NLB VSP

[EF]

Hi Team,

This is about NLB topology and where (which VSPs) activate NLB on VLAN.

I have cluster of NLB uniscast servers connected to a vIST that acts only as L2, and the L3 of the VLAN is on other vIST of the SPB net.

As the MAC of the clsuter is included in the ARP response and not sure where I have to activate nlb option:

- On VPS L2?

- On VPS L3?

- On both?

- On all VSP of the net where this VLAN is?

Regards

EF

[Ludovico_Steven · Accepted solution]

Only on the L3 VSPs. The NLB mode allows the VSP to install ARP entries which point to either a multicast MAC or a bogus unicast MAC, depending on which NLB mode you use.

The L2 VSPs need no NLB config; they will flood the multicast MAC out of all VLAN ports and will do the same for the NLB bogus unicast MACs which are always unknown as never learnt from any port.