones can discover the Voice VLAN any other way than CDP (or manually configured), so unless your 3Com switches support CDP you won't be able to automatically tell the Cisco IP Phones what the Voice VLAN is.
Based on your description of a 'Hybrid Port' this sounds like Cisco's 'Multi-VLAN Port' that was a feature of the 2900XL/3500XL series switches. This feature has however long since gone......
With a Cisco switch an access port supporting an Access VLAN & a Voice VLAN is effectively a Trunk with only one Tagged VLAN and the Native VLAN:
switchport mode access
switchport access vlan 10
switchport voice vlan 100
This results in the same configuration as:
switchport mode trunk
switchport trunk encapsulation dot1q
switchport trunk native vlan 10
switchport trunk allowed vlan 100
With the exception of CDP packets being sent advertising the Voice VLAN.
With regards to other IP Phone vendors and DHCP Vendor Options - the answer is it depends....
Nortel use Vendor Option 144 to inform the IP Phone of the Voice VLAN and Option 128 for the Server (PBX) to use. Ericsson uses Vendor Option 43 that can be configured to tell the IP Phone the VLAN and the Web server to read the config file from.
I don't think you will get this working automatically with your 3Com switches, you can however manually configure the VLAN on the Cisco IP Phones.
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