Native Vlan absence scenario

[knaik99]

Hi,

A.if in LAN network,Vlan 1 is shut down and Vlan 950 is management Vlan and Native Vlan is not configured in Lan network then if Untagged traffic comes on any switch then what will happen--

1.will that traffic carry by Vlan 950 I.E. Management Vlan

2.will that traffic drop by switch

B,if wireless AP management VLAN in LAN is 990 and native vlan is not there then who will forward untagged traffic by AP in LAN network

[Filip Knezevic]

Remember that native VLAN can be changed per port and it needs to be changed per port in some situations.

If the management VLAN is tagged, it can't transport untagged frames. You would need to tag control frames on the switch.

If you configure APs, it's usually done in a way that you have one network as native network for management.

So if you have a switchport going to AP, you would configure it in following fashion:

switchport fa0/10

description TO_AP

switchport mode trunk

switchport trunk allowed vlan 10,20,950

switchport trunk native vlan 950

In this way, your management network would provide MGMT for AP, and Data and Guest networks would be tagged.

"If wireless AP management VLAN in LAN is 990 and native vlan is not there then who will forward untagged traffic by AP in LAN network". If you didn't tag VLAN 990 on AP, it just wouldn't work. AP would send untagged frames to switch and switch wouldn't know they are destined for VLAN 990, since it's tagged on port. Again, you would need to use switchport trunk native vlan 990 to make it work.

HTH..