The Catalyst 6000 and the Catalyst 4000 switches support a special multiservice port to connect to the Cisco IP phones. The Catalyst 3500 series XL switches provide the same level of functionality as the multiservice ports using the standard IEEE 802.1Q trunk ports.
I want to know when I configure voice vlan in catalyst 3550, the interface should be configure as catalyst 3500 xl(trunk port) or catalyst 4000( access port)? Can someone give me some doc about how to configure catalyst 3550's port to forward voice and data traffic on different virtual LANs ?
whereas IP phone and PC will be on seperate VLANs, then the switchport should be configured as a layer 2 802.1q trunk port:
switchport mode trunk
switchport trunk encap dot1q
swithport trunk native vlan X (data vlan #)
switchport voice vlan Y (voice vlan #)
There's no difference between how the CAT4K/6K handles voice vlan and how the 35xx does it, the only difference is the CLI syntax where CAT4K/6K uses "auxilary vlan" and the 35xx uses "voice vlan". Both are standard 802.1Q trunks.
3550 also has layer 3 capabilities, please note that the configuration listed above only apply to layer 2 trunk ports on the 3550.
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