On 2008-01-25 05:08, Brian Dickson wrote: > Brian E Carpenter wrote: >> >> Another point is that a normal scenario for a dual homed site wishing >> to change one of its ISPs would be to triple-home for a while (i.e. >> add ISP C while retaining ISPs A and B) and then drop A or B once things >> are stable with C. So changing from 2 to 3 and then back to 2 should >> be a simple operation, not two changes of mode. >> > By changes of mode, presumably you mean multi-homed -> single-homed -> > multi-homed? > > I don't think that would be strictly necessary. > > Each EID prefix is constructed based on a pair of upstreams. > > However, there could be multiple EID prefixes, announced with different > preferences on them. > > They would be ABab, ACac, and BCbc. Sort them however you want, change > them as C gets ironed out. > > And eventually disconnect A or B, and magically the EIDs with A or B in > them go away. > > Obviously, in this scheme, removing an uplink could break existing > connections, but I doubt that's a show-stopper.
Frankly this is beginning to make shim6 look simple and straightforward... Brian -- to unsubscribe send a message to [EMAIL PROTECTED] with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg
