Using SVI Vlan with no ip address

[mahesh18]

       Hi Everyone,

When we will use SVI vlan  in network with  no ip address command?

Say we have switch with

int vlan 50

no ip address

Ports are configured  for vlan 50.

This current switch has no ip address for vlan 50.

So does it mean that some other switch  in network has to have  IP address command configured for that vlan 50?

Regards

Mahesh

[Reza Sharifi · Accepted solution]

Hi Mahesh,

If that that vlan doesn't need to talk to another vlan, then you don't need SVI anywhere.

The vlan will communicate with itself only.

HTH

[juanvladimir · Accepted solution]

i agreed with Resna. No intervlan routing needed no need for SVI layer-3 address.

Sent from Cisco Technical Support iPhone App

[mahesh18]

Hi Reza & Juan,

Say we have ASA  interface  which is assigned to vlan 50--- config

int gi0/0

nameif x

vlan 50

192.168.50.x

We have switch A  which has config---

int vlan 50

no ip address

so does the config of ASA  shows that it has SVI vlan of 50?

Thanks

Mahesh

[ALIAOF_]

So you only one one single VLAN i.e VLAN 50? Can you elaborate what exactly are you trying to accomplish here?  

[mahesh18]

Hi Mohammad,

I was just trying to undertsand the setup here.

Where ASA has interface configured with IP address and vlan 50 and is connected to switch which has svi vlan 50 but no

ip address.

Thanks

Mahesh

[Reza Sharifi · Accepted solution]

Hi Mahesh,

so does the config of ASA  shows that it has SVI vlan of 50?

Correct, in this case the switch is just layer-2 and the ASA is doing the routing.  In this case this is just the physical interface and not SVI.  SVI is used mostly for switches.

Please note: this works fine when you only have one vlan.  If you have more then one vlan then you need to trunk the link that connect the switch to the firewall and create a sub-interfaces on the firewall for each vlan/subnet.

HTH

Reza

[mahesh18]

Hi Reza,

Many thanks again.

Regards

Mahesh