Appendix B. SWITCH Exam Updates: Version 1.1
Note
Coverage of this topic should be integrated into your study of Chapter 11, “Multilayer Switching,” right before the section “Multilayer Switching with CEF.”
Controlling the Automatic State of an SVI
Because a Layer 3 SVI is bound to a Layer 2 VLAN on a switch, it normally follows the state of the VLAN on that switch automatically. If the switch has at least one Layer 2 interface that is up and active on the VLAN, the Layer 3 SVI will be brought up, too. If all the Layer 2 interfaces assigned to the VLAN are down, the Layer 3 interface will be brought down.
This is the default “autostate” behavior. The idea is to bring the Layer 3 interface down so that routing protocols will cease advertising ...
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