QOS with Traffic Shaping - what happens when bandwidth is full ???

[cbreslin99]

Below is my router config. I suspect my prioritised traffic is not being prioritised. Possibly the traffic shaping policy deals with all traffic as equal and does not take into account the policy " My_QoS_Policy " ????

Any packet matching dscp value 4 is labelled Telepresence
Any packet matching access list Telepresence is labelled Telepresence
Any packet matching dscp value 3 is labelled Call-Signaling
Any packet matching dscp value 6 is labelled Routing
Any packet matching access list voice is labelled voice

Router config :

ip access-list extended Telepresence
permit ip host 10.34.81.176 any
ip access-list extended voice
deny ip host 10.34.81.176 any
permit udp 10.34.81.0 0.0.0.255 any range 16384 32768

class-map match-any Telepresence
match dscp cs4
match access-group name Telepresence
class-map match-all Call-Signaling
match dscp cs3
class-map match-all Routing
match dscp cs6
class-map match-all voice
match access-group name voice
!
policy-map My_QoS_Policy
class voice
set ip precedence 5
priority 4000
class Routing
bandwidth 256
class Call-Signaling
bandwidth 256
class Telepresence
bandwidth 6000
queue-limit 128 packets
set dscp cs4
class class-default
set ip precedence 0

policy-map Internal_Outbound
class class-default
shape average 30000000
service-policy My_QoS_Policy

interface GigabitEthernet0/0
description ### MPLS Circuit - 30Mbit/s ###
bandwidth 30000
ip address 172.x.x.x 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip accounting output-packets
load-interval 30
duplex full
speed 100
service-policy output Internal_Outbound

[mlund]

When the traffic is exceeding 30M the policy My_QoS_Policy will kick in, so in that part it all seems OK.

However some products does not take the L2 headers into account, wich can lead to a slightly higher traffic than 30M, and the possibility that the provider starts to drop traffic. If this is the case maybe decreasing the shaper to 29M will help.

And that leads us into the ISP part, what does ISP do with classified traffic, do they have QoS configured in the way that is good for You? Ask them.

/Mikael

[cbreslin99]

mlund thanks for your reply.

You've answered my question that the policy My_QoS_Policy does kick in after 30 meg bandwidth is used - so thanks for that and the extra detail.

We do have an agreement with our ISP with regards voice and video traffic