I assume you're using MikroTik. You can run multiple PPPoE servers on a single Ethernet segment. The client will send its PPPoE Active Discovery Initiation (PADI) packet, and both servers will reply with their PPPoE Active Discovery Offer (PADO). The client will then select which AC it wants to use based off of which AC replied first, AC name, service name, or any combination thereof.
http://wiki.mikrotik.com/wiki/Manual:Interface/PPPoE#Stages http://en.wikipedia.org/wiki/Point-to-Point_Protocol_over_Ethernet#Server_to_client:_Offer_.28PADO.29 Posting on Cisco mailing list regarding PPPoE AC redundancy. http://puck.nether.net/pipermail/cisco-bba/2005-April/000477.html Juniper's PPPoE AC implementation has a 'delay' feature in its 'Service Name Tables' which allow an administrator to explicitly set an AC as backup. http://www.juniper.net/techpubs/en_US/junos10.1/information-products/topic-collections/config-guide-network-interfaces/topic-40403.html#jd0e116783 Because MikroTik doesn't support this 'delay' you'd really end up just load balancing your clients across the two AC's. Not a bad solution and it still provides some level of redundancy. -- Blake Covarrubias On Nov 2, 2010, at 11:36 PM, Scott Vander Dussen wrote: > Cross posting from another list for different opinions.. > > We're looking to have more than one PPPoE Concentrator available so that if > one goes down due to catastrophic failure, the customers associated to that > concentrator will rollover to the next one. However, the concern is that > because the initial connection is layer 2 that both concentrators may see the > same connection attempt and authenticate both. Is there a real effective way > of having two concentrators that either load balance or provide redundancy? > > Thanks, > `S > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
