On Friday, January 24, 2014 10:59:19 PM Owen DeLong wrote:
I wasn’t attempting to promote or discourage use of MPLS. I was merely endeavoring to point out that in an MPLS world, OSPF costs are not how you want to manage your traffic.
Again, only an issue when using RSVP-TE. I'd recommend MPLS-TE (especially core-to-core, as that is more scalable) when looking at making more aggregate routing decisions when dealing with a bandwidth vs. latency conundrum. Adjusting IGP costs in favour of latency works well, but can have pile-on effects behind or in front of the links being worked on, which can be confusing to troubleshoot when taking other PoP-specific factors into account. It also obliterates any sane cost-assignment mechanism you might have developed (or at best, makes it overly complex). There is room for both options, typically depending on network size, number of links, rate of topology change in your network and skill level of your network engineering team. Mark.