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Vlans & Interfaces

louis0001
Level 3
Level 3

I see a lot of switches configures with vlans & interfaces without IP addresses eg vlan 500 & int vlan 500

Now it may be a silly question (as I've never thought to ask it) but is there any need to have these interfaces on there rather than just have the vlan by itself?

Does having an unassigned interface waste resources or offer less security?

5 Replies 5

Hello,

 

each VLAN interface (SVI) uses an IDB (Interface Descriptor Block), and each IDB uses memory. How many do you have ? I can imagine someone putting them in the config to quickly see which VLANs are present.