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Can't configure "switchport trunk encapsulation dot1q"

Cisco Router, Firewall, VPN, SDM, ASA and Switch

Can't configure "switchport trunk encapsulation dot1q"

Postby blin » Thu Dec 11, 2014 5:06 pm

Q: when I configure "switchport trunk encapsulation dot1q" on a new Cisco Switch 2960-x, I receive "Invalid input detected at '^' marker" message as shown below. Why?
2960II(config-if)#switchport trunk encapsulation dot1q
% Invalid input detected at '^' marker.

Dec 11 22:00:27.516: %SYS-5-CONFIG_I: Configured from console by console
2960II#sh int g1/0/1 cap
2960II#sh int g1/0/1 capabilities
Model: WS-C2960X-48TS-L
Type: 10/100/1000BaseTX
Speed: 10,100,1000,auto
Duplex: half,full,auto
Trunk encap. type: 802.1Q
Trunk mode: on,off,desirable,nonegotiate
Channel: yes
Broadcast suppression: percentage(0-100)
Flowcontrol: rx-(off,on,desired),tx-(none)
Fast Start: yes
QoS scheduling: rx-(not configurable on per port basis),
tx-(4q3t) (3t: Two configurable values and one fixed.)
CoS rewrite: yes
ToS rewrite: yes
UDLD: yes
Inline power: no
SPAN: source/destination
PortSecure: yes
Dot1x: yes

A: Newer devices don't support ISL so you can only run 802.1Q. That means that there is no need for an encapsulation command because only one encapsulation is supported. If the device had support for ISL then you would also have that command.
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