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Inter-Switch Link (ISL)

Introduction

Inter-Switch Link. Cisco-proprietary protocol that maintains VLAN information as traffic flows between switches and routers.
Configure

Configuration Examples and TechNotes

(All Virtual LANs%2FVLAN Trunking Protocol (VLANs%2FVTP) Configuration Examples and TechNotes)

Configuring FEC and ISL/802.1q Trunking Between a CatOS Switch and External Router

Configuring ISL Trunking Between Catalyst 5000/6000 Switches Running CatOS

Configuring ISL Trunking Between Catalyst Switches Running CatOS and Cisco IOS System Software

Configuring InterVLAN Routing and ISL/802.1Q Trunking on a Catalyst 2900XL/3500XL/2950 Switch Using an External Router

Configuring Layer 2 EtherChannel and Trunking Between 2900XL/3500XL/2950 Series Switches and Catalyst Switches That Run Cisco IOS Software

Configuring Trunking Between a Catalyst 1900 and any Switch Running CatOS Software

Configuring an ISL Trunk Between a Catalyst 2948G-L3 and Catalyst 2900/3500XL or 2970 Series Switches

ISL and 802.1Q Trunking Between Catalyst Layer 2 Fixed Configuration Switches and CatOS Switches Configuration Example

Best Practices for Catalyst 4500/4000, 5500/5000, and 6500/6000 Series Switches Running CatOS Configuration and Management

Catalyst 2948G-L3 Sample Configurations - Full Device Configurations

Comparing Layer 2 Operations in CatOS and Cisco IOS System Software on the Catalyst 6500/6000

Configuring FEC and ISL/802.1q Trunking Between a CatOS Switch and External Router

Configuring ISL Trunking Between Catalyst 5000/6000 Switches Running CatOS

Configuring ISL Trunking Between Catalyst Switches Running CatOS and Cisco IOS System Software

Configuring ISL Trunking on Catalyst 5500/5000 and 6500/6000 Family Switches

Configuring ISL and 802.1q Trunking Between a CatOS Switch and an External Router (InterVLAN Routing)

Configuring InterVLAN Routing and ISL/802.1Q Trunking on a Catalyst 2900XL/3500XL/2950 Switch Using an External Router

Configuring Layer 2 EtherChannel and Trunking Between 2900XL/3500XL/2950 Series Switches and Catalyst Switches That Run Cisco IOS Software

Configuring Trunking Between a Catalyst 1900 and any Switch Running CatOS Software

Configuring an ISL Trunk Between a Catalyst 2948G-L3 and Catalyst 2900/3500XL or 2970 Series Switches

ISL and 802.1Q Trunking Between Catalyst Layer 2 Fixed Configuration Switches and CatOS Switches Configuration Example