As per our network monitoring device, One of the Catalyst 6807 in the network have 2 vlans assigned to SVI interface . I am not sure if this is misconfiguration . I wanted to know if this is possible to assign multiple vlans to an SVI .

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    Hello and welcome to Network Engineering. Please post the configuration you are referring to. – Cown Oct 8 at 16:50

No, this doesn't make sense. An SVI is the virtual interface entity in a VLAN. If you want interfaces in two different VLANs you need to create two SVIs.

I think you've confused VRFs and SVIs. VRFs can handle the routing for multiple SVIs, segregating the traffic from some VLANs from others.

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Every SVI is just an IP address in a Layer 3 VLAN, so, you can have more than one IP on an SVI, but each SVI is in its own VLAN.

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Think of it like this: each VLAN can get a virtual interface it is applied to, which can be assigned IP address(es) and Net Mask(s).

It would be like assigning an IP address to a given physical port, but instead it's to a virtual port, you can't put that port into two VLANs without it being a trunk, and a trunk port can't have an IP address assigned to it.

So each Layer 3 VLAN is basically a virtual Access-port assigned to the given access VLAN, assigned a given IP address.

The syntax even lends itself to this interpretation:

int vlan 300
 description SVI_VAN_300
 ip address 10.10.10.1 255.255.255.0
 ip address 10.10.10.254 255.255.255.0 secondary

Very similar to the traditional port:

int e1/48/2
  description routed port on vlan 300
  switchport mode access
  switchport access vlan 300
  ip address 10.10.10.1 255.255.255.0
  ip address 10.10.10.254 255.255.255.0 secondary

You can't set a VLAN interface into access mode or assign it to a VLAN because that's inherent.

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