switchport trunk native vlan x for PC62xx

Trunk Links attach two VLAN aware switches (or other VLAN aware devices) together and allows for multiple VLAN frames to cross one link.

On VLAN trunk links, all frames must be tagged with the respective VLAN ID’s

The native VLAN must match on all switches in the segment. (VLAN 1 is default Native VLAN).  The native VLAN is NOT tagged.

(config)#interface ethernet xxx

(config-if-xxx)#switchport mode trunk

(config-if-xxx)#switchport trunk allowed vlan add xx, xx

 

There is also a similar option called General Mode.

 

General Links consist of a combination of VLAN Trunk and Access Links.

General Links can have both tagged and untagged frames, However, all frames sent to a specific VLAN must be tagged.  All untagged  frames are sent to the native VLAN.

The native VLAN still applies to the General LINK.  While it is possible to have multiple untagged vlans on a General link, you can only have ONE (1) PVID.  The PVID represents the native VLAN. 

While untagged traffic may be sent via several untagged VLANs, returning untagged traffic will only be received by the PVID and therefore will NOT be forwarded to a specific VLAN.

General links are mostly used today for legacy equipment.  However, on the PowerConnect 62xx series switches, you must use General mode if you want to allow management traffic onto the switch over the PVID.  If you use Trunk mode, you will not have the default VLAN on those ports.  The ports will only allow tagged traffic.

 

If you have a LAG/Port Channel set up you make the configurations on the LAG/Port Channel interface and not the individual Ethernet interfaces.

 

Hope this helps,

 

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