Configure ISL trunking between Catalyst switches that run CatOS and Cisco IOS (native mode)

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Resolution

To enable the Inter-Switch Link (ISL) trunking on a Catalyst OS (CatOS) and integrated Cisco IOS  Software (native mode) switch, issue these commands:

• In the CatOS switch:    

  cat5000>set trunk mod_num/port_num [on|desirable|auto|nonegotiate] isl

         
• In the integatred Cisco IOS (native mode) switch:    

  cat6500(config-if)#switchport trunk encapsulation {isl|dot1q|negotiate}

     

For more information on implementing ISL trunking between Catalyst switches running CatOS and integrated Cisco IOS (native mode), refer to Configuring ISL Trunking Between Catalyst Switches Running CatOS and Integrated Cisco IOS (Native Mode).

For information on implementing ISL trunking between Catalyst 5000 and Catalyst 6000, refer to Configuring ISL Trunking on Catalyst 5000 and 6000 Family Switches.