08-28-2008 09:38 PM - edited 03-03-2019 11:19 PM
hai,
cud any body tell about what will be the default Queing startegy in side class map which is configured inside a policy-map???
cud you please tell how it is configuring
Thanks in advance
Mahesh K V
08-28-2008 10:32 PM
default queueing is FIFO
first n first out
for example if u have a priority queueing configured in a class map
inside this calss map and this priority queue the queueing mechinisme will be FIFO
for default calss if u wanna know which contain ecery thing
called default cass
like
plicy-map policy1
class default-calss
fair-queue
please, if helpful Rate
08-28-2008 10:43 PM
Hi,
For serial interfaces at E1 (2.048 Mbps) and below, flow-based WFQ is used by default. When no other queueing strategies are configured, all other interfaces use FIFO by default.
fair-queue is for default-class only.
The default class of the policy map (commonly known as the class-default class) is the class to which traffic is directed if that traffic does not satisfy the match criteria of other classes whose policy is defined in the policy map.
http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/fqos_c.html
HTH..
08-28-2008 11:48 PM
thanx for the fast response,
actually i had read that "shape command is used under the class map is used for class based queing "....amm I rt or not???
weather what will be the default queuing staratagy inside this??
ingress
policy-map POLICY-OUTPUT-SHORT-PIPE-PREC
class class-default
shape average 1619001
service-policy SUB-POLICY-OUT-SHORT-PIPE-PREC
cud u please clear me this as well???
08-29-2008 12:05 AM
shaping not related to queueing
take this example
if u have framerelay topology with hub and spoks
the hub with sub interfaces and the bandwidth is 1Mb
and one spok has 512K and other 128K
so if the hub send traffic with 1Mb then gonna be a batleneck
so with shaping u can
shap the traffic when go to spok 1 make the shap the subinterface bandwidth to 512 and so on
good luck
if helpful Rate
08-29-2008 12:10 AM
Yes!!! you can use shape coammnd under class map
Class based shaping is also possible like class based WFQ.
Again for default-class it is fair-queue.
So here you are doing shaping & default fair-queuing under one class.
HTH...
08-29-2008 03:34 AM
actually i had read that "shape command is used under the class map is used for class based queing "....amm I rt or not???
weather what will be the default queuing staratagy inside this??
ingress
policy-map POLICY-OUTPUT-SHORT-PIPE-PREC
class class-default
shape average 1619001
service-policy SUB-POLICY-OUT-SHORT-PIPE-PREC
cud u please clear me this as well???
Ingress?
For egress, when there was congestion at the shaper, actual queuing would depend on what your subordinate policy, SUB-POLICY-OUT-SHORT-PIPE-PREC, defined. In other words, behavior should be similar to SUB-POLICY-OUT-SHORT-PIPE-PREC applied to a link providing the bandwidth defined to the shaper.
If your SUB-POLICY-OUT-SHORT-PIPE-PREC was defined only as:
policy-map SUB-POLICY-OUT-SHORT-PIPE-PREC
then all the traffic would flow through SUB-POLICY-OUT-SHORT-PIPE-PREC's class class-default. Since you've not defined any other classes within POLICY-OUT-SHORT-PIPE-PREC, all its traffic flow through its class-default but that traffic would only, when its class-default shaper was congested, be pushed to SUB-POLICY-OUT-SHORT-PIPE-PREC class-default.
08-29-2008 03:25 AM
"fair-queue is for default-class only."
True for most, but there are a couple platforms, with certain hardware, that FQ is supported in non-default-class queues. E.g. 7500 VIPs, 6500/7600 FlexWAN or SIP-200.
08-29-2008 03:19 AM
Default is FIFO except where the class-default default's to flow FQ (such as when implicit - i.e. not explicity defined as a class).
Unclear what you want to see "how" configured. The defaults would be obtained just by having the class defined to the policy without changing it with additional parameters.
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