Fabric attach - SMLT with LACP

[tfsnetman]

Hello,

I am trying to connect a x460G2 stack to a VSP7400 cluster using this configuration with no luck.

While both links are up on both sides communication is not happening.

x460G2

enable sharing 1:49 grouping 1:49,2:29 algorithm address-based L2 lacp

VSP7400 config is identical on both cluster members

mlt 3 enable
mlt 3 member 1/3
mlt 3 encapsulation dot1q

interface mlt 3
smlt
fa
fa enable
no fa message-authentication
exit

lacp smlt-sys-id 20:9e:f7:8f:6c:03
lacp enable

interface GigabitEthernet 1/3
default-vlan-id 0
no shutdown
lacp key 3 aggregation enable timeout-time short
no spanning-tree mstp  force-port-state enable
exit

What am I missing?

Thank you,

Klaus

[StephanH]

Hello Klaus,

glad if we could help. Thank you for your feedback.

[Miguel-Angel_RO]

[tfsnetman]

Hi Stephan, Mig,

Thank you again for sharing your knowledge.

Just confirming that today it saved my back when the link didn’t come up due to a key mismatch.

Klaus

[Miguel-Angel_RO]

Hi Klaus,

On top of the advantages mentioned by Stephan I would like to add another one that can make the difference.

If you configure ports 1 & 2 with lacp key 201 and port 3 & 4 with lacp key 203 you protect yourself from wrong patching.

If by mistake you mix the patches from port 1,2 and 3,4, the LACP cannot come up  on the faulty cable because the keys will not match on cables coming from different LACP links.

It is like playing with the ethertype (or other parameters) when configuring VLACP.

Mig