L2 vs L3 in user closest off a N7k core

Unanswered Question
Apr 6th, 2010

I have a collapse core/dist to  access and the core will be for both the datacenter and users closets.  Redundant N7k VPC-Cores to active-active VPC N5k/N2k for the DC server farm at L2 while to the  users, I am debating L3 running OSPF to C6k, C4k, 375X. My assumptions are:

diff btwn  ECMP and VPC in terms of the hashing? Are they both stable and which one  is more effective? pros vs cons? Should I go with L2 to Users is  basically what I am unsure of

What hashing should I should I use? I keep  reading to hash on the L4 source-destination port level.

With L3, I want to avoid tweaking the ospf  timers...I will consider tweaking the hello/dead but heard issues with  the SPF and LSA timers...any thoughts?

TIA

I have this problem too.
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