Traffic Shaping for perticular traffic

class-map match-any SYSLOG-CMAP
match access-group name SYSLOG-ACL
policy-map SYSLOG-PMAP
class SYSLOG-CMAP
shape average 250000
interface GigabitEthernet0/1
ip address 1.1.1.1 255.255.255.252
ip flow ingress
load-interval 30
duplex full
speed 100
service-policy output SYSLOG-PMAP
Router1#show policy-map int GigabitEthernet0/1
GigabitEthernet0/1
Service-policy output: SYSLOG-PMAP
    Class-map: SYSLOG-CMAP (match-any)
      712495474 packets, 394564809213 bytes
      30 second offered rate 41000 bps, drop rate 23000 bps
      Match: access-group name SYS-LOG-ACL
        712495474 packets, 394564809696 bytes
        30 second rate 41000 bps
      Queueing
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 0/152567902/0
      (pkts output/bytes output) 559927554/295263742429
      shape (average) cir 250000, bc 1000, be 1000
      target shape rate 250000
    Class-map: class-default (match-any)
      3774914087 packets, 1413482437872 bytes
      30 second offered rate 2796000 bps, drop rate 0 bps
      Match: any
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 0/19837/0
      (pkts output/bytes output) 3817743535/1477901813111
=====================================================
Hi everyone,
In the above configuration, I configured traffic shaping to shape the syslog traffic to certain limit. My question is, Can I apply traffic shaping to perticular traffic ? What will happen to the remaining traffic ? We have ethernet hand-of to provider but total bandwidth we can use is 8M, which is controlled by ISP. We just send all the traffic without any shaping.
Thanks

Traffic shaping only works from the source. there is no way (other than policing - i.e., discard) to shape through the cloud.
If you tried to pace the traffic through the cloud, it's got to be buffered somewhere, causing latency, and ultimately discarded frames after the buffers fill.
Policing allows the traffic through until some threshold occurs (traditional frame = DE set at Bc, discard at Be), then the traffic is dropped.
FWIW
Scott

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I was told that you need to apply a shaping policy in order for QoS to always be engaged and not simply during times of congestion.
Nope.
You only need to shape when you're dealing with a path where you know the end-to-end bandwidth is less the the egress interface's physical bandwidth and where you cannot manage congestion further downstream along the end-to-end path.
On a similar note, i remember reading up on Ciscopress that you might NOT want to subject VoIP to any form of Shaping as this introdues delay and can cause Jitter.
Semi-true.
The problem can be mitigated by decreasing the shaper's Tc. Also, if shaper doesn't account for L2 overhead (and I believe many do not), you'll need to shape "slower" than the nominal bandwidth. The major problem with the latter, L2 overhead varies, as a percentage, based on packet size. So, you can either allow for worst case, which will best guarantee VoIP service, but tends to give up much of the available bandwidth, or you can shape for average case, which will make VoIP latency and jitter more variable but usually not so much to exceed its service requirements.
You can also bypass shaping for some traffic, but then you need to shape all your other traffic even slower to guarantee the non-shaped traffic bandwidth is always available. As you're effectively reserving this bandwidth, it then becomes unavailable for your other traffic even when unused.
An example of the latter:
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class class-default
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service-policy output shape-20MB
NB: BTW, the above doesn't account for L2 overhead, and I wouldn't recommend it for other reasons, but it should show how you can bypass the shaper.

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