03-20-2013 03:16 AM - edited 03-07-2019 12:22 PM
Hello,
I have a problem with the configuration of my Cisco ASA 5505. I have 2 interfaces 0/2 and 0/3 which are each connected to a switch SW1 and SW2.
On these interfaces I have a trunk multiple VLANs. When I plug the interface 0/2 on the SW1 no problem. But when I add the interface 0/3 on SW2, I have a loop that is.
I made a shema to understand.
the 5505 does not support the spanning tree, the spanning tree is configured on two switches.
Is there a solution to activat the interface 0/3 when 0/2 is down ?
Config of ASA (0/3 is shutdown to avoid the loop) :
interface Ethernet0 / 2
switchport trunk allowed vlan 2-4
switchport mode trunk
!
interface Ethernet0 / 3
switchport trunk allowed vlan 2-4
switchport mode trunk
shutdown
!
03-20-2013 04:02 AM
Hi,
you can use the redundant interface feature:
http://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/intrface.html#wp1045838
Regards
Alain
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03-20-2013 04:15 AM
thank you, I'll watch.
I found this command that also seems to solve my problem:
switchport protected (on both interfaces)
Not familiar with the operation of this command. I'll try your method which is more understandable.
03-20-2013 04:29 AM
Hi,
switchport protected will prevent interfaces with this feature to communicate, this is also called pvlan edge feature but it will not prevent STP loops to my best knowledge.
Regards
Alain
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03-20-2013 04:29 AM
unfortunately I do not have controls available ...
FW-B1#
FW-B1# conf t
FW-B1(config)# int ?
configure mode commands/options:
Ethernet IEEE 802.3
Vlan Catalyst Vlans
FW-B1(config)# int
03-20-2013 05:03 AM
Hi,
you can also try this on the switch side:
http://www.the-lan-man.net/wordpress/2010/asa-5505-switch-redundancy/
Regards
Alain
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03-20-2013 07:27 AM
thank you for your help Alain,
unfortunately i don't have a 3750 stack behind but I have only 2 DELL 3524 without stack.
there is just a port-channel between swtichs.
I'll keep looking, but my case seems to have no solution
thank you again
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