04-25-2008 01:56 PM - edited 03-05-2019 10:37 PM
Hey guys,
I was wondering if it would be possible to do prioritization based on IP subnets? I have one subnet for internet access but runs through the same switches as the most important traffic. How could I give priority to the more important subnet? Thanks in advance!
04-25-2008 03:40 PM
Surely. You simply set up your subnet to be matched:
ip access-list extended priority-subnet
permit ip any 192.168.1.0 255.255.255.0 <= if by destination
permit ip 192.168.1.0 255.255.255.0 any <= if by source
Then do a class for that ACL:
class-map match-all CLASS-PRIO-NET
match access-group name priority-subnet
Then put it in a policy:
policy-map QOS-POLICY
class CLASS-PRIO-NET
priority percent 35
Hope that's not too much info or oversimplified.
Paul
04-28-2008 07:13 AM
Thank you for that!!!
If I wanted to give one subnet 95% of the bandwidth, what would happen to the other subnets?
Also, is there a way that I can push this to switches to do qos at their level?
04-28-2008 07:46 AM
Not a simple question, but basically the bandwidth limits you set are only in cases where there is not enough bandwidth. If you give a class 95%, and 95% is available, it gets it. The exception is LLQ - "priority" keyword - where anything that exceeds the LLQ bandwidth is dropped. I.e., you can burst UP into LLQ bandwidth if it's available, but you can't burst down (exceed LLQ limits).
*Generally* (and it's a HUGE generalization), you use switches to mark traffic at the edge and use routers to enforce the limits, at least at remote sites. You can do limits on switches but it is not easy (compared to MQC).
Check the QoS SRND Guide, it is an excellent resource. http://www.cisco.com/en/US/netsol/ns656/networking_solutions_program_home.html
Paul
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: