Per Site QOS policy with Cisco IOS-XE

Tyler Haske tyler.haske at gmail.com
Wed May 8 14:02:07 UTC 2013


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 at 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.
>


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