05-14-2012 01:53 PM - edited 03-11-2019 04:06 PM
Hi all,
I am new to ASA cisco 5520 firewall.
I checked config of ASA 5520 it has subinterfaces on gigabit.
Need to know why we create subinterfaces when it has already 4 lan interfaces?
Thanks
MAhesh
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05-14-2012 02:51 PM
Apart from what Kevin said, they are also created if you need the other physical interfaces for some future purpose as well, or if the no. of interfaces that you need is greater than the no. of physical interfaces you have on the ASA.
Thanks,
Varun Rao
Security Team,
Cisco TAC
05-14-2012 05:47 PM
Yes the ASA uses 802.1Q.
Sent from Cisco Technical Support iPhone App
05-14-2012 02:00 PM
Subintefaces can be created for different VLANs that all come in on one physical port. Like 'Router on a Stick'.
Kind Regards,
Kevin
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05-14-2012 02:51 PM
Apart from what Kevin said, they are also created if you need the other physical interfaces for some future purpose as well, or if the no. of interfaces that you need is greater than the no. of physical interfaces you have on the ASA.
Thanks,
Varun Rao
Security Team,
Cisco TAC
05-14-2012 05:44 PM
Hi Varun,
Thanks for reply.
so it means that ASA also use same trunking protocol like 802.1q same like routers and switches?
MAhesh
05-14-2012 05:47 PM
Yes the ASA uses 802.1Q.
Sent from Cisco Technical Support iPhone App
05-14-2012 05:49 PM
Hi Kevin and Varun,
Many thanks for your replies.
As i am new to ASA and i have to work on it now as my new jon so will ask more questions
Regards
MAhesh
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