07-13-2012 06:22 AM - edited 03-07-2019 07:45 AM
hi ,
i have a router that IS A GATEWAY for internet , and another router which is Bras which is used to connect to Dslam
my request is , i want to gurantee didicted cir for specific vlan which is vlan 10
im using subinterface connect to router gateway which is the gateway of my vlan 10.
the problem is , i cant use policymap on subinterface !!!!!!!! it is not allowed to use it, im using router ios 7206 .
so i began to think in another solution which is applying the polivy map on the interface Gi0/1 as u see from my gigure below ,
but the problem is , the cpu takse high and rech up to 90 % , it consume 15 % after adding the polivy map >
i want a solution ,
could i use policy on the swithch ??? and consume the cpu on the other routers ???
is there any other optinal soultion to use QOS ?????
Bras router
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switch vlan 10 ===========routerGi0/1=============>internet
regards
Solved! Go to Solution.
07-13-2012 09:38 AM
have a look at this link:
http://www.cisco.com/en/US/docs/ios/12_2/qos/command/reference/qrfcmd9.html#wp1077189
rate limitting as its name implies, limits the bandwidth at a certain rate, with a burst. it doesnt guarantee a minimum bandwidth, nor does the shape average. but bandwidth command does it.
if you want a maximum of 1mbps extra to be available, add this command under policy map along with the bandwidth command:
police 16000000 exceed-action drop
fair-queue command enables qos Weighted Fair Queue, allowing other traffic flow to fairly share the bandwidth available. sorry u have to set it under the class-default, it is optional but good to be there.
HTH,
Soroush.
07-13-2012 11:11 AM
I believe you could find this link useful:
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a0080114326.shtml
Hope it Helps,
Soroush.
07-13-2012 07:06 AM
hi Ahmed
to reserve a minimum bandwidth for accessing internet, u need to do it on the exit point here the router G0/1 is the right choice. applying policy-map to other interfaces and vlan int, wouldnt give u the desired result.
there might be a problem with QoS setting u done, could u post ur QoS settings?
Hope it Helps,
Soroush.
07-13-2012 07:35 AM
hi ,
my config is not complex , here is it
=====================================
Extended IP access list sawa
10 permit ip xxx.xx.66.128 0.0.0.127 any (387727 matches)
policy-map sawa
class sawa
bandwidth 15000
shape average 15000000
class class-default
interface gi0/1
service policy output sawa
=======================================
as u see , i want reserve bw for my subnet to be as a cir ,
but u didnt answered me , why it will not work on another placce like switch or the Bras router?????
regards
07-13-2012 08:04 AM
first of all, i dont see any Class-map there, you have to create a class.
ip access-list extended (sawa)
class-map sawa
match access-list sawa
policy-map sawa
class sawa
shape average 15000000
interface gi0/1
service policy out sawa
do you want to limit ur vlan 10 to 15Mbps or you want to reserve a bandwith for the vlan too?
whenever you want to limit or guarantee a certain amount of bandwith for a group of users, u have to do it on the exit point or the bottle neck. because the closer to the source (users) it is in ur own LAN and usually there is no bandwidth concerns. besides, there are risks that other traffic flows saturate the link to the internet if u ever want to reserve bw.
if u just want to limit the amount of bandwith ur users can use, then u can apply it on the vlan interface, if ur switch is capable of it.
HTH,
Soroush.
07-13-2012 08:17 AM
sorry , i forgot to post it :
here is my class map
===========================
Class Map match-all sawa (id 10)
Match access-group name sawa
=============================
i want to reserve at minimum bw for 15 m to be as cir , and and to give the users more if possible , but the most important is to gurantee cir 15 m
im using switch catalysit 2960g ,
i didnt understand ur menaing with bottle neck ? do u mean to apply the policy on the last point Gi0/1 , or the closer point to the vlan users ???
regards
07-13-2012 09:18 AM
Ahmed,
you wouldnt be able to set that kind of QoS on a C2960. if you want to reserve a bandwidth and give more if available, just keep the bandwidth command in ur policy-map, remove the shape average. this way you reserve a minimum bw for that class and users will use extra bandwidth if available. and apply it to Gi0/1. also add fair-queue command under the class-default policy-map.
by bottleneck, i meant the point that has lesser bandwidth so u need to reserve ur minimum there. in ur case, it is the connection to the internet gi0/1.
EDITED.
Hope it Helps,
Soroush.
07-13-2012 09:25 AM
hii , thanks soo much for ur help
i want to correct something , i want users didicated 15 m , but in the same time if avaiblabe bw , just give them more up to 1 mega only .
1stly , wts the benifie of shape avergae comand ?? which i will remove ?
2nd thing
on the subinterface which the gateway of my subnet i was typing a rate limit comamnd , do i need this commands ??
im using policy map , do i need this commadns to be on my subinterface ???
=================================
interface GigabitEthernet0/2.13
description OFFICE-VLAN
encapsulation dot1Q 13
ip address xx.xx.79.1 255.255.255.224
rate-limit input 15000000 2812500 5625000 conform-action transmit exceed-action drop
rate-limit output 15000000 2812500 5625000 conform-action transmit exceed-action drop
3rd thing
wts the benifit of using fair-queue command ???
im really appreciating ur help
with my best regards
07-13-2012 09:38 AM
have a look at this link:
http://www.cisco.com/en/US/docs/ios/12_2/qos/command/reference/qrfcmd9.html#wp1077189
rate limitting as its name implies, limits the bandwidth at a certain rate, with a burst. it doesnt guarantee a minimum bandwidth, nor does the shape average. but bandwidth command does it.
if you want a maximum of 1mbps extra to be available, add this command under policy map along with the bandwidth command:
police 16000000 exceed-action drop
fair-queue command enables qos Weighted Fair Queue, allowing other traffic flow to fairly share the bandwidth available. sorry u have to set it under the class-default, it is optional but good to be there.
HTH,
Soroush.
07-13-2012 11:08 AM
hi ,
thansk soo much for ur info ,
but
could i apply policymap to subinerface ??? or it is limited to specific types of QOS ???
i have two another questions :
1- assume i applied policymao interface gi0/1 as out ,
do i need to apply this policy in the resurn path ??? i mean that i controlled the traffic when it leaved gi0/1 but i didnt control the traffic when i come into interface gi0/1 ??? does applying it out , enoguh???
another thing , how to control upload & dowload , i mean by bandwith command i controlled the bandwith , but how about if i want to control the upload and download , wt do i need ??
with my best regards
07-13-2012 11:11 AM
I believe you could find this link useful:
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a0080114326.shtml
Hope it Helps,
Soroush.
07-13-2012 11:13 AM
up
07-24-2012 04:10 AM
hi ,
i tried to type the command
police 16000000 exceed-action drop
under the policymap command ???
i tried it on two ioses one 7200 and the other 7600 but cnt type it !!!!!
did u mean another thing ???
regards
07-24-2012 04:16 AM
here is output after tryig to type the command
Gateway2(config-pmap-c)#police 16000 ?
<500-512000000> Burst bytes
bc Conform burst
conform-action action when rate is less than conform burst
pir Peak Information Rate
as u see, there is no exceed-action option
is there any method to limit the total bw to 16 mega ???
regards
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