Wired Intelligent Edge (Campus Switching and Routing)

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Mixed Link Aggregation Groups

Hi community.

I have 02 Aruba 8400 in a VSX deployment (let´s call them SWC01-Primary and SWC02-Secondary)
I also have 01 Aruba 3810M switch (let´s call it SRV-SWITCH) that has an important server connected to it.

Port A1 on SRV-SWITCH is connected to port 1/9/32 on SWC01-Primary

SWC01-Primary has lag 40 multi-chassis with port 1/9/32 assigned to it. This port 1/9/32 has a 10GE-SR transceiver installed and working
SWC02-Secondary has lag 40 multi-chassis with port 1/9/32 assigned to it. This port 1/9/32 has no transceiver installed.
SRV-SWITCH has a "trk1" lacp group with ports A1 and A2 assigned. Only port A1 has a 10GE-SR transceiver installed and working, A2 has no transceiver installed.

Configurations on my switches are the following:

----------------------------------------------------------------------------------------------
SWC01-Primary:

 

SWC01-Primary# sh int transceiver
------------------------------------------------------------
Port Type Product Serial Part
Number Number Number
------------------------------------------------------------
...
1/9/32 SFP+SR J9150D CN93KJW7SD 1990-4635
...
SWC01-Primary# sh running-config
Current configuration:
!
...
interface lag 40 multi-chassis
vsx-sync vlans
description SRV-SWITCH
no shutdown
no routing
vlan trunk native 1
vlan trunk allowed all
lacp mode active
...
interface 1/9/32
no shutdown
lag 40
...

----------------------------------------------------------------------------------------------
SWC02-Secondary:

 

SWC02-Secondary# sh int transceiver
------------------------------------------------------------
Port Type Product Serial Part
Number Number Number
------------------------------------------------------------
...
1/9/32 SFP+SR J9150D CN93KJX1SDK 1990-4635
...
SWC02-Secondary# sh running-config
Current configuration:
!
...
interface lag 40 multi-chassis
vsx-sync vlans
description SRV-SWITCH
no shutdown
no routing
vlan trunk native 1
vlan trunk allowed all
lacp mode active
...
interface 1/9/32
no shutdown
lag 40
...

-----------------------------------------------------------------------------------------------
SRV-SWITCH:

 

SRV-SWITCH# sh running-config

Running configuration:


hostname "SRV-SWITCH"
module 1 type jl074x
module 2 type jl074y
flexible-module A type JL083A
trunk A1-A2 trk1 lacp
ip route 0.0.0.0 0.0.0.0 192.168.100.1
ip routing
...
interface A1
untagged vlan 1
trunk trk1 lacp
exit
interface A2
untagged vlan 1
trunk trk1 lacp
exit
...
SRV-SWITCH> sh int transceiver

Transceiver Technical Information:

Product Serial Part
Port Type Number Number Number
------- ----------- ------------ ------------------ ----------
A1 SFP+SR J9150D CN93KJXJMZ 1990-4635


-----------------------------------------------------------------------------------------------

 

For this deployment I want to release the 10GE-SR transceivers that belongs to both ends of the link between SWC01-Primary and SRV-SWITCH for another use, without disrrupting the server installed on the Aruba 3810 named "SRV-SWITCH".
For this purpose, I want to use a 3m DAC cable (J9283D) and connect it to port A2 in SRV-SWITCH and port 1/9/32 on SWC02-Secondary.
Questions:
In this situation, will the interface "lag 40 multi-chassis" bundle port 1/9/32 on SWC01-Primary and port 1/9/32 on SWC02-Secondary to become a 20 Gbps virtual interface?
In this situation, will the trunk "trk1 lacp" bundle port A1 and A2 on SRV-SWITCH to become a 20 Gbps virtual interface?
Will a link aggregation group conformed by a 10GE-SR fiber optic link and a DAC cable link work correctly?

If this works, this will allow me to create a mixed link aggregation group (10GE-SR link + 10GE DAC cable), then replace the original 10GE-SR link with another 3m DAC cable (J9283D), releasing the 10GE-SR transceivers, all without disrrupting the server operation.

Have anybody deployed this kind of mixed link aggregation group?

 

Tnaks in advance for your support

 


PS: If you feel this information is useful and solved your question or problem, please do not forget to mark it as a solution and give me some kudos.
MVP Expert

Re: Mixed Link Aggregation Groups

It should be OK...one essential requirement for setting up a VSX LAG (or, in general, a LAG) is to use physical interfaces with the same SPEED...so 10Gbps obtained via supported SFP+ Transceivers or obtained via supported DACs should be good enough to let you to have a (VSX/non-VSX) LAG up and connected between your Aruba 8400X VSX nodes and your Aruba 3810M.

Re: Mixed Link Aggregation Groups

This is correct. LACP is working above the MAC layer and only cares on speed and duplex. 

Re: Mixed Link Aggregation Groups

I used such mix media (same speed) a lot in the past, I saw no issue wih that.

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