3750X rate-limit (QoS)

Hello,
I'm trying to configure a rate-limit in a 3750X but I'm not seeing any result...
These are my configurations:
RF#show run
Building configuration...
Current configuration : 23410 bytes
! Last configuration change at 08:53:35 UTC Sun Mar 14 1993
version 15.0
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname RF
boot-start-marker
boot-end-marker
no aaa new-model
switch 1 provision ws-c3750x-48p
system mtu routing 1500
ip routing
ip domain-name erf.carco.com.mx
rep admin vlan 100
mls qos
spanning-tree mode pvst
spanning-tree extend system-id
vlan internal allocation policy ascending
vlan 2
vlan 4
vlan 6
vlan 8
vlan 10
vlan 20
vlan 21
vlan 22
vlan 23
vlan 25
vlan 26
vlan 30
vlan 50
vlan 53
vlan 70
vlan 81
vlan 91
vlan 92
vlan 93
vlan 95
vlan 96
vlan 99
vlan 100
vlan 102
vlan 110
vlan 122
vlan 129
vlan 200
vlan 213
vlan 227
vlan 333
vlan 357
vlan 417
vlan 444
vlan 500
vlan 502
vlan 555
vlan 700
vlan 712
vlan 910
vlan 911
vlan 951
vlan 1105
vlan 1508
vlan 1830
vlan 1870
vlan 1890
vlan 1891
vlan 1892
class-map match-any test
match access-group 100
policy-map test
class test
police 150000000 512000 exceed-action drop
interface Loopback0
ip address 10.20.40.106 255.255.255.0
interface Port-channel22
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport mode trunk
bandwidth 10000000
rep segment 10
interface Port-channel24
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport mode trunk
bandwidth 10000000
rep segment 10
interface FastEthernet0
no ip address
no ip route-cache
shutdown
interface GigabitEthernet1/0/1
interface GigabitEthernet1/0/2
interface GigabitEthernet1/0/3
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport trunk allowed vlan 2,10,50,53,60,70,91-93,95,96,99,100,110,213,227
switchport trunk allowed vlan add 500,700,910,911,951,1830,1870,1890-1892
switchport mode trunk
no logging event link-status
shutdown
speed 1000
duplex full
interface GigabitEthernet1/0/4
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport trunk allowed vlan 2,8,10,20,50,53,70,91-93,95,96,99,100,110,213
switchport trunk allowed vlan add 227,500,700,910,911,951,1830,1870,1890-1892
switchport mode trunk
shutdown
speed 1000
duplex full
interface GigabitEthernet1/0/5
interface GigabitEthernet1/0/6
interface GigabitEthernet1/0/7
interface GigabitEthernet1/0/8
interface GigabitEthernet1/0/9
interface GigabitEthernet1/0/10
switchport access vlan 91
switchport mode access
logging event link-status
interface GigabitEthernet1/0/11
interface GigabitEthernet1/0/12
interface GigabitEthernet1/0/13
interface GigabitEthernet1/0/14
interface GigabitEthernet1/0/15
switchport access vlan 91
switchport mode access
logging event link-status
interface GigabitEthernet1/0/16
interface GigabitEthernet1/0/17
interface GigabitEthernet1/0/18
interface GigabitEthernet1/0/19
interface GigabitEthernet1/0/20
switchport access vlan 91
switchport mode access
logging event link-status
interface GigabitEthernet1/0/21
interface GigabitEthernet1/0/22
interface GigabitEthernet1/0/23
interface GigabitEthernet1/0/24
interface GigabitEthernet1/0/25
switchport access vlan 910
switchport mode access
interface GigabitEthernet1/0/26
interface GigabitEthernet1/0/27
interface GigabitEthernet1/0/28
interface GigabitEthernet1/0/29
interface GigabitEthernet1/0/30
interface GigabitEthernet1/0/31
interface GigabitEthernet1/0/32
interface GigabitEthernet1/0/33
interface GigabitEthernet1/0/34
interface GigabitEthernet1/0/35
interface GigabitEthernet1/0/36
interface GigabitEthernet1/0/37
no switchport
bandwidth 150000
ip address 10.20.103.13 255.255.255.252
rate-limit output access-group 100 24000000 3000000 3000000 conform-action transmit exceed-action drop
logging event link-status
interface GigabitEthernet1/0/38
interface GigabitEthernet1/0/39
interface GigabitEthernet1/0/40
interface GigabitEthernet1/0/41
interface GigabitEthernet1/0/42
interface GigabitEthernet1/0/43
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport mode trunk
bandwidth 10000000
channel-group 24 mode on
interface GigabitEthernet1/0/44
interface GigabitEthernet1/0/45
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport trunk allowed vlan 2,10,50,53,60,70,91-93,95,96,99,100,110,213,227
switchport trunk allowed vlan add 500,700,910,911,951,1830,1870,1890-1892
switchport mode trunk
shutdown
interface GigabitEthernet1/0/46
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport trunk allowed vlan 2,10,50,53,60,70,91-93,95,96,99,100,110,213,227
switchport trunk allowed vlan add 500,700,910,911,951,1830,1870,1890-1892
switchport mode trunk
shutdown
interface GigabitEthernet1/0/47
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport mode trunk
bandwidth 10000000
channel-group 22 mode on
interface GigabitEthernet1/0/48
switchport trunk encapsulation dot1q
switchport trunk native vlan 6
switchport trunk allowed vlan 2,7,10,20,50,53,70,91-93,95,96,99,100,110,213
switchport trunk allowed vlan add 227,700,910,911,951,1830,1870,1890-1892
switchport mode trunk
logging event link-status
shutdown
interface GigabitEthernet1/1/1
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport trunk allowed vlan 2,8,10,20,50,53,60,70,91-93,95,96,99,110,213,227
switchport trunk allowed vlan add 500,700,910,911,951,1830,1870,1890-1892
switchport mode trunk
shutdown
interface GigabitEthernet1/1/2
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport trunk allowed vlan 2,8,10,20,50,53,60,70,91-93,95,96,99,110,213,227
switchport trunk allowed vlan add 500,700,910,911,951,1830,1870,1890-1892
switchport mode trunk
shutdown
interface GigabitEthernet1/1/3
switchport trunk encapsulation dot1q
switchport trunk native vlan 6
switchport trunk allowed vlan 2,6,8,10,20,50,53,70,91-93,95,96,99,100,110,213
switchport trunk allowed vlan add 227,700,910,911,951,1830,1870,1890-1892
logging event link-status
shutdown
interface GigabitEthernet1/1/4
switchport trunk encapsulation dot1q
switchport trunk native vlan 6
switchport trunk allowed vlan 2,6,8,10,20,50,53,70,91-93,95,96,99,100,110,213
switchport trunk allowed vlan add 227,700,910,911,951,1830,1870,1890-1892
switchport mode trunk
logging event link-status
shutdown
interface TenGigabitEthernet1/1/1
interface TenGigabitEthernet1/1/2
interface Vlan1
no ip address
shutdown
interface Vlan6
description ***LANERF**
ip address 10.20.6.106 255.255.255.0
no ip redirects
interface Vlan23
description < TRANSITO MUR >
no ip address
no ip redirects
interface Vlan100
description < VLAN MAN >
ip address 10.20.100.106 255.255.255.0
no ip redirects
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 7 032368342B2F0F
ip ospf dead-interval minimal hello-multiplier 4
router ospf 1
router-id 10.20.40.106
auto-cost reference-bandwidth 100000
area 0.0.0.0 authentication message-digest
area 1.80.1.1 authentication message-digest
redistribute connected subnets
redistribute static subnets
passive-interface default
no passive-interface Vlan23
no passive-interface Vlan100
no passive-interface GigabitEthernet1/0/37
network 10.20.6.0 0.0.0.0 area 0.0.0.0
network 10.20.40.106 0.0.0.0 area 0.0.0.0
network 10.20.91.6 0.0.0.0 area 0.0.0.0
network 10.20.100.106 0.0.0.0 area 0.0.0.0
default-information originate
ip http server
ip http secure-server
access-list 100 permit ip 10.50.80.0 0.0.0.255 10.80.80.0 0.0.0.255
access-list 100 permit ip 10.80.80.0 0.0.0.255 10.50.80.0 0.0.0.255
snmp-server community ASComRO RO
line con 0
line vty 0 4
login
line vty 5 15
login
event manager applet track_qos_down authorization bypass
event syslog pattern "TRACKING-5-STATE: 15 ip sla 15 reachability Up->Down"
action 1 cli command "enable"
action 2 cli command "configure terminal"
action 3 cli command "interface giga1/0/37"
action 4 cli command "rate-limit output access-group 100 400000000 50000000 50000000 conform-action transmit exceed-action drop"
action 5 cli command "end"
event manager applet track_qos_up authorization bypass
event syslog pattern "TRACKING-5-STATE: 15 ip sla 15 reachability Down->Up"
action 1 cli command "enable"
action 2 cli command "configure terminal"
action 3 cli command "interface giga1/0/37"
action 4 cli command "no rate-limit output access-group 100 400000000 50000000 50000000 conform-action transmit exceed-action drop"
action 5 cli command "end"
end
ERF#
ERF#show mls qos
QoS is enabled
QoS ip packet dscp rewrite is enabled
ERF#show mls qos inter gigabitEthernet 1/0/37
GigabitEthernet1/0/37
trust state: not trusted
trust mode: not trusted
trust enabled flag: ena
COS override: dis
default COS: 0
DSCP Mutation Map: Default DSCP Mutation Map
Trust device: none
qos mode: port-based
When I apply the command I'm seeing a gauge using a 3rd party but I'm not seeing that the traffic will be truncated @ 50Mbps.
Any thoughts???

Hi
Bandwidth commands allocates the particular amount of bandwidth you mention or configure over there.
Basically you have the liberty to configure upto 75% of the available interface bandwidth to different classes.
most widelys used with CBWFQ technique..
so while configuring up the same better to watch out for the exact bandwidth value keyed in on the interface to have your alloocation work properly.
policing basically used for limiting the traffic or to control the bursts by dropping them or marking them with different ip precedence or DSCP values.
its very much similar to the rate-limit command applied on the interface level which again uses token bucket system either single or dual based on the configuration parameters.
for more info on above mentioned clis do check these links..
http://www.cisco.com/en/US/tech/tk543/tk545/tsd_technology_support_protocol_home.html
http://www.cisco.com/en/US/tech/tk543/tk544/tsd_technology_support_protocol_home.html
regds

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Screenshots attached
thanks
screenshots attached

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2960(config-pmap)#class traffic
2960(config-pmap-c)#police 10000000 8000 exceed-action drop
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a) Example
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2960(config)#int fa0/1
2960(config-if)#service-policy input Control
>>>>>> This will rate-limit traffic coming from the PC

Per user bandwidth rate limit.

How to configure per user bandwidth rate limit for wireless guest client, authentication server is ISE 1.2 & wireless controller is 5760.

The Cisco 5760 WLC supports better QoS than other c
ontrollers, allowing prioritization of mission-crit
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applications:
●
The Cisco 5760 WLC supports four wireless hardware
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●
The Cisco 5760 WLC follows MQC based commands, allo
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●
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http://www.cisco.com/en/US/partner/docs/wireless/controller/7.0MR1/configuration/guide/cg_controller_setting.html#wp1254532
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http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_command_reference_chapter09186a0080087f26.html#wp1037428
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Catalyst 3560 Switch Command Reference, Rel. 12.2(25)SEE
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12225see/cr/index.htm
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http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12225see/scg/swqos.htm#wp1253412
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Hii Netpros,
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Thanks

This topic is probably better suited in another Infrastructure forum, but I suppose it depends on which features are supported by your Cisco hardware and software. This doc discusses a variety of options:
http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfpolsh.html
For example, with the older CAR (committed access rate) approach:
interface FastEthernet5/0
     rate-limit input access-group 101 20000000 [normal burst size] [excess burst size] conform-action transmit exceed-action drop
     rate-limit input access-group 102 5120000 [normal burst size] [excess burst size] conform-action transmit exceed-action drop
access-list 101 permit ip 10.10.10.3 0.0.0.0
access-list 102 permit ip 10.10.10.4 0.0.0.0
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Hi
We have a need to limit bandwidth on guest ssid that is tunnelled to anchor controller. The 2504 doesn't have rate limiting options but the 5500 does. If we enabled the rate limit on the SSID details on the foreign would it work (seeing as though the anchor can't have same settings). I would have thought that the access points terminate on the foreign therefore the rate limit would apply there.
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Thanks. It would be nice if Cisco documentation actually clarified this as all guest anchor docs seem not to mention having to have both controllers supporting QoS profiles.

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Hi,
My network infrastructure as simple as following:
LAN(edge switches 3560).......>Aggregator switch(3750)........>Firewall(ASA 5510)........>Router.......>Internet
I define 3 wireless VLANs with 3 SSIDs on the Aggregator switch(3750):
1. one SSID for company employees.
2. one SSID for wireless IP phones.
3. one SSID for company guest which access only internet.
And the wireless APs connected to the LAN(edge switches) direct with trunks.
My question is how to apply a rate limit for SSID for company guest to access internet with B.W. of 128kbps only.
I tried policy map to be applied on the aggregator switch(3750) on the VLAN interface, but, it is not working.
So, any suggested help, please.

Hi Ahmed:
With autonomous APs, rate limiting isn't possible. All the autonomous APs support is QoS and that's pretty iffy. At the core of the issue, you're dealing with radio waves and which ones arrive at the radio first, and who was prevented from talking because someone else was talking. Dealing with these QoS and traffic shaping/policing issues are really tough with wireless because the transmission medium itself is unreliable.
The "Configuring QoS" chapter of the autonomous AP configuration guide
http://tools.cisco.com/squish/5aCf1
will show you how you can map priority tagging to an SSID so that in that path from radio receiver to outbound on the fastethernet interface toward the rest of the network, you can control which SSID's packets get up into the network first, but the reverse path is a different story. Because the wireless medium is half-duplex acknowledged, you can have a high priority packet out there on the radio interface trying to be beamed out to the client, and if the client isn't sending their ACK or what have you, it's going to sit and retry until its 63 retries are done before it gets out of the way to let the next high priority packet have a turn at getting transmitted out.
Once the traffic gets past the edge switch, the fact that it was at one time wireless is irrelevant. You should look at it as a general "rate limiting one VLAN's traffic over another" and check with the routing protocols or traffic shaping folks.
Sincerely,
Rollin Kibbe
Network Management Systems Team

Configuring rate-limit in switch 6500

Good morning gentlemen
Consider a 6509E (supervisor 720 3B) switch with many interface VLANs configured, one of each related to each customer. Each interface VLAN had configured a rate-limit input and output configured representing the maximum bandwidth permitted for the customer.
I could configured that way using the old IOS s72033-ipservicesk9_wan-mz.122-18.SXF7.
Last weekend I had to upgrade that IOS to s72033-ipservicesk9_wan-mz.122-33.SXJ7. All rate-limits in VLAN interfaces disappeared, probably not supported in this new version.
Now, what's you recommendation to perform the same in this IOS version?...I only found the policy-map/service-policy way.
Follow my questions:
1 - "mls qos" is globally disabled. Should I configure globally or by interface VLAN?... Expected any impact?
I believe that only need "police" for QOS. No need for any other kind of QOS.
2 - Should I enable "mls qos vlan-based" for each physical layer 2 port connected to that switch related to each interface vlan with police?
Expected only one physical port (or port-channel) for each customer (and each VLAN) connected to a switch.
Thank you and regards
Christian

Interesting that I have just upgraded the IOS to the last version 12 release.
I think that for the reason that we are facing high CPU usage for "IP Input" process, something related to mls/cef is not tunned.
Anyone has any idea regarding the configuration presented?
Regards
Christian

Rate-limit Burst explanation

Hi All - I need your help to understand the Burst value in the Rate-Limit
Example: rate-limit input access-group 101 20000000 24000 32000
I understand the above configuration limit the traffic to 20Mbps. How to calculate the Burst-Normal (as per example above 24000 Bytes) and Burst-Max(as per above example 32000 Bytes). What is the logic for arriving the Burst-Normal & Burst-Max?
Thanks in advance
SAIRAM

Hi Sairam,
below are definitions of few terms which are involved here
CIR : committed information rate, in bits per second, defines the rate defined in the traffic contract.
Tc : Time interval,measured in miliseconds, over which the committed burst (Bc) can be sent.
Bc : Committed burst size,measured in bits. This is the amount of traffic that can be sent over the interval Tc.
Be : Excess burst size, in bits. This is number of bits beyond Bc that can sent after a period of inactivity.
Formula to calculate Bc is
Bc = CIR*Tc
Now to understand Bc and Tc, say suppose you have applied 20mbps rate-limit on a 100mbps fastethernet link. Now link can send data (bits) with clock-rate only which is 100mbps so to achieve 20mbps rate on that link router needs to send traffic for 1/5th of a sec and remain idle for 4/5th of a second. 1/5th of sec is 200 msec. If router will send traffic for 200msec and not sending traffic for next 800msec, it can achieve rate of 20mbps but a packet arrived at 199th sec will need to wait for 800msec and this will add unnecessary latency to the packet. To avoid this, router sends few bits for short duration and then does not send for some duration. For the period it sends traffic is called Tc value. and the number of bytes it can send during that interval is called Bc value. So CIR = Bc/Tc (bits per interval).
Now we dont have option to configure Tc but we can configure CIR and Bc, and Tc will automatically be calculated. If we do not configure Bc then router takes default Tc of 125ms and calculates the Bc.
What value to choose for Bc
If we configure Bc too large then Tc will go high for same CIR and this may cause delay or jitter for delay sensitive traffic. For delay sensitive traffic cisco recommends to have Tc 10ms or less.
If i calculate Tc in the given example, it is coming as 9.6ms which is close to 10ms that is why Bc is set as 24000.
Tc = Bc/CIR
= 24000(bytes)/20000000(bits/sec)
= 192000(bits)/20000(bits/ms)
= 192/20
= 9.6 msec
Now Be is to give extra bandwidth for small interval(Tc) to cater some bursty traffic. Assume there is a bucket which gets filled with Bc amount of token in every Tc interval and router can send traffic if there is sufficient amount of token available in the bucket, equal to the packet size. After forwarding packet router reduces same amount of token from the bucket. Size of bucket is also equal to Bc which means if there is no traffic for Tc interval, bucket can not hold more token. Be is to increase the size of bucket to (Bc + Be). Now in every Tc interval bucket will be filled with Bc token and if there is a period of inactivity then in next interval bucket can be filled with extra Bc amount of token till it reaches to (Bc + Be) and if there is any bursty traffic (more than Bc) same can be adjusted. So for a very small period router may send traffic with more rate (higher than CIR, since sending Bc+Be in Tc interval) but over a period does not cross CIR.
You can also use below "Ask the expert" event for QoS to further queries related to QoS.
https://supportforums.cisco.com/discussion/12259571/ask-expert-quality-service-qos-cisco-ios-routers
Please dont forget to rate post if it has been helpful.
Regards,
Akash

Prevalence between service policy and rate limit

Hi,
I have a question, on the wan interface on my router I have configured two QoS configuration: one is based on rate-limit pointing to a an specified traffic but also I have a configuration with a service policy that include the same traffic with a restriction of bandwidth . I do not know what policy has prevalence if the service policy or the rate limit.
Regards.

Hi Rajan ,
Thanks for teh reply.
I'm but confused with your answer....
We have SRM 5 implemented at our place and I see that service carts created in the system using the link "ORDER" when converted to PO's in Sourcing create Purchase orders with HIERARCHY structure i.e. 1 header and 1 item(with the actual service line) but when they are replicated to ECC,we have done an enheancement to create LIMIT PO's for service orders.
Hence I wanted to know when do we need to create SERVICE HIRERACHY based PO's in SRM and when we need to create LIMIT PO's directly in SRM?
Also I understand that in SRM,for limit PO's,when the PO item is deleted in PROCESS PO trasnctions,the items are not returned back to sourcing.We dont want this to happen for all types of PO's(both material and Service).We want that when a PO item is deleted,the item should return back to sourcing.
But other then above functionality,what are the advantages of creating SERVICE based HIERARHCY PO's v/s LIMIT PO's in SRM?
Please advise.
Any inputs from Experts on this forum will be appreciated.
Thanks in advance.

3750X rate-limit (QoS)

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