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Old 06-24-2015, 08:40 AM
smanjunath smanjunath is offline
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Concern 1: Documentation
---------------------------------------

You can find the procedure for configuring vlans on a port in the documentation

https://downloads.avaya.com/css/P8/documents/101007454
Page 35 - Adding or removing ports in a VLAN



Concern 2: making a "trunk" port _not_ to strip the Default VLAN tag
----------------------------------------------------------------------------------------------------

Whenever you configure a port for trunking / 802.1q you have an option to set a default vlan id on that port. On a tagged port it is expected to receive packets with tag. But whenever you receive a untagged packet on a trunk port we now classify those packets being part of the default vlan id. Switch bridges these packets on the default vlan id path. This is for packets ingressing into a trunk port.

On the egress side again you can send these default vlan id packets as tagged or untagged. By default Avaya switch sends the packets with tag. If you prefer to untag the default vlan id packets then you have to enable the port configuration "UNTAG DEFVLAN"

I have a VSP-4450GSX-PWR+ switch running VSP4000.4.1.0.0.GA software. With default config (UNTAG DEFVLAN - disabled) I am receiving default vlan id packets with tag. Whenever I am enabling the untag default vlan option (UNTAG DEFVLAN - enabled) then switch strips of the vlan tag and sends the packets.


My Topology:
-----------

Laptop1 ---->(1/12) VSP_4K (1/20) ---------> Laptop2

Untagged traffic is sent from Laptop1 and received at Laptop2.

Configurations:
--------------

VSP_4K:1(config)#sho interf gig vlan 1/12,1/20
================================================== ==============================
Port Vlans
================================================== ==============================
PORT DISCARD DISCARD DEFAULT VLAN PORT UNTAG DYNAMIC
NUM TAGGING TAGFRAM UNTAGFRAM VLANID IDS TYPE DEFVLAN VLANS
--------------------------------------------------------------------------------
1/12 enable false false 50 50,150 normal disable P
1/20 enable false false 50 50,150 normal disable P

--------------------------------------------------------------------------------
DYNAMIC VLAN Legend:
P=Protocol enabled.
VSP_4K:1(config)#
VSP_4K:1(config)#interf gig 1/20
VSP_4K:1(config-if)#interf gig 1/20
VSP_4K:1(config-if)#untag-port-default-vlan
VSP_4K:1(config-if)#exit
VSP_4K:1(config)#sho interf gig vlan 1/12,1/20
================================================== ==============================
Port Vlans
================================================== ==============================
PORT DISCARD DISCARD DEFAULT VLAN PORT UNTAG DYNAMIC
NUM TAGGING TAGFRAM UNTAGFRAM VLANID IDS TYPE DEFVLAN VLANS
--------------------------------------------------------------------------------
1/12 enable false false 50 50,150 normal disable P
1/20 enable false false 50 50,150 normal enable P

--------------------------------------------------------------------------------
DYNAMIC VLAN Legend:
P=Protocol enabled.
VSP_4K:1(config)#