What are the possible and efficient ways to load-balance users among multiple PPPoE servers?
I have tried with VRRP. Is there any other efficient way?
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PPPoE it's a L2 protocol, you cannot use a L3 redundancy protocol like VRRP. You can put how many PPPoE server as you want on the same broadcast domain and the redundancy will be guaranteed. The client send the PADI in broadcast, every BRAS reply with PADO but the client will discard all PADO packets except the first one. If your server has some advanced features like PADO delay, use them for have the control of BRAS selection