Possibility of an IP in a physical interface and a subinterface ip in the same interface?

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Possibility of an IP in a physical interface and a subinterface ip in the same interface?

L2 Linker

Hi all,

I need to reassure me on a simple configuration.

Is it possible to do this configuration?

IP interface 1: a.a.a.a / x
IP interface 1.10: a.a.10.a / x
IP interface 1.20: a.a.20.a / x


I ask this because I've seen a few configurations and whenever subinterfaces were used, there was no IP on the physical interface.


Thank you in advance for your return.Smiley Wink

2 REPLIES 2

L5 Sessionator

Hello, will the three example addresses you have specified need to be within the same subnet or three unique subnets?

It is not possible to have multiple layer 3 interfaces belonging to the same subnet within a single virtual router.

I was able to commit the following configuration example on a PA-200 without issue.

subinterfaces.PNG

(disclaimer: I have not tested passing traffic with a corresponding trunked switch port connected to physical interface ethernet1/4)

Thank you for your help.

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