Traffic shapping.
Traffic shaping is a bandwidth management technique used on computer networks which delays some or all datagrams to bring them into compliance with a desired traffic profile
Junos configuration
This features is supported from Junos OS Release 10.4 and later
set class-of-service interfaces ge-2/0/8 shaping-rate 160k
paul@router# show class-of-service
interfaces {
ge-2/0/8 {
shaping-rate 8k;
}
}
Altenatively
set class-of-service traffic-control-profiles output shaping-rate 8k
set class-of-service traffic-control-profiles output shaping-rate burst-size 1k
set class-of-service interfaces ge-2/0/8 output-traffic-control-profile output
paul@router# show class-of-service
traffic-control-profiles {
output {
shaping-rate 8k burst-size 1k;
}
}
interfaces {
ge-2/0/8 {
output-traffic-control-profile output;
}
}
Verificatuion
paul@router> show interfaces extensive ge-2/0/8
Cisco ios configuration
R2#sh ver | i Software Cisco IOS Software, 7200 Software (C7200-ADVENTERPRISEK9-M), Version 12.4(24)T5, RELEASE SOFTWARE (fc3) BOOTLDR: 7200 Software (C7200-ADVENTERPRISEK9-M), Version 12.4(24)T5, RELEASE SOFTWARE (fc3)
We test with ping to see the transmission rate before traffic shaping
R2#config R2(config)#do ping 192.168.56.1 si 1500 df Type escape sequence to abort. Sending 5, 1500-byte ICMP Echos to 192.168.56.1, timeout is 2 seconds: Packet sent with the DF bit set !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 4/11/16 ms
Configuring the traffic shaping
R2(config)#interface FastEthernet0/0
R2(config-if)#traffic-shape rate ?
<8000-100000000> Target Bit Rate (bits per second)
R2(config-if)#traffic-shape rate 8000
Verification
R2(config-if)#do sh run int f0/0
Building configuration...
Current configuration : 126 bytes
!
interface FastEthernet0/0
ip address 192.168.56.66 255.255.255.0
traffic-shape rate 8000 8000 8000 1000
end
R2(config-if)#do sh traffic-shape
Interface Fa0/0
Access Target Byte Sustain Excess Interval Increment Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes) Active
- 8000 2000 8000 8000 1000 1000 -
R2(config-if)#do sh traffic-shape stat
Acc. Queue Packets Bytes Packets Bytes Shaping
I/F List Depth Delayed Delayed Active
Fa0/0 0 613 61873 0 0 no
R2(config-if)#do ping 192.168.56.1 size 1500 df
Type escape sequence to abort.
Sending 5, 1500-byte ICMP Echos to 192.168.56.1, timeout is 2 seconds:
Packet sent with the DF bit set
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/923/1984 ms
R2(config-if)#do sh traffic-sha sta
Acc. Queue Packets Bytes Packets Bytes Shaping
I/F List Depth Delayed Delayed Active
Fa0/0 0 622 69683 4 4602 no
We can see the difference between the round trip time before and after applying the shaper
Before
R2(config)#do ping 192.168.56.1 si 1500 df Type escape sequence to abort. Sending 5, 1500-byte ICMP Echos to 192.168.56.1, timeout is 2 seconds: Packet sent with the DF bit set !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 4/11/16 ms
After
R2(config-if)#do ping 192.168.56.1 size 1500 df Type escape sequence to abort. Sending 5, 1500-byte ICMP Echos to 192.168.56.1, timeout is 2 seconds: Packet sent with the DF bit set !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 4/923/1984 ms
We can use an access list to specify the traffic to be shaped
R2(config)#access-list 199 permit ip host 192.168.56.66 host 192.168.56.1 R2(config)#interface FastEthernet0/0 R2(config-if)#traffic-shape group 199 8000 mix of shaping with and without access lists prohibited R2(config-if)#do sh run interface FastEthernet0/0 Building configuration... Current configuration : 126 bytes ! interface FastEthernet0/0 ip address 192.168.56.66 255.255.255.0 traffic-shape rate 8000 8000 8000 1000 end
We get an error because we already applied another traffic shaper, we have to remove it before applying another
R2(config-if)#no traffic-shape rate 8000 R2(config-if)#do sh run interface FastEthernet0/0 Building configuration... Current configuration : 86 bytes ! interface FastEthernet0/0 ip address 192.168.56.66 255.255.255.0 end R2(config-if)#traffic-shape group 199 8000 R2(config-if)#do sh run interface FastEthernet0/0 Building configuration... Current configuration : 131 bytes ! interface FastEthernet0/0 ip address 192.168.56.66 255.255.255.0 traffic-shape group 199 8000 8000 8000 1000 end R2(config-if)#end
Verification
We test by ping to the ip 192.168.56.1 which is matched by the access list
R2#ping 192.168.56.1 size 1500 df
Type escape sequence to abort.
Sending 5, 1500-byte ICMP Echos to 192.168.56.1, timeout is 2 seconds:
Packet sent with the DF bit set
!!.!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 8/751/1988 ms
R2#
R2#sh traffic-shape stat
Acc. Queue Packets Bytes Packets Bytes Shaping
I/F List Depth Delayed Delayed Active
Fa0/0 199 0 5 7570 3 4542 no
We can see the shaper is affecting the traffic to the point of causing packet loss, now we can test to ping an ip that wont be matched by the access-list
R2#ping 192.168.56.63 size 1500 df
Type escape sequence to abort.
Sending 5, 1500-byte ICMP Echos to 192.168.56.63, timeout is 2 seconds:
Packet sent with the DF bit set
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/24/36 ms
R2#sh traffic-shape stat
Acc. Queue Packets Bytes Packets Bytes Shaping
I/F List Depth Delayed Delayed Active
Fa0/0 199 0 5 7570 3 4542 no
We can see there is no increase in the number of delayed bytes and the round trip time is less.
For ios version 15 we use modular QoS to apply traffic shaping. The Modular QoS CLI is a CLI structure that allows users to create traffic polices and attach these polices to interfaces. A traffic policy contains a traffic class and one or more QoS features. A traffic class is used to classify traffic, while the QoS features in the traffic policy determine how to treat the classified traffic.
pycon-ios#sh ver | i Software
Cisco IOS Software, 7200 Software (C7200-ADVIPSERVICESK9-M), Version 15.2(4)S5, RELEASE SOFTWARE (fc1)
BOOTLDR: 7200 Software (C7200-ADVIPSERVICESK9-M), Version 15.2(4)S5, RELEASE SOFTWARE (fc1)
pycon-ios#config)
pycon-ios(config)#class-map shape
pycon-ios(config-cmap)#match any
pycon-ios(config-cmap)#policy-map shape
pycon-ios(config-pmap)#class shape
pycon-ios(config-pmap-c)#shape average ?
<8000-800000000> Target Bit Rate (bits/sec). (postfix k, m, g optional;
decimal point allowed)
percent % of interface bandwidth for Committed information rate
pycon-ios(config-pmap-c)#shape average 8k
Verification
pycon-ios(config-pmap-c)#int f0/0
pycon-ios(config-if)#do ping 192.168.56.66 df size 1500
Type escape sequence to abort.
Sending 5, 1500-byte ICMP Echos to 192.168.56.66, timeout is 2 seconds:
Packet sent with the DF bit set
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/32/60 ms
pycon-ios(config-if)#service-policy output shape
pycon-ios(config-if)#do sh run int f0/0
Building configuration...
Current configuration : 151 bytes
!
interface FastEthernet0/0
description management
ip address 192.168.56.63 255.255.255.0
service-policy output shape
end
pycon-ios(config-if)#do ping 192.168.56.66 df si 1500
Type escape sequence to abort.
Sending 5, 1500-byte ICMP Echos to 192.168.56.66, timeout is 2 seconds:
Packet sent with the DF bit set
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 68/1269/1720 ms
pycon-ios(config-if)#
pycon-ios(config-if)#end
pycon-ios#sh policy-map shape
Policy Map shape
Class shape
Average Rate Traffic Shaping
cir 8000 (bps)
pycon-ios#sh class-map shape
Class Map match-all shape (id 1)
Match any
pycon-ios#sh policy-map shape class shape
Class shape
Average Rate Traffic Shaping
cir 8000 (bps)
pycon-ios#sh policy-map interface f0/0 output class shape
FastEthernet0/0
Service-policy output: shape
Class-map: shape (match-all)
40 packets, 18463 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) 40/18463
shape (average) cir 8000, bc 32, be 32
target shape rate 8000
Cisco iosxr configuration
RP/0/0/CPU0:pycon-iosxr(config)#show conf
Tue Jan 21 07:36:06.774 UTC
Building configuration...
!! IOS XR Configuration 5.3.0
!
class-map match-any shape-class
match protocol ipv4
end-class-map
!
!
policy-map shape-map
class shape
shape average 8 kbps
!
class class-default
!
end-policy-map
!
interface GigabitEthernet0/0/0/0.600
service-policy output shape-map