11-15-2010 10:44 AM - edited 03-04-2019 10:28 AM
Hi all,
i am facing with some difficulties to implement QOS on my C6k router.
i have a sup720-3b with 7600-sip-400 and SPA-1XOC48\POS, IOS ver SXI3.
i want to implement a QOS policy that limit a specific ip address to a 200Mbps (TCP Traffic) BW.
i though about 2 options:
1. building class map with access list for this ip address and attached it to a policy map with an action of Shape Average
like this
class A
match access-list B
Policy map C
class A
Shape-Average 200Mbps
interface pos 1/1
service policy output C
2.building class map with access list for this ip address and attached it to a policy map with an action of Police CIR
like this
class A
match access-list B
Policy map C
class A
Police CIR 200Mbps
interface pos 1/1
service policy output C
i didn't succeeded with both of the above, the router says it cannot attached this kind of policy map to the interface.
can you please help me with this?
another Q is about mls qos. as i understand using mls qos globally is for the router be able to mark traffic. my question is if i am not using marking, and using classification based only on ip address do i need to enable mls qos?
appreciate your help.
11-15-2010 12:43 PM
hi all,
simple way is to use the rate-limit control, below is configuration example:
access-list 100 permit ip any host x.x.x.x
under interface x/x/x
rate-limit input access-group 100 5000000 8000 8000 conform-action transmit
exceed-action drop
this is example configure to limited to 5m. when traffic over 5M, allows burst
8000 bytes if traffic has bandwidth, if not drop the packets, you can change it for your situation).
Please note most the rate-limit control performes at inband traffic. This is because the traffic is going to drop when exceeed the rate-limt
since we try to avoid excessive traffic
to go router and waste you CPU if you are going to drop later anyway.
Jenny Wang
11-15-2010 01:14 PM
Hi
thanks.
due to topology i cannot use input. can i use the rate limit with output direction ?, i am asking that from the SPA-1XOC48 aspect.
but still,
if i want to use Police or shaping can i do that with the hardware i have ?, do i need to enable mls qos ?
i want to build a qos design that can help me add in the future more policies this is why i prefer using MQC over rate limit.
appreciate,
Avi
11-15-2010 06:57 PM
hi,
some route does support out band to do rate-limit control though it is not good design. You can go to intreface to try:
rate-limit output access-group 100 5000000 8000 8000 conform-action transmit
exceed-action drop
to see if support the outband rate-limit control.
If you want to use Qos, depends up what configuration you have, MLS usually it for swicth, layer 2 Qos.
If you can provide me your your configuration in the POS interface and I can advise better
Jenny
11-15-2010 09:05 PM
Hello Avi,
Unfortunately i am not able to find any document for SPA-1XOC48-POS/RPR which state that shaping is not
supported on this interface.
But I am quite sure that shaping is not supported on this card...may be because it is high speed card and expecting more traffic from
user..It is useless to buffer packets and decrease the performance.
anyway if you want to limit the traffic to 200m you can use policing also
something like
Policy-Map TEST
Class TEST
police cir 204800000 31250000 31250000 conform-action transmit exceed-action drop violate-action drop
I don;t know this information is useful to you or not
Regards
Mahesh
11-15-2010 10:01 PM
Hi,
in order to do this policy do i need to enable mls qos?, can i implement this service policy an an output ?
11-15-2010 10:05 PM
Hi Avi,
> By default, the EXP value is not copied into the DOT1P field of the DOT1Q header on Few router. To activate this automatic mapping, the command mls qos needs to be configured globally on the router. This command puts the ports in “trust EXP” mode and so, forces the copy of the EXP into the DOT1P.
>Yes you can implement service-policy in output.
Regards
Mahesh
11-15-2010 10:09 PM
so if i don't have an mpls network and my topology is only pure ip i understand that i don't need to enable mls qos ? of course if i am using only policing.
11-15-2010 10:05 PM
Hi,
my POS configuration is pretty simple. i am using regular ip address, i have an ip network not something special. i understand that mls qos is necessary to enable QOS on C6K, but if i am doing policing and class-map only on ip addresses i don't understand why do i need to enable it.
11-15-2010 10:33 PM
Yes Avi,
You don't need mls qos for your scenario.
Regards
mahesh
11-15-2010 10:53 PM
Thanks
i will chaeck it.
11-16-2010 07:04 AM
Hi,
Please give us complete policy-map & ACL & interface (&subinterface) configuration. Also provide log message printed on console.
Template you are using should be accepted.
Pavol
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