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Cannot configure dot1Q encapsulation on a trunk port in the WS-X6148-GE-TX module
The encapsulation option does not show up when trunking is configured on a trunk port in the WS-X6148-GE-TX module. This is because the encapsulation option is enabled by default.
Two trunking encapsulations are available on all Ethernet ports:
Inter-Switch Link (ISL) is a Cisco-proprietary trunking encapsulation.
Note: The WS-X6148-GE-TX switching module does not support ISL encapsulation.
802.1Q (or dot1Q) is an industry-standard trunking encapsulation.
A trunk can be configured on a single Ethernet port or on an EtherChannel.
The trunking mode, the trunk encapsulation type, and the hardware capabilities of the two connected LAN ports determine whether a link becomes an ISL or 802.1Q trunk.
Ethernet trunk ports support several trunking modes. As the WS-X6148-GE-TX switching module does not support ISL encapsulation, the 802.1Q encapsulation is configured by default. So the dot1Q encapsulation is not available when trunking is configured on a trunk port in the WS-X6148-GE-TX module.
To display the administrative and operational status of a switching (nonrouting) port, issue the show interfaces switchport command.