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can't create subinterface from Cisco5510

j10151983
Beginner
Beginner
Hi Guys, need your help. I have a newly purchased Cisco5510 and I am configuring it as usual from the other high end ASA. But from this ASA, I cannot create a subinterface and cannot configure nameif from the main interface. Is it really a behaviour of Cisco5510? Another problem I have is, I have downgraded the IOS from Version 9.0 to 8.25 as per our company standard. I was able to load the ios and boot to this IOS, however upon checking, the software version is still 9.0.
6 Replies 6

Jouni Forss
Mentor
Mentor

Hi,

 

If you are configuring sub interfaces on the ASA they should be configured in the following way

 

interface Ethernet0/0.100
 vlan 100
 nameif <name>
 security-level <level>
 ip address <ip> <mask>

 

Are you sure that you have configured the "vlan" under the sub interface before you try to configure "nameif" or any other parameters? I wonder if having the firewall in Transparent mode would affect this also? Or is the firewall in its default Routed mode?

 

Also with regards to your software level problem. I would presume that the problem is that you have not removed the higher level software from the boot settings

 

Try the command

 

show run boot

 

If you can see the file for the software 9.0 mentioned then remove it. It might be first on the list and then after that the 8.2 and because of that the new software might still be booting up.

 

Hope this helps :)

 

- Jouni

Firewall didn't accept "interface eth0/0.100" or any other subinterface, same thing when I go to main interface and try doing nameif, no available syntax for that. With regards to IOS, yes I removed the previous IOS, from the show bootvar, it shows 8.2 image only. Actually, when I reload the firewall, it shows it is loading from 8.2 image. I will share the result once back to office.

The interface that you want to create sub interfaces should look like this

 

int eth0/0

 no nameif

 security-level XX <-- what ever level you want here

 no ip address

 

now add the sub-interfaces

interface Ethernet0/0.100
 description Interface to ???
 vlan 100
 nameif XXX <-- what you want to name it
 security-level XX <-- what ever security level you want
 ip address <ipaddress> <Mask>

 no shut

 

hope this helps

 

mike

Sorry it does not HAVE to be that.... I was just seeing if that worked for you.

Can you post the config for that port?

 

Also check to make sure the main port is not shutdown

 

Mike

 

ASA Version 9.0(3)
!
hostname BUFW7001
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface Ethernet0/0
 switchport access vlan 522
 speed 100
 duplex full
!
interface Ethernet0/1
 switchport access vlan 523
 speed 100
 duplex full
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/6
!
interface Ethernet0/7
!
interface Vlan522
 nameif Inside_Int
 security-level 100
 ip address 10.204.51.57 255.255.255.248
!
interface Vlan523
 nameif Outside_Int
 security-level 0
 ip address 10.209.47.1 255.255.255.252
!
boot system disk0:/asa825-k8.bin
ftp mode passive
 

Hi,

 

You wont be able to create subinterfaces on the ASA5505 model as its a firewall with a built in switch module. Therefore it acts like a L3 switch and you configure Vlan interfaces instead of subinterfaces of actual physical ports. Seems there was some missunderstanding related to the ASA model. ASA5505 has switch ports and you can configure Trunk interfaces with the proper license (Security Plus).  No other basic ASA model (other than the FWSM and ASASM) support Vlan interface to my understanding.

 

Depending if the ASA is using Base License or Security Plus license your allowed Vlan interface limit may vary. On the Base License its 3 vlans (of which one is resricted) and on Security Plus I think the limitation was 20 Vlans.

 

Hope this helps :)

 

- Jouni

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