If you want to prevent a PE router from deciding which ingress packets to drop, the only plan is to send packets to spoke sites at or below the spoke line-rate. The only good way to do that is shaping on the hub router. policy-map parent_shaper class class-default shape average 100000000 < --- 100Mbps parent shaper. service-policy site_shaper policy-map site_shaper class t1_site shape average 1536000 service-policy qos_global class multilink_site shape average 3072000 service-policy qos_global class class-default service-policy qos_global policy-map qos_global ... whatever you typically use here.... Tyler Haske On Wed, May 1, 2013 at 5:03 PM, Wes Tribble <westribble@gmail.com> wrote:
I have a question for the QOS gurus out there.
We are having some problems with packet loss for our smaller MPLS locations. This packet loss is due to the large speed differential on our Hub site(150mb/s) in comparison the the branch office locations(single T-1 to 4.5mb/s multilinks). This packet loss only seems to impact really bursty applications like our Web Proxy. I have been around and around with WindStream to give me some extra buffer or enable random early detection on the smaller interfaces in my MPLS network. So far they are unwilling to do a custom policy and none of their standard policies have enough buffer to handle the bursts. They do FIFO tail drop in every queue, so I can’t even choose a policy that has WRED implemented.