Native VLAN: (Dot1q trunk links)

Unanswered Question
Jan 21st, 2009
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Switches in the network are using VLan:100 as the management VLAN, with a SVI configured on all switches.

VLAN:1 SVI is shutdown on all switches security)

Q. What native VLAN should I use for the dot1q trunk links? What is the advantage/disadvantage (Cisco best practice) for using VLAN:100 or the default VLan:1 as the native VLAN.

Please advice

### Switches ###

management interface VLAN:100

Core SW:

Edge SW1:

Edge SW2:

interface vlan 1

description "shutdown"


interface vlan 100

description "MGMT"

ip address 10.100.....

vlan 100

name MGMT

### Option 1 ###

interface g0/1

switchport trunk encapsulation dot1q

switchport mode trunk

no shutdown

### option 2 ###

interface g0/1

switchport trunk encapsulation dot1q

switchport mode trunk

switchport trunk native vlan 100

no shutdown

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Overall Rating: 5 (1 ratings)
Jon Marshall Wed, 01/21/2009 - 05:24
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Cisco best practice is to use a completely separate vlan for the native vlan ie. the native vlan should not be

1) vlan 1

2) your management vlan

3) any vlan with end user devices in it

So create a new unused vlan (we used to use vlan 999 at my last place of work). Do not create a L3 SVI for it because it doesn't need one. And then configure this as the native vlan on your trunk links.



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