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Old 06-18-2015, 09:49 AM
sbilde sbilde is offline
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Join Date: Jun 2015
Location: Dallas, TX
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Default VSP4000 VLAN tagging

I'm testing various VLAN modes on VSP400 and have difficulties making a "trunk" port _not_ to strip the Default VLAN tag from outgoing packets.

Testbed:
There is a single VSP4450 rel 4.1 and two laptops with IPs 10.1.1.1/8 and 10.1.1.2/8 connected to 1/1 and 1/2

First surprise is that there is almost nothing on how to configure VLANs on a port in the most recent doc collection or anywhere else.
There seem to be two commands: encapsulation dot1q and vlan tagging tagall to switch between Trunk and Access modes.

Anyway, ports are trunks now, untag default VLAN is disabled.

Code:
VSP-4450GSX-PWR+:1(config)#sh interfaces gigabitEthernet vlan

================================================================================
                                   Port Vlans
================================================================================
PORT          DISCARD DISCARD   DEFAULT VLAN         PORT     UNTAG    DYNAMIC
NUM   TAGGING TAGFRAM UNTAGFRAM VLANID  IDS          TYPE     DEFVLAN  VLANS
--------------------------------------------------------------------------------
1/1   enable  false   false     50      50,150       normal   disable  P
1/2   enable  false   false     50      50,150       normal   disable  P
1/3   disable false   false     1       1            normal   disable  P
1/4   disable false   false     1       1            normal   disable  P
...
There shall be no ping between 1/1 and 1/2 since all the incoming packets are tagged with PVID and all the outgoing packets shall be tagged as well.
Yet the ping continues.
Enabling/disabling untag-port-default-vlan makes no difference.

Assumptions?

Last edited by sbilde; 06-19-2015 at 11:06 AM.