On 20 October 2011 16:02, Phil Mayers <[email protected]> wrote: > On 10/20/2011 08:28 PM, Sebastian Wiesinger wrote: >> >> One problem with active/standby is mac aging on the CE switch(es). >> When the primary PE goes down, the backup PE takes over and the >> CE-switches learn mac addresses on the link towards the backup PE. >> Now when the primary link comes online again, the VPLS on the primary >> PE goes active, forcing the standby PE to deactivate VPLS. The CE >> switches still have the mac addresses learned on the port to the >> standby PE so you have to wait until the mac addresses age out (or a >> packet with that source mac comes in from the primary PE). > > I can think of a few ways vendors could solve this. Most simply, the backup > PE could briefly down the link, to trigger an FDB flush. Hell, you could > probably script this using EEM in cisco-land.
That's assuming the LER which terminates the VPLS connects directly to the customer, and there are no L2 agg switches between the cust and the LER. I wondered about the idea of the new master PE sending gratuitous ARPs towards the CE for any MACs in a given VPLS's FDB, but depending on the network, that could be quite a load of MACs I guess. David _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
