[j-nsp] LDP VPLS - Multi-homing

[Aaron Gould]

(I really should change this subject heading to "BGP VPLS - Multi-homing"
since that's the more specific vpls version we are discussing at this
point... FEC 128 / RFC 4761)

hey look what I just found ..
https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/vp
ns-configuring-vpls-multihoming.html
"When two PE routers use the same site ID, VPLS assumes multihoming behavior
by default."  .so I guess that's why I'm seeing good multi-homing behavior
without configuring that command ".site multi-homing"

But interestingly, they mention a few things with that multi-homing command.
they say it tracks bgp neighborship, but I don't know what they mean by
this. "such as to prevent isolation of the PE router from the core or split
brain."  Not sure how that *prevents* isolation.  If you lose bgp, aren't
you isolated ?!

Also, I'm wondering what the scenario is that they mention in this statement
. "There are scenarios, however that require preventing of BGP peer
tracking, such as in a two-PE-router topology. In such cases, multihoming
should not be explicitly configured as it can break node redundancy."  How
would config'ing "protocol vpls site test multi-homing" break node
redundancy ?

- Aaron Gould