[c-nsp] QoS Cisco Serie 800 and 1800
Alejandro Selios
aselios at gmail.com
Fri Nov 20 10:26:49 EST 2009
Hi,
I want to configure QoS on a Cisco's 800 and 1800 series router and I
couldn't make it work the way I want. I've configured three classes of
service called GOLD, SILVER and BRONZE, designed for low latency, low loss
and data respectively.
* I want the GOLD class to have a maximum bandwidth of 25%, even if there is
traffic in the other classes.
* The SILVER class has a minimum bandwidth of 50% and, if there's no traffic
in the GOLD queue, I want this class to take the available bandwidth which
is not used by the GOLD class. Thats means that the SILVER class has a 50%
of assured bandwidth and can increase to a maximum of 75% of the total
bandwidth.
* The BRONZE class has no assured bandwidth and can only take the bandwidth
which is not used for the other classes.
The problem is that with Cisco's QoS tools I have not reached the desired
goal. I have tried with different configurations and IOS and I couldn't get
any successful result . Below I attach the policy configuration that I have
tried (just to give you an example).
Is there any way in which I can achieve the behavior that was described
above?.
Thanks in advance.
Standard Configuration
-------------------------------------
policy-map QoS_POLICY
class GOLD
priority percent 25
police cir percent 25 pir percent 25
set dscp ef
class SILVER
set dscp af41
bandwidth percent 50
shape average percent 75
class class-default
fair-queue
set dscp af12
bandwidth percent 25
Hierarchical Configuration
---------------------------------------------
policy-map GOLD+SILVER
class GOLD
priority percent 33
police rate percent 33
class class-default
fair-queue
policy-map QOS
class GOLD+SILVER
shape average percent 75
bandwidth percent 75
service-policy GOLD+SILVER
class class-default
fair-queue
Note: This configuration was applied in a subinterface (xDSL, 802.1q
ethernet) and for the outgoing traffic.
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