Hi, authors,
Section 1.3.2.2 of RFC6805 describes a new requirement domain diversity in
hierarchy PCE scenario. But the extension draft do not address any detail
about this requirement currently. According to the definition in RFC6805,
domain diversity is referred to as that a pair of paths do not transit any
of the same domain. If this pair of paths only share common ingress and
egress, they are also domain-diverse.
Just from my understanding, maybe this requirement can be resolved by
extending the PCEP object to indicate "domain-diverse" requirement when
PCE computes a pair of dependent path at the same time. When PCC sends
path request to child PCE, this requirement can be indicated in the path
request message, and child PCE can forward this requirement indication to
the parent PCE. Parent PCE has the topology information of domains, so it
is able to compute two domain-diverse paths.
Thanks
Qilei Wang
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