Dell S3048 basic LACP configuration problem

Question

Hello,   I actually have a custer of firewall connected on a cluster of H3C switches. Primary firewall connected on of the 1st H3C switch, and backup firewall connected on the 2nd H3C switch. Both in a stack. I have to move this firewall on our S3048-ON Dell switches. We have two of them, configured with VLT domain. The problem is my configuration on our Dell switches is not working. When i move the firewalls on Dell switches, it's not working anymore. And I don't know why. I must miss something because it's a basic LACP configuration and on other devices it's working this way without any trouble. Can someone help me? In my understanding, the LACP configuration on Dell switches is ok...   Here is the configuration on this H3C related to the firewall. interface Bridge-Aggregation12 description FIREWALL port access vlan 31 link-aggregation mode dynamic stp root-protection# interface GigabitEthernet1/0/31 description FIREWALL port access vlan 31 stp root-protection port link-aggregation group 12# interface GigabitEthernet2/0/31 description FIREWALL port access vlan 31 stp edged-port enable port link-aggregation group 12#   Here is the configuration on our DELL switches: interface GigabitEthernet 1/48 description FIREWALL no ip address! port-channel-protocol LACP  port-channel 4 mode active no shutdown! interface Port-channel 4 description FIREWALL no ip address portmode hybrid switchport no spanning-tree pvst err-dis cause invalid-pvst-bpdu vlt-peer-lag port-channel 4 no shutdown! interface Vlan 31 ip address xxxx/x untagged Port-channel 4,10 no shutdown!

mmmartinm · Answer

Hello Daniel and thank you for your help.

For the test, i just de-plugged it from H3C to plug it on Dell switches. Unfortunatly as this is a critical device, i do not had a big window to operate so i could not really troubleshoot, i plugged it back on H3C.

I don't think this is a VLAN configuration problem as we have other devices using this VLAN on our Dell switches, they works perfectly. I think it's really a LACP problem but i don't know why for now.

I'll find a biffer window to operate and follow the kb you linked in your post. I'll come back with a solution or other questions :)

mmmartinm · Answer

The weird thing is that i use the exact same configuration for other LACP devices !

Here is an other LACP port configured for a stack of HP switches:

interface TenGigabitEthernet 1/49
no ip address
!
port-channel-protocol LACP
port-channel 3 mode active
no shutdown
!
interface Port-channel 3
no ip address
portmode hybrid
switchport
no spanning-tree pvst err-dis cause invalid-pvst-bpdu
vlt-peer-lag port-channel 3
no shutdown
!

mmmartinm · Answer

I just have to shutdown our H3C switches because they are too old.

As this is the same vlan and same network configured on H3C switches and on DELL switches, the firewall configuration is out of the equation.

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