> > > Once that’s done, the ABR can safely withdraw the UPA, and the network > remains stable (i.e. from R1 perspective the backup egress router became > the new primary egress router once BGP converged because session with R2 > failed). > [WAJ] Then, R1 will keep using the backup egress router forever? When, how > and what trigger the R1 switchback to the original egress router? > > Even without UPA at all in the picture if operators chooses active/backup scheme (as opposed to active/active model) for multihomed sites or networks typically BGP paths carry properly set LOCAL_PREF attribute.
UPA does not have anything to do with it. Thx, R.
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