Traffic Shaping on Sub-interfaces

Hi all,
On my network i am trying to give preference to certain traffic type A over another traffice type B over a VSAT link.
the VSAT link is about 64Kbps/64Kbps and this link is connected to a router subinterface.
I initially thought of CBWFQ to reserve bandwidth for the differenct traffic types but there are restrictions to using CBWFQ on Sub interfaces.
Hence I tot of the option of shaping the less preffered traffic to a less than half the bandwidth say 24K will be a good idea however i worry that the contents of the shaping queue will constitute both the preffered traffic and the less preffered traffic hence introducing more delay to the more preffered traffic. which is not required.
Any other better ways to achieve this?

You can use hierarchical qos:
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a0080114326.shtml

Similar Messages

Issue in Sub-interface traffic on cisco 7609-s router

Hello please support,
I configured sub-interfaces and it is working properly, but some time sub-interface show traffic more then physical interface .
Like
int gi 3/32 0.13 Mbps 12:00 PM
int gi 3/32.11 855 Mbps 12:00 PM
as per my knowledge physical interface have cumulative traffic of all sub-interfaces.
interface GigabitEthernet3/32
no ip address
interface GigabitEthernet3/32.10
encapsulation dot1Q 10
ip address 172.20.128.77 255.255.255.252
ip ospf network point-to-point
ip ospf bfd
bfd interval 50 min_rx 50 multiplier 5
no bfd echo
no cdp enable
interface GigabitEthernet3/32.11
description interlink MPLS
encapsulation dot1Q 11
ip address 172.20.129.73 255.255.255.252
ip ospf network point-to-point
mpls ip
mpls label protocol ldp
Regards,
Damodar Nagar

I have not that graph so I am just guessing that you are noticing the difference between policing and shaping. It seems to me you are applying these techniques on each platform on a different way. Try to shape/police in the same order or only to shape.
Hope to help
Alessio
Sent from Cisco Technical Support iPad App

LMS 4.2 sub-interface not available in the instance selection window creating poller

Hi All,
I have sub-interfaces created on the switch and are in active(up/up) state,but these sub-interface not available for selection in the instance window while creating the poller, and am not able to monitor the traffic on these sub interface in the performance management.
LMS will not display the interfaces in the instance selection window if they are not active,but here the sub-interface are in active state but these are
not available. can anyboody help me out ??
Thanks,
Channa

Any Idea..??

Main Interface and Sub Interface

Hello,
I'm fairly new to ASA firewalls so some help is appreciated. Can anyone explain the point of the below config. I thought that normally when using Vlan's there would be no point on configuring a nameif & security level on the main interface? In this case what would configuring an ACL based NAT exemption on the Trunk interface do to traffic on the sub interfaces?
interface GigabitEthernet1/0
nameif Trunk
security-level 100
no ip address
interface GigabitEthernet1/0.100
vlan 100
nameif VLAN100
security-level 100
ip address 192.168.100.1 255.255.255.0 standby 192.168.100.2
interface GigabitEthernet1/0.101
vlan 101
nameif VLAN101
security-level 90
ip address 192.168.101.1 255.255.255.0 standby 192.168.101.2
interface GigabitEthernet1/0.102
vlan 102
nameif VLAN102
security-level 80
ip address 192.168.102.1 255.255.255.0 standby 192.168.102.2
Thanks Steve

You're right about the main interface.
If you use subinterfaces, you typically do not also want the physical interface to pass traffic, because the physical interface passes untagged packets. Because the physical interface must be enabled for the subinterface to pass traffic, ensure that the physical interface does not pass traffic by leaving out the nameif command. If you want to let the physical interface pass untagged packets, you can configure the nameif command as usual.
http://www.cisco.com/en/US/docs/security/asa/asa72/configuration/guide/intrface.html#wp1044006
Hope that helps

Shaping on physical and sub interface

Hello,
I currently have a few sub interfaces on my router for various reasons. I have a service policy applied to those sub interfaces and the service policy has the shaping command in it, and its all working fine. My physcial interface G0/0 is where I have an EIGRP neighbor and all of the routes are populated.
The problem is I want to apply a service policy to the physical interface and I am not able do so.
I get this:
router(config-if)#service-policy output g0-shape-out
user-defined classes with queueing features are not allowed in a service-policy at sub-interface/pvc
in conjunction with user-defined classes with queueing features in a service-policy at sub-interface/pvc
This is becuase the shaping command is already used in the service policy on the existing sub interfaces.
What I am wondering is, would it be best practice for me to not use the physical interface eg G0/0 when I have sub interfaces? For example my existing subinterfaces are g0/0.802, g0/0.803 ,g0/0.804. Should I setup a new sub interfaced call g0/0.100 and move the config from G0/0 to this new sub interface and use that as my main eigrp neighbor interface so that I can apply shaping to that sub interface? Or is there a better way to apply multiple services policies that include shaping?
Thanks,
Dan.

I can't put it as input because :
gw-a(config-subif)#service-policy input policy_upload
Traffic Shaping feature not supported in input policy.
Here's a show during a bandwidth test. You can see the offered rate is properly measured and is _way_ above the target shape rate.
gw-a#show policy-map interface Port-channel 1.2
Port-channel1.2
Service-policy output: policy_upload
    Class-map: class-default (match-any)
      624006 packets, 842239036 bytes
      5 minute offered rate 12774000 bps, drop rate 0 bps
      Match: any
      Queueing
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 0/0/0
      (pkts output/bytes output) 0/0
      shape (average) cir 100000, bc 400, be 400
      target shape rate 100000

Traffic Shaping ASR9k in output interface.

If we configure output traffic shaping on an ASR 9000 interface the Service Policy is not installed, however in cco we can find that traffic shaping is supported see the next link:
http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.2/qos/configuration/guide/b_qos_cg421asr_chapter_0100.html#ID407
My configuration is:
policy-map I4-TEST-OUT
class class-default
shape average 300000 bps
interface GigabitEthernet0/0/1/10
description <DESCRIPTION . CIRCUIT_ID>
bandwidth 300
service-policy input I4-TEST-IN
service-policy output I4-TEST-OUT
ipv4 address 1.1.1.1 255.255.255.252
ipv4 verify unicast source reachable-via rx
load-interval 30
ASR9k#show policy-map int g0/0/1/10
GigabitEthernet0/0/1/10 input: I4-TEST-IN
Class class-default
Classification statistics          (packets/bytes)     (rate - kbps)
    Matched             :                   0/0                    0
    Transmitted         : N/A
    Total Dropped       :                   0/0                    0
Policing statistics                (packets/bytes)     (rate - kbps)
    Policed(conform)    :                   0/0                    0
    Policed(exceed)     :                   0/0                    0
    Policed(violate)    :                   0/0                    0
    Policed and dropped :                   0/0
GigabitEthernet0/0/1/10 direction output: Service Policy not installed
RP/0/RSP1/CPU0:CE.HTCHP.RPE01#
as you can see we got a message "GigabitEthernet0/0/1/10 direction output: Service Policy not installed".
If I use a class instead of the class class-default the policy-map is correctly installed, If I use a child policy-map under the class class-default the policy is installed also.
Do you know if it is a restriction to use traffic shaping in an output interface and using the default class?
regards
thanks

I forgot to post the 15.x otuput; here it is.
R2#sh policy-map int f0/0
FastEthernet0/0
Service-policy output: SHAPE_10M
    Class-map: class-default (match-any)
      14 packets, 1056 bytes
      5 minute offered rate 0000 bps, drop rate 0000 bps
      Match: any
      Queueing
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 0/0/0
      (pkts output/bytes output) 14/1056
      shape (average) cir 10000000, bc 40000, be 40000
      target shape rate 10000000

How to make ASR9000 bridge domain forward traffic between sub interfaces of same physical interface?

Hi,
I regularly use bridge domains to connect sub interfaces on different vlans using this sort of configuration:
interface GigabitEthernet0/0/0/5.21 l2transport
description CUSTOMER A WAN
encapsulation dot1q 21
rewrite ingress tag pop 1 symmetric
interface GigabitEthernet0/0/0/10.3122 l2transport
description CUSTOMER A CORE
encapsulation dot1q 3122
rewrite ingress tag pop 1 symmetric
l2vpn
bridge group WANLINKS
bridge-domain CUSTOMERA
   interface GigabitEthernet0/0/0/5.21
   interface GigabitEthernet0/0/0/10.3122
When I try to use the same method to bridge two sub interfaces on the same physical interface so as to create a L2 VPN no data flows:
interface GigabitEthernet0/0/0/5.21 l2transport
description CUSTOMER A WAN
encapsulation dot1q 21
rewrite ingress tag pop 1 symmetric
interface GigabitEthernet0/0/0/5.22 l2transport
description CUSTOMER A WAN2
encapsulation dot1q 22
rewrite ingress tag pop 1 symmetric
l2vpn
bridge group WANLINKS
bridge-domain CUSTOMERA
   interface GigabitEthernet0/0/0/5.21
   interface GigabitEthernet0/0/0/5.22
If I add a BVI interface to the bridge domain then the CE devices at the remote end of the WAN interface can both ping the BVI IP but they remain unable to ping each other.
Is this because tag rewrites are not happening since packets don't leave the physical interface?
How can I work around this and establish a L2 connection between the two subinterfaces?
Thank you

a vlan is usually the equivalent of an l3 subnet, so linking 2 vlans together in the same bridge domain, likely needs to come with some sort of routing (eg a BVI interface).
If these 2 vlans are still in the same subnet, then there is still arp going on, from one host to the other that traverses the bD.
you will need to verify the state of the AC, the forwarding in the BD and see if something gets dropped somewhere and follow the generic packet troubleshooting guides (see support forums for that also).
that might give a hint to what the precise issue in your forwarding is.
regards
xander

Policy maps on port-channel sub-interfaces

We're trying to implement an enterprise QoS policy and I'm wondering how we can apply our QoS policy maps to several different sub-interfaces on a port-channel. In our case, we have both LAN and WAN connections that connect as VLANs on a switch and terminate as sub-interfaces on a port-channel that combines two Gigabit Ethernet interfaces on our router. The LAN connection will need to have a ingress service-policy to classify traffic as it comes from a customer LAN, and the WAN connections will have to have an egress service-policy to place the traffic classes into LLQ and CBWFQ queues as it leaves the router. Could I put both the ingress and egress service-policies on the physical router interface, or should I put them on the port-channel interface? Or should I apply them to the individual sub-interfaces? For example, I could put the ingress classification service-policy on the LAN sub-interface connection.
Any thoughts or insight would be helpful. Thanks.

I can't put it as input because :
gw-a(config-subif)#service-policy input policy_upload
Traffic Shaping feature not supported in input policy.
Here's a show during a bandwidth test. You can see the offered rate is properly measured and is _way_ above the target shape rate.
gw-a#show policy-map interface Port-channel 1.2
Port-channel1.2
Service-policy output: policy_upload
    Class-map: class-default (match-any)
      624006 packets, 842239036 bytes
      5 minute offered rate 12774000 bps, drop rate 0 bps
      Match: any
      Queueing
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 0/0/0
      (pkts output/bytes output) 0/0
      shape (average) cir 100000, bc 400, be 400
      target shape rate 100000

QoS:: Traffic Shaping query

Hi,
I want to apply QoS:: Traffic shaping with CBWFQ to our enterprise network, i want to ask you that where i should apply classification and QoS policy i mean to which interface. We have a Central site router 3660 and branch sites connected either to F.R E1 or TDM E1. I tried to create class maps and policy maps at the central site router and apply the desired policy to the desired branch site at the subinterface at the main router but CBWFQ is NOT supported at the subinterfaces, Should I apply policy maps at each branch site router or where ???
plz. HELP

Its always better that the classification be done at the access sites in your case. QOS policies can be applied on any interface. I think they can be applied to sub interface aswell . Please refer to the configuration documents on Frame-Relay to learn how to apply QOS on Frame-relay interfaces.

Traffic shaping G723 traffic between 2 companies

Hi,
Can someone put me on the right way to implement traffic shaping (QoS) for G723 traffic.
Situation:
Two companies connected to each other with a vpn tunnel. The hardware is Cisco 2621xm at the sublocation and on the hq location is an 2651XM.
There is an GRE tunnel configured between the two sites. The GRE tunnel is up and working.
On both sites there is an telephony system that can use G723 anr/or G711. Both telephony systems are connected to each other.
Voice is working, but now we want to implement QoS for the VOIP connection.
Has someone suggestions for me ?

Hi,
Appy a policy-map with the desired QoS policy to the tunnel interface.
First of all, issue 'qos pre-classify' on the the tunnel itself, otherwise the congestion management mechanism will be useless.
Cheers,
Gabriel

Traffic Shaping - can't get it to work

Hi
I’m attempting to create a basic traffic shaping policy in a lab environment but I can’t seem to get it to limit the download rate?
I can successfully achieve this with policing. I am testing the speed restriction using a broadband speed testing website, policing is clearly impacting the download rate, this is not the case with shaping. Please see below the shaping and policing policies, which I am attaching in turn to the vlan1 interface outbound.
Further I have messed around with the below shaping policy and set a fixed cir as in the policing policy but it still has no impact on the download speed.
Finally class SLOW_PC under PM POLICE matches an ACL matching traffic to and from a particular IP address. The speedlimiter is matching all traffic
Policy Map speedlimiter(Shaping)
    Class class-default
      Average Rate Traffic Shaping
     cir 1%
Policy Map POLICE
    Class SLOW_PC
     police cir 1048500 bc 32765
       conform-action transmit
       exceed-action drop
any help appreciated

Shaping and policing can both can be used for outbound traffic on an interface, but only policing can be used for inbound traffic. If you're trying to use shaping (which works by managing the queue) on inbound traffic (which has no manageable queue) it will have no effect. Policing is the only option in this case.

Can Anyone Help Me Configure My Verizon (D-Link) DSL-2750B "Traffic Shaping" (QoS)?

Well ... I just spent a wonderful hour and a half (not) bouncing around VZ technical support, etc. trying to get assistance regarding configuring my DSL router.* Between the low-quality Skype connection to India and my lack of success, I'm a little bummed out right now.
Could one of you perhaps help me? I'm trying to configure a single, wire-attached network node (port 4 of the router) so that it can only consume up to 320 Kbps of my 750 Kbps (7.5 Mbps) DSL bandwidth ... no matter what. This results from this node consuming virtually all of the circuit's bandwidth when streaming or during bulk file transfers.
I have tried to remedy the problem using priority with no discernible impact.
The Quality of Service (QoS) element called Traffic Shaping (Services | QoS | Traffic Shaping), described on Page 51 of the VZ DSL-2750B User Manual , appears to be the ideal solution to my problem. Repeated attempts at activating this QoS have all resulted in no throttling of bandwidth consumption.
My most recent attempt was to define the device on Port 4 as the DMZ host ... and then apply a new rule (320 TX, 320 RX) to this interface. Again, no joy.
Does anyone have any experience with this service on this router?
Am I chasing my tail trying to configure the router without validating that my circuit is not configured with "Fastpath (PSE) inactive"?
If the circuit configuration is a potential problem, which office should I ask for at VZ customer service?
Here is the information from the System page of the Router Control Panel:
Gateway ID: PX2M1BC000000
Software Version: 5.4.12.1.44
Release Date: Feb 19 2012
Platform: D-Link DSL-2750B
Board Tag:... Ntag-5_4_12_1_44
Compilation Flags:... LIC=/home/bat/bat/dlink_bcm96328_5_4_12_1/20120219_1343/conf/jpkg_bcm9636x_dlink.lic CONFIG_RG_PROD_IMG=y DIST=DLINK_DSL2750B
I'll note that the Router provides a notification that "RX QOS might not operate when Fastpath (PSE) is active" when I update the router configuration page concerning Traffic Shaping. Because Fastpath is not mentioned in the User Manual, I'm guessing that Fastpath (PSE) might be a configurable attribute of the circuit servicing my PoP, but I have no idea if this is the case.
I searched for relevant messages on this board ... without success. If this has already been addressed, please provide a link, and accept my apologies. (My Google-Fu tends to be weak.)

The asterisk in the first post refers to the following summary of events:
10:40 - Attempt to solve my configuration question using VZ chat begins.
10:49 - VZ chat agent Danish refers me to phone support. (Chat ID number is 020813176471 if you're with VZ and are interested.)
10:50 - Call VZ phone support.
11:02 - Talk with Angel. Because she has not heard of, nor received training in, "traffic shaping," she says my question about configuring this VZ DSL modem must be addressed by "Premium Technical Support." She transfers me.
11:13 - Talk with Pamela. Premium Technical Support only responds to questions about 3d party products. Because my question concerns a VZ DSL modem, Basic Technical Support is responsible. She transfers me.
11:17 - Talk with Joe. He says either the vendor (D-Link) or premium technical support is required. Because I had already tried with D-Link (they referred me to Verizon, as this modem was built exclusively for VZ), I explained what I had already experienced, and described how I wanted "assistance configuring my VZ DSL modem, specifically a feature described on page 51 of the User Manual." He transfers me.
11:23 - The automated phone system asks for my 12-digit customer ID. I wasn't able to find it fast enough, and rolled through to Financial Services. Eventually Trig picked up, listened to my story, and transferred me to "Technical Support" providing the direct dial number, just in case (866.945.79xx).
11:32 - Entered the phone queue. Lots of hissing and clicks.
11:35 - Talk with Monika. (The voice clarity from this point onward was on the order of 1st-generation Skype. Between the horrible language problem -- Monika is in India don'cha know -- and the lousy line quality, this was the most frustrating.) No matter what I said, I couldn't convey the reason for my call. I asked to talk with a supervisor, which Monika related was not possible. She also related that she could not transfer me to an American POC or supervisor.
12:01 - Hung up the phone ... and started down the path that led to my post immediately above.
I was repeatedly queried about the account name and number throughout the process. Conveying this information was especially challenging during the Indian call segment.

Load balancing on sub-interfaces (3 links)

Hello.
I am trying to load balance between the three links of a bundle. Traffic comes and goes with the same bundle interface.
Launched 5 threads TCP\UDP with different SRC DST IP addresses and see the following balances:
IOS-XR               Monitor Time: 00:00:30          SysUptime: 106:39:28
                          Last Clear:   00:00:22
Protocol:General
Interface             In(pps)      Out(pps)      InPkts/Delta   OutPkts/Delta
Te0/1/0/0             11381           628        102062/25512       256/64
Te0/1/0/1             33849         55965        303244/75700    505364/126230
Te0/1/0/2             11363             0        100800/25200         0/0
Quit='q',     Clear='c',    Freeze='f', Thaw='t',
Next set='n', Prev set='p', Bytes='y', Packets='k'
(General='g', IPv4 Uni='4u', IPv4 Multi='4m', IPv6 Uni='6u', IPv6 Multi='6m')
We have 10G switch connected to asr9010 three ports and the following configuration:
interface TenGigE0/1/0/0
bundle id 1 mode active
bundle port-priority 2
interface TenGigE0/1/0/1
bundle id 1 mode active
bundle port-priority 2
interface TenGigE0/1/0/2
bundle id 1 mode active
interface Bundle-Ether1.75
ipv4 address 25.0.0.1 255.255.255.252
encapsulation dot1q 75
interface Bundle-Ether1.76
ipv4 address 26.0.0.1 255.255.255.252
encapsulation dot1q 76
RP/0/RSP0/CPU0: ios # sh bundle load-balancing bundle-e1 detail location 0/1/CPU0
Tue Jun 4 07:03:07.605 UTC
Bundle-Ether1
Type: Ether (L3)
Members <current/max>: 3/3
Total Weighting: 3
Load balance: Default
Locality threshold: 65
Avoid rebalancing? False
Sub-interfaces: 3
Member Information:
    Port: LON ULID BW
    Te0/1/0/0 0 0 1
    Te0/1/0/1 1 1 1
    Te0/1/0/2 2 2 1
Sub-interface Information:
    Sub-interface Type Load Balance Locality
                                        Hash Threshold
    Bundle-Ether1.76 L3 Default 65
    Bundle-Ether1.75 L3 Default 65
    Bundle-Ether1.100 L3 Default 65
Platform Information:
=====================
                  * Bundle Summary Information *
Interface: Bundle-Ether1 Ifhandle: 0x08000160
Lag ID: 1 Virtual Port: 255
Number of Members: 3 Local to LC: Yes
Hash Modulo Index: 3
Member Information:
LON Interface ifhandle SFP port slot remote / rack_id
Te0/1/0/0 0x02000140 0 12 0 1 0/0
Te0/1/0/1 0x02000180 1 13 0 1 0/0
Te0/1/0/2 0x020001c0 11 2 0 1 0/0
                   * Bundle Table Information *
[NP 0]:
   Unicast (Global) LAG table
idx local LON VQI port
   1 0 0 12 0
   2 0 1 13 0
   3 0 2 11 0
[NP 1]
   Unicast (Global) LAG table
idx local LON VQI port
   1 0 0 12 0
   2 0 1 13 0
   3 0 2 11 0
[NP 2]:
   Unicast (Global) LAG table
idx local LON VQI port
   1 0 0 12 0
   2 0 1 13 0
   3 0 2 11 0
[NP 3]
   Unicast (Global) LAG table | Multicast (Local) LAG table
idx local LON VQI port | idx local LON VQI port
   1 0 0 12 0 1 1 2 11 0
   2 0 1 13 0 2 0 0 0 0
   3 1 2 11 0 3 0 0 0 0
[NP 4]:
   Unicast (Global) LAG table | Multicast (Local) LAG table
idx local LON VQI port | idx local LON VQI port
   1 1 0 12 0 1 1 0 12 0
   2 0 1 13 0 2 0 0 0 0
   3 0 2 11 0 3 0 0 0 0
[NP 5]
   Unicast (Global) LAG table | Multicast (Local) LAG table
idx local LON VQI port | idx local LON VQI port
   1 0 0 12 0 1 1 1 13 0
   2 1 1 13 0 2 0 0 0 0
   3 0 2 11 0 3 0 0 0 0
[NP 6]
   Unicast (Global) LAG table
idx local LON VQI port
   1 0 0 12 0
   2 0 1 13 0
   3 0 2 11 0
[NP 7]
   Unicast (Global) LAG table
idx local LON VQI port
   1 0 0 12 0
   2 0 1 13 0
   3 0 2 11 0
================================================== =============================

20 flows and a bit better result:
IOS-XR               Monitor Time: 00:00:08          SysUptime: 133:33:44
                     Last Clear:   00:00:06
Protocol:General
Interface             In(pps)      Out(pps)      InPkts/Delta   OutPkts/Delta
Te0/1/0/0             11794         14977             0/44696         0/44484
Te0/1/0/1             10682          8786             0/37924         0/25456
Te0/1/0/2             18243         16958             0/44596         0/57579
Quit='q',     Clear='c',    Freeze='f', Thaw='t',
Next set='n', Prev set='p', Bytes='y', Packets='k'
(General='g', IPv4 Uni='4u', IPv4 Multi='4m', IPv6 Uni='6u', IPv6 Multi='6m')
Can the ASR9K more or less normal balance on uneven number of links?

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

Traffic-shaping for delay sensitive traffic

Hello, I would like to verify the use of a traffic-shaping policy within an MQC. 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. This apparently is critical when you have apps like VoIP.
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.
Below is a sample config. If you can post an authoritative source on CCO that explains this I would greatly appreciate it.
Regards,
-Mike
policy-map QoS-Policy
class realtime
priority 512
police 512000 conform-action transmit exceed-action drop
class preferred
bandwidth remaining percent 40
random-detect dscp-based
class missioncritical
bandwidth remaining percent 39
random-detect dscp-based
class trans-apps
bandwidth remaining percent 16
random-detect dscp-based
class general
bandwidth remaining percent 1
random-detect dscp-based
class class-default
bandwidth remaining percent 4
random-detect dscp-based
policy-map shape-20MB
class class-default
shape average 2000000
service-policy QoS-Policy
interface Serial0/0/0
service-policy output shape-20MB

Disclaimer
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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:
policy-map QoS-Policy
class preferred
bandwidth remaining percent 40
random-detect dscp-based
class missioncritical
bandwidth remaining percent 39
random-detect dscp-based
class trans-apps
bandwidth remaining percent 16
random-detect dscp-based
class general
bandwidth remaining percent 1
random-detect dscp-based
class class-default
bandwidth remaining percent 4
random-detect dscp-based
policy-map shape-20MB
class realtime
priority 512
police 512000 conform-action transmit exceed-action drop
class class-default
shape average 1950000
service-policy QoS-Policy
interface Serial0/0/0
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.

Traffic Shaping on Sub-interfaces

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