Overview of ISL Protocol
ISL is a Cisco protocol for interconnecting multiple switches and maintaining information as traffic goes between switches. ISL provides capabilities while maintaining full-wire speed performance on Fast Ethernet links in full- or half-duplex mode. ISL operates in a point-to-point environment and supports up to 1,000 You can define as many logical networks as are necessary for your environment.
This chapter describes how to configure routing between using ISL encapsulation.
Frame Tagging in ISL
With ISL, an Ethernet frame is encapsulated with a header that transports IDs between switches and routers. A 26-byte header that contains a 10-bit ID is prepended to the Ethernet frame.
A VLAN ID is added to the frame only when ...
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