I have what may seem like a basic question. We have built some policers to apply to vlan SVIs on our 7613 so that we can rate limit input and output traffic. We followed the Cisco formula and got this.
policy-map vlan-shape-3meg
class class-default
police cir 3000000 bc 562500 be 1125000 conform-action transmit exceed-action drop violate-action drop
There have been some complaints about this not actually meeting the limit. When I do a show policy-map interface xxx I get this. Based on that it looks like the Be value is being change to match the Bc value.
On a separate note, I noticed that every policer we built with the cisco formula actually ends up with a Tc greater than the max Tc of .125 seconds. It seems odd that a recommended formula would end up creating values outside the maximum allowed limits by the software.
I'm not a QoS expert so if any of this seems like basic stuff it's just because I'm a little slow on QoS.
Vlan2
Service-policy input: temp-remove
class-map: class-default (match-any)
Match: any
police :
3000000 bps 562000 limit 562000 extended limit
Earl in slot 5 :
0 bytes
5 minute offered rate 0 bps
aggregate-forwarded 0 bytes action: transmit
exceeded 0 bytes action: drop
aggregate-forward 0 bps exceed 0 bps
Service-policy output: temp-remove
class-map: class-default (match-any)
Match: any
police :
3000000 bps 562000 limit 562000 extended limit
Earl in slot 5 :
940 bytes
5 minute offered rate 0 bps
aggregate-forwarded 940 bytes action: transmit
exceeded 0 bytes action: drop
aggregate-forward 0 bps exceed 0 bps
One other thing...in order to apply policers input and output on an SVI does mls qos vlan-based have to be configured on the trunks tagged with the corresponding Vlan?
Thanks for any offered explanations. I have to figure this out but my curiousity has been peaked by this.
