The switch replacement cured the problem. Thanks for the help anyway.
Hi, just installed a new vrtx server and I was trying to aggregate external ports gi0/1 - 8 to the Meraki ports 1 - 8 Initially, until I had all the cabling in, I only had ports 1 and 2 connected in LAG 5. LAG works fine, various Vlans ok and the Meraki is happy. Added the other cables in and expanded the LAG at both ends and I get problems bringing all 8 up. It seems port 5 -8 just do not like being added. If I just concentrate on port 5 alone, that normally just does not add in. I'm down to the command line of the R1-2401 now to see what is happening now. I'm very used to configuring Cisco switches so this is comfortable for me.I have rebooted stuff too. The switch was already running the latest firmware that I could see online. 1.0.0.62 but any suggestions welcome. Good quality cat6a cables are fitted and verfied as have the ports individually. When I was using the gui, I did see 6 of the 8 at one time come up. The first 4 are always good. Config from switch for 1st 5 ports are: interface gigabitethernet0/1 no eee enable no mdix no negotiation channel-group 5 mode auto switchport mode trunk no eee lldp enable!interface gigabitethernet0/2 no eee enable no mdix no negotiation channel-group 5 mode auto switchport mode trunk no eee lldp enable!interface gigabitethernet0/3 no eee enable no mdix no negotiation channel-group 5 mode auto switchport mode trunk no eee lldp enable!interface gigabitethernet0/4 no eee enable no mdix no negotiation channel-group 5 mode auto switchport mode trunk no eee lldp enable!interface gigabitethernet0/5 no eee enable no mdix no negotiation channel-group 5 mode auto switchport mode trunk no eee lldp enable interface Port-channel5 speed 1000 no negotiation description "LAG to External Ports" spanning-tree cost 20000 switchport mode trunk BrnoDellSw1#show lacp port-channel 5Port-Channel Po5 Port Type Gigabit Ethernet Attached Lag id: Actor System Priority:1 MAC Address: f8:b1:56:65:55:f2 Admin Key: 1004 Oper Key: 1004 Partner System Priority:32768 MAC Address: 00:18:0a:ca:83:e1 Oper Key: 768 #show int port-channel 5 Load balancing: src-dst-mac. Gathering information...Channel Ports------- -----Po5 Active: gi0/1-4 Non-candidate: gi0/5 #show lacp gi0/1gi0/1 LACP parameters: Actor system priority: 1 system mac addr: f8:b1:56:65:55:f2 port Admin key: 1004 port Oper key: 1004 port Oper number: 1 port Admin priority: 1 port Oper priority: 1 port Admin timeout: LONG port Oper timeout: LONG LACP Activity: ACTIVE Aggregation: AGGREGATABLE synchronization: TRUE collecting: TRUE distributing: TRUE expired: FALSE Partner system priority: 32768 system mac addr: 00:18:0a:ca:83:e1 port Admin key: 0 port Oper key: 768 port Oper number: 1 port Admin priority: 0 port Oper priority: 32768 port Oper timeout: LONG LACP Activity: ACTIVE Aggregation: AGGREGATABLE synchronization: TRUE collecting: TRUE distributing: TRUE expired: FALSEgi0/1 LACP statistics: LACP Pdus sent: 170 LACP Pdus received: 170gi0/1 LACP Protocol State: LACP State Machines: Receive FSM: Current State Mux FSM: Collecting Distributing State Periodic Tx FSM: Slow Periodic State Control Variables: BEGIN: FALSE LACP_Enabled: TRUE Ready_N: FALSE Selected: SELECTED Port_moved: FALSE NNT: FALSE Port_enabled: TRUE Timer counters: periodic tx timer: 26 current while timer: 79 wait while timer: 0BrnoDellSw1# 1#show lacp gi0/5gi0/5 LACP parameters: Actor system priority: 1 system mac addr: f8:b1:56:65:55:f2 port Admin key: 1004 port Oper key: 1004 port Oper number: 5 port Admin priority: 1 port Oper priority: 1 port Admin timeout: LONG port Oper timeout: LONG LACP Activity: ACTIVE Aggregation: AGGREGATABLE synchronization: FALSE collecting: FALSE distributing: FALSE expired: FALSE Partner system priority: 0 system mac addr: 00:00:00:00:00:00 port Admin key: 0 port Oper key: 0 port Oper number: 0 port Admin priority: 0 port Oper priority: 0 port Oper timeout: LONG LACP Activity: PASSIVE Aggregation: AGGREGATABLE synchronization: FALSE collecting: FALSE distributing: FALSE expired: FALSEgi0/5 LACP statistics: LACP Pdus sent: 0 LACP Pdus received: 0gi0/5 LACP Protocol State: LACP State Machines: Receive FSM: Port Disabled State Mux FSM: Detached State Periodic Tx FSM: No Periodic State Control Variables: BEGIN: FALSE LACP_Enabled: TRUE Ready_N: FALSE Selected: UNSELECTED Port_moved: FALSE NNT: FALSE Port_enabled: FALSE Timer counters: periodic tx timer: 0 current while timer: 0 wait while timer: 0  Anybody any ideas or want more info? It just totally struggles after port 4 to add anything in. I haven't ruled out a hardware fault on the switch module as it is new. Don't have anything else to compare with at the moment. On the Meraki all ports are set the same to trunk etc. Port 5 just stays brown not green and when you hover over  it you get the message "Port running LACP and LACP has disabled this port" Thanks for anything, Dave   
VRTX Switch R1-2401 aggregate links to Merkai MS320-48 switch