Ccna routing and Switching Complete Study Guide

switchport mode dynamic desirable

23:12:%LINEPROTO-5-UPDOWN:Line protocol on Interface GigabitEthernet0/14, 

changed state to down

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872

 

Chapter 20 

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  Troubleshooting IP, IPv6, and VLANs

23:12:%LINEPROTO-5-UPDOWN:Line protocol on Interface GigabitEthernet0/14, 

changed state to up

S2(config-if)#

do show int trunk

 

Port        Mode         Encapsulation  Status        Native vlan

Gi0/13      desirable    n-isl          trunking      1

Gi0/14      desirable    n-isl          trunking      1

 

Port        Vlans allowed on trunk

Gi0/13      1-4094

Gi0/14      1-4094

[output cut]

Great, we now have two trunked links between switches. But I’ve got to say, I really 

don’t like the ISL method of frame tagging since it can’t send untagged frames across the 

link. So let’s change our native VLAN from the default of 1 to 392. The number 392 just 

randomly sounded good at the moment. Here’s what I entered on S1:

S1(config-if)#