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cisco QoS and shaping policy question

cisco QoS and shaping policy question

cisco QoS and shaping policy question

In my network i've got an internet connection totaling 50Mbps for site to site across a dedicated line. i'm using traffic shaping to control congestion. right now we see that my servers policy, which is meant to reserve a certain bandwidth for server traffic under congestion is using this shape average at all times. I think this is normal, but i'm wondering if there is a way that I can make it only use the shape average for it's class under periods of congestion. any help would be greatly appreciated.

My policy map is hierarchical as follows with policy S2S policy on the output of my Site to Site interface.

policy-map all-traffic
class VOICE
priority 1536
class SERVER
priority 1536
priority 1536
class MGMTs
priority 1536
class class-default
policy-map S2S
class class-default
shape average 50000000
service-policy all-traffic

RE: cisco QoS and shaping policy question

can you please print the input policy and dscp making

RE: cisco QoS and shaping policy question

I am not using an input policy nor DSCP. traffic matching is done Via ACL.

RE: cisco QoS and shaping policy question

Then your QoS is wrong hence why its not working the way it should be working.
In QoS the ACL only identifies the traffic we want to mark, so what your doing is just identifying the traffic but not doing anything with it.
You need an ACL to identify the traffic your interested in.
then the DSCP or IP precedence value to mark.
after marking it you can there say what do you want to do with the traffic.
You need to mark the traffic inbound as it comes in to the router hence why you need an INPUT/IGRESS policy-map
Give it a priority going out OUTPUT/ENGRESS
here is an example of how to configure QoS. Im going to be marking voice traffic.

access-list 101 permit udp any eq 5060


class-map INPUT_VOICE
match access-group 101


policy-map INPUT
set ip dscp 46

we have identified and marked our traffic, now we can say what we want to do with it. You must apply this policy-map on the lan interface inbound

class-map OUTPUT_VOICE
match ip dscp 46

policy-map OUTPUT
priority bandwidth 1024

this policy must be applied on the ISP facing interface outbound. Another thing you need to take into account is your ISP honouring your marking.

RE: cisco QoS and shaping policy question

I think I get it now. so i should redirect my acl's to an input policy then use those classes. Knowing that my ISP does not take note of my markings, based on what i just read, i don't need to write anything on the packet itself, the class grouping should just work when i feed it into an output policy?

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