Two contexts sharing the same physical interface

Hi,
I have been looking for a configuration guide on how to set up one physical trunked interface to be shared between two contexts. I am sure I am just using the wrong search words but have as of yet been unable to find anything on this. Anyone able to provide a link please?
Thanks

Hi,
I have not linked (or have the need to) 3 Security Contexts before but I would imagine you could modify the above configuration a bit to achieve that also
interface GigabitEthernet0/0
description TRUNK
interface GigabitEthernet0/0.100
description SC1 - OUTSIDE
vlan 100
interface GigabitEthernet0/0.200
description SC2 - OUTSIDE
vlan 200
interface GigabitEthernet0/0.10
description SC1 - INSIDE
vlan 10
interface GigabitEthernet0/0.20
description SC2 - INSIDE
vlan 20
interface GigabitEthernet0/0.12
description SC1 - TRANSIT
vlan 12
interface GigabitEthernet0/0.21
description SC2 - TRANSIT
vlan 21
context TRANSIT
description SC1 to SC2 TRANSIT SC
allocate-interface GigabitEthernet0/0.12
allocate-interface GigabitEthernet0/0.21
config-url disk0:/TRANSIT.cfg
context SC1
description SC1
allocate-interface GigabitEthernet0/0.100
allocate-interface GigabitEthernet0/0.10
allocate-interface GigabitEthernet0/0.12
config-url disk0:/SC1.cfg
context SC2
description SC2
allocate-interface GigabitEthernet0/0.200
allocate-interface GigabitEthernet0/0.20
allocate-interface GigabitEthernet0/0.21
config-url disk0:/SC2.cfg
I am not sure if this would be the way but that is how I imagined at the moment.
The setup should look something like this
Totally different matter would there be a better way to achieve the same as above
- Jouni

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