How many Interface VLANs on switch I can configure

[ashish7aditya]

Can I configure more than one interface VLAN on a cisco switch? If yes, that means i can assign multiple management IPs to a single switch(with different interface VLANs)?

[Jon Marshall]

A L2 switch you can configure one SVI and this is used for management.

A L3 switch you can configure multiple SVIs but you don't use them all for management ie. most of them are used for end user or server vlans.

Jon

[ashish7aditya]

Hello Marshal,

Many Thanks.. however I have one confusion..

I am @ cisco switch 2950-24 (in packet tracer) and I made following cmds:

Switch(config)#vlan 2

Switch(config-vlan)#exit

Switch(config)#interface vlan 2

Switch(config-if)#ip address 10.1.1.1 255.0.0.0

Switch(config-if)#exit

Switch(config)#vlan 3

Switch(config-vlan)#exit

Switch(config)#interface vlan 3

Switch(config-if)#ip address 172.16.1.1 255.255.0.0

Switch(config)#exit

NOW, when I run # sh ip interface br

I get below VLANs

Vlan1  unassigned   YES                     manual   down         administratively down  

Vlan2 10.1.1.1          YES                     manual up               down

Vlan3 172.16.1.1      YES                     manual up               down

Out of these VLANs, which one is interface VLAN i.e. VLAN#2 or #3 switch will understand ? or both VLAN#2 & VLAN#3 are interface VLANs and both will be active(once there will be traffic on these VLANs).

I was thinking that moment I configured VLAN#3 as interface VLAN, VLAN#2 shouldn't come as interface VLAN anymore.

Further I noticed that if I will ping any of these vlans from PC(PC1:10.1.1.2 connected at access port with VLAN#2 & PC2:172.16.1.3 connected at access port with VLAN#3) then both these VLAN IPs i.e. 10.1.1.1 & 172.16.1.1 were pingable instead of the fact only 172.16.1.1 should be pingable.

Summary: I was thinking that once I configured VLAN#3 as interface VLAN then only this should be the interface VLAN(i.e. one interface VLAN) instead both VLAN#2 & VLAN#3 working as interface VLANs....

Does above means, I have configured two different interface VLANs ?

Where I am going wrong?

Please advice.

Best Regards!

[Jon Marshall · Accepted solution]

It's a bug in PT ie. it allows you to have more than one SVI configured and up but on a real 2950 switch you can only have one SVI up/up at any one time and this is used purely to manage the switch.

Jon

[InayathUlla Sharieff]

Hi ,

As john said this is bug on PT.

Please find below the output from real switch:-

Vlan10                     1.1.1.1         YES manual up                    up  
Vlan20                     2.2.2.2         YES manual down                  down >> it will be in down down state untill i make the vlan 10 as shutdown.

HTH

REgards

Inayath

[ashish7aditya]

Thanks John & Sharieff . :)