singh.andy wrote:
Hi All- I'm trying to figure out which setup would provide more even load balancing across multiple links. Let's say i have a core and distribution switch connecting via multiple links and run OSPF between them. Would it be better to create an Etherchannel and run OSPF on this aggregated link or configure individual L3 links and let OSPF load balance across. Any PRO or Cons with either aside from wasting few extra /30s for l3 links
Depends on whether you are talking about L2 or L3 etherchannel. If L2 personally i would go with routed links because this keeps STP out of the core which i believe is a good thing to do. If you needed to span vlans across the core then obviously thay wouldn't work but you should be able to avoid.
If L3 etherchannel not so clear cut. Etherchannel always uses the same link for the same src/dst pair which can lead to very uneven use of the links. I don't believe that per-destination load-balancing shares the same restriction. So a lot depends on your traffic distribution.
Jon
