RA preference is very useful in the following very simple situations.
your slide did not cover this, i believe this scenario is the most
popular case.
itojun
a host is on a non-leaf network.
- if we throw RA from router A only, we will lose connectivity to "leaf"
if router A goes down.
- if we throw RA from both router A and B, we have lots of icmp6 redirect
if router B is picked as the default outgoing router for host C.
so what you will want to do is:
- set RA preference as router A > router B, advert from both.
upstream
|
router A
|
==+===============+==
| |
router B host C
|
leaf
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