Alternative to DLDP on wireless connections

[rustyc53]

Hello!

We have two 5130 switches in IRF mode, connecting to another two 5130 switches in IRF mode (in another building).  These switches are using two wireless connections in a smart-link (from each member for resilience), a Unifi UBB and a NanoBeam.

I recently had an issue with these switches in that when I connected a laptop over a different VLAN (ports are trunked and VLAN's are permitted on the ports), DLDP would (somehow) detect a unidirectional connection and would block the port.  Once DLDP was disabled on these interfaces, I can connect via that VLAN.  I don't understand why!?

Anyway, now DLDP is disabled, the smart-link now doesn't work.  If the primary connection on SwitchA goes down, the smart-link correctly displays that the primary is down, and the backup one is active, but on SwitchB the primary is still active (as it can still ping the actual WIFI device).  

Apart from DLDP, is there anything else I can use to automatically down the port?  DLDP worked amazing for this, but for reason I can't use it and have different VLAN's!

[-Alex-]

Hello rustyc53,

You may check BFD and CFD technologies which may help with the link detection.

BFD explanation:

https://techhub.hpe.com/eginfolib/networking/docs/switches/5130ei/5200-3941_l2-lan_cg/content/483580749.htm 

Hope this helps!

[rustyc53]

Hi @-Alex- 

Thanks for the information!

However the ports are not BAGG'ed, the Unifi devices are single ports only, so BFD is not applicable here.  Is there anything else that can be used on non-aggregated ports?

Or could you explain why DLDP is detecting a unidirectional link when a connection over a different VLAN is made (the ports are non-aggregated, and listed as a trunk with two different VLAN's permitted on both switches).

[-Alex-]

Hello  rustyc53,

You may create an agregation with a single link too, there are a lot of ways to set up BFD:

Document - HPE A-Series Switches - How to Configure Bidirectional Forwarding Detection (BFD) Using a Static Route | HPE Support

Also there is a track feature which oyu may use it.

Hope this helps!