Re: WGLC for draft-rtgwg-mrt-frr-architecture

[Stewart Bryant <[e-mail]>]

Another couple of comments on this draft.

The technique you use of selecting a single node and forming
two trees rooted at that node should really be noted up front
in the summary.

A consequence of this is that when you add a node or
when the root node fails the trees and hence the
FRR paths may change. To some extent this happens
in LFA and RLFA, although the changes will tend to
be confined to a local region, whereas with MTR I
think that the  node may move to a completely
different region. If that is the case then that has an
impact on the FRR traffic management. By way of
comparison, NV is the least impacted by this approach
and the SR approach is impacted as much as LFA, but
has the option of correcting this will a little effort.

I think that there really needs to be some text on the
matter in the architecture spec.

- Stewart