A controller is connected to a Cisco Catalyst switch. The switch port configuration looks like this:
interface GigabitEthernet 1/0/10
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,20,30,50
switchport trunk native vlan 20
switchport mode trunk
Which controller CLI command assigns its management interface to the native VLAN interface of the Cisco Catalyst switch?
A.
config interface vlan management 0
B.
config interface vlan management 1
C.
config interface vlan management 20
D.
config interface vlan management 30
E.
config interface vlan management 50
Explanation:
Ans should be A….but somewhere the ans is c ?? confused!
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Yes … the correct is A
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The switch is set to use vlan 20 as native vlan on its dot1q trunk.
For the controller Cisco says:
“Enter 0 for an untagged VLAN or a nonzero value for a tagged VLAN.”
http://www.cisco.com/en/US/docs/wireless/controller/7.0/configuration/guide/c70mint.html#wp1120860
So “config interface vlan management 20” is the right answer.
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If we choose “Config vlan management 20”
Vlan 20 will be taged, but in sw part vlan 20 is native and on-taged.
Confused!!!
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Answer is correct
A zero value for the VLAN identifier (on the Controller > Interfaces page) means that the interface is untagged.
The default (untagged) native VLAN on Cisco switches is VLAN 1. When controller interfaces are configured as tagged (meaning that the VLAN identifier is set to a nonzero value), the VLAN must be allowed on the 802.1Q trunk configuration on the neighbor switch and not be the native untagged VLAN.
From Cisco Wireless LAN Controller Configuration Guide, Release 7.0
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Enter 0 for an untagged VLAN or a nonzero value for a tagged VLAN
With the command switchport trunk native vlan 20 we indicate that the traffic for vlan 20 will be untagged.
So this is correct
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