Re: Address Family Support in OSPFv3

[Sina Mirtorabi <[e-mail]>]

Quaizar

->
->Sina,
->
->I very much agree with Acee here. Optimization at the cost of
->implementation overhead is justified when the optimization
->results in significant performance gains. The gain with AF
->approach is less than O(2), in fact much less in almost all cases.

I do not agree to "much less than O(2)" performance gain and let me get
an example to clarify that

Let's consider the following

- a network participating in IPv6 unicast& multicast and IPv4 unicast &
multicast
- a worse case scenario where there is No overlap between any topologies
- we would consider 1450 byte as the limit for generating new fragments
for router LSA, prefix LSA
- a router have in average 20 adj in each AF (so 80 adj in total as we
considered no overlap)

You could see that even in worse case scenario our proposal compared to
the multiple instance has a

Gain O(4) for each Router LSA
Gain O(4) for each network LSA
Gain O(4) for each prefix LSA
Gain O(4) for each link lsa

You could see that we are far away from "much less than O(2)"

Sina