topic Context Group and subinterfaces in Network Security

Context Group and subinterfaces

mahesh18 — Tue, 12 Mar 2019 01:38:15 GMT

Hi Everyone,

ASA have two context groups say admin and and x.

Its interface gi0/2 has 6 subinterfaces from 1 to 6.

3 subinterfaces ----0/2.1 to 3 are in admin and last 3 are in context x.

when i went to system context it does not show where interface gi0/2 belongs to it only shows up up.

how can i find which context group physical interface gi0/2 belongs?

Thanks

Mahesh

Context Group and subinterfaces

Jouni Forss — Fri, 03 May 2013 17:51:40 GMT

Hi Mahesh,

As you said, the interface GigabitEthernet0/2 is divided into subinterfaces. This means its a Trunk interface. The ASA has a Trunk with some other device connected to it.

So the physical interface (Trunk) itself doesnt belong to any context. Its subinterfaces however belong to the contexts as you mentioned.

- Jouni

Context Group and subinterfaces

mahesh18 — Fri, 03 May 2013 18:16:17 GMT

Hi Jouni,

Is there any way i can check in running config that will show its trunk interface?

thanks

Mahesh

Re: Context Group and subinterfaces

Jouni Forss — Fri, 03 May 2013 18:21:51 GMT

Hi,

If a physical interface has subinterfaces then its considered a Trunk interface

For example

interface GigabitEthernet0/1

interface GigabitEthernet0/1.100

description LAN

vlan 100

I guess in the System Contex you should see same type of configurations for the GigabitEthernet0/2 interface and subinterface configurations?

- Jouni

Context Group and subinterfaces

mahesh18 — Fri, 03 May 2013 18:23:45 GMT

Hi Jouni,

Many thanks again i got it now.

Mahesh