I will be spending a few hours (or couple of days) with 2 DSL MODEMS connected to a switch (2924). With 2 modems connected to the same BRAS/BAS router (Bell Canada uses Juniper ERX).
With the first modem handling an established PPPoE session, the switch will initially only find 1 path to the ethernet address of the remote BAS router.
But, when that PPPoE session is restarted, the PPPoE negotiations, happening as ethernet broadcasts, will be send to both modems, and the BAS may respond to both requests, at which point, the swicth would find that both ports 1 and 2 can reach the ethernet address of the BAS.
Considering that the BAS probably doesn't handle spanning tree, how will the switch behave ?
Will it just send any/all packets destined to the BAS ethernet address on both ports ? (causing the BAS to receive 2 copies of each packet)
Or will it choose just one port for all traffic destined to that ethernet address ?
Are there IOS commands to tell the switch how to handle such a situation ?