Hi, and thanks for your response - for LACP I tried both active and passive, to see if either worked, as I wasn't certain which was needed (for the aggregated links on 3810m I've never had to specify and I assume that active is the default and it's ok for both ends to be active). Thanks for the command to aid diagnosis. Currently I'm struggling with the change, though no doubt I'll get used to it eventually! I'm back on site on Sunday - unfortunately this aggregate link is what connects the stack to our WAN infrastructure so I'm unable to work on it remotely.
Original Message:
Sent: Jun 06, 2025 04:46 AM
From: parnassus
Subject: Connecting 3810m to 6200m via aggregate fibre links
Hi, why it was set lacp mode passive (and not simply active) on the lag1's on the Aruba CX 6200M VSF stack side?
AFAIK the VLANs membership look good on both sides (lazy vlan trunk allowed all apart: this could be easily changed into vlan trunk allowed 1,11,40 instead...obtaining the same result).
It's important to match the trk5's VLANs membership on the Aruba 3810M backplane stack side with the corresponding peer lag1's VLANs membership on the Aruba CX 6200M VSF stack side.
On the Aruba 3810M backplane stack do perform a basica check with:
show lacp
show trunk
show vlan ports ethernet trk5 detail
On the Aruba CX 6200M VSF stack do perform a basic check with:
show vlan 1
show vlan 11
show vlan 40
show interface lag 1
show lacp aggregates lag1
Original Message:
Sent: Jun 06, 2025 03:57 AM
From: Unknown User
Subject: Connecting 3810m to 6200m via aggregate fibre links
Hi folks, I'm familiar with the 3810m, but new to the 6200m - the fact that the 6200m is very different in the CLI has come as a nasty surprise, especially because I'm putting together a new site that's time-critical.
We have lots of aggregate links at our various sites that use 3810m stacks, they're really easy. I can't figure out what I'm doing wrong trying to link a 31810m stack to a 6200m stack. In this simplified example I've two VLANs, 11 and 40, that need to traverse the link, and I don't care about the default VLAN.
Can anyone tell me where I've gone wrong or where I should start with a diagnosis? Any assistance very much appreciated!
########## 3810m config ###########trunk 3/A4,4/A4 trk5 lacpvlan 1 name "DEFAULT_VLAN" untagged Trk5 ip address dhcp-bootp exitvlan 11 name "lan" tagged Trk5 ip address 10.240.75.253 255.255.255.0 exitvlan 40 name "structure" tagged Trk5 ip address 10.240.74.253 255.255.255.128 exit########## 6200m config ###########vlan 11 description lan exitvlan 40 description structure exitinterface vlan 11 description lan exitinterface vlan 40 description structure exitinterface lag 1 description datacentre no shutdown vlan trunk native 1 # allow all is lazy, restrict later vlan trunk allowed all #lacp mode active lacp mode passive interface 1/1/51 no shutdown lag 1 interface 2/1/51 no shutdown lag 1 exit