ISL Trunking
Statically set the trunking encapsulation of SW1’s inter-switch links to ISL.
SW1(config)#int ra fa 0/13 - 21 SW1(config-if-range)#switchport trunk encapsulation isl
Verify that SW2, SW3, & SW4 are negotiating ISL as the trunking encapsulation to SW1, and that SW1 is not negotiating ISL to SW2, SW3,and SW4.
SW1#sh int trunk Port Mode Encapsulation Status Native vlan Fa0/13 desirable isl trunking 1 Fa0/14 desirable isl trunking 1 Fa0/15 desirable isl trunking 1 Fa0/16 desirable isl trunking 1 Fa0/17 desirable isl trunking 1 Fa0/18 desirable isl trunking 1 Fa0/19 desirable isl trunking 1 Fa0/20 desirable isl trunking 1 Fa0/21 desirable isl trunking 1
SW2#sh int trunk Port Mode Encapsulation Status Native vlan Fa0/6 on 802.1q trunking 1 Fa0/13 auto n-isl trunking 1 Fa0/14 auto n-isl trunking 1 Fa0/15 auto n-isl trunking 1 SW3#sh int trunk Port Mode Encapsulation Status Native vlan Fa0/13 auto n-isl trunking 1 Fa0/14 auto n-isl trunking 1 Fa0/15 auto n-isl trunking 1 SW4#sh int trunk Port Mode Encapsulation Status Native vlan Fa0/13 auto n-isl trunking 1 Fa0/14 auto n-isl trunking 1 Fa0/15 auto n-isl trunking 1
Categories: Uncategorized