encapsulation isl
Use the encapsulation isl subinterface configuration command to enable Inter-Switch Link(ISL). ISL is a Cisco protocol for interconnecting multiple switches and routers, and for defining VLAN topologies.
encapsulation isl vlan-identifier
| Syntax | Description |
|---|---|
| vlan-identifier | Virtual LAN identifier. The allowed range is 1 to 1000. |
Default
Disabled
Command Mode
Subinterface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1.
ISL encapsulation is configurable on Fast Ethernet interfaces.
ISL encapsulation adds a 26-byte header to the beginning of the Ethernet frame. The header contains a 10-bit VLAN identifier that conveys VLAN membership identities between switches.
Example
The following ...
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