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I follow a tutorial, there shows the method of create sub-interface:

but in my actual situation, I can not do this:

Router(config)#interface gigabitEthernet 2/1.100
                                           ^
% Invalid input detected at '^' marker.

my router is CGR 1240 in Cisco Packet Tracer.

244boy
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1 Answers1

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The CGR 1240 does not appear to support 802.1q VLAN's, based on the Cisco Data Sheet for the router:

https://www.cisco.com/c/en/us/products/collateral/routers/1000-series-connected-grid-routers/datasheet_c78-696278.html

Davidw
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