Cisco IOS: Basic QoS

Configure Basic QoS through MPLS. NOTE: I forgot to put 'mls qos trust dscp' on the ingress port.


Config below:

class-map match-all VLAN88
match vlan 88
class-map match-all VIDEO
match ip precedence 4
class-map match-all 1441AVOCADO
match vlan 148
class-map match-all VOICE
match ip precedence 7
!
!
policy-map PRI
description TRAFFIC PRIORITIZATION
class VOICE priority
class VIDEO bandwidth percent 20
class class-default random-detect bandwidth percent 80
policy-map SHAPE-OUT
description THROTTLE DOWN AND PRIORITIZE TRAFFIC
class VLAN88
service-policy PRI
shape average 10000000
class 1441AVOCADO
shape average 10000000
service-policy PRI

!
interface GigabitEthernet1/1/1
description OPTEMAN ES PORT
switchport mode trunk
speed 1000
service-policy output SHAPE-OUT

Category:

Science & Technology

Tags:

• Cisco
• IOS
• QoS
• MPLS

[HBvD]

Hi,

thanks for the instruction! One question, you say the de precedence value (I assume you mean the COS value) for voice is 7, shoudn't this me 5?

If so, no VoIP traffic will be applied to the VOCIE class-map and neighter will be placed in queue 2 by default?

Thanks!

Harald

[gamorm]

Yes default is 5, however on my network certain voice traffic is tagged to precedence 7.

[12warsan]

BATMAN IS THE BEST

[stiiiiiillfellil]

Thx 4 the vid

[goheer786]

Excellent video!

How can prioritise voice and then video with cos values on3550? I think it's cos 3or 5 to use, is that right? And how can I remark all other traffic to 0. So voice always gets priority?

[NajCoLabs]

Good one!!!

[gabrielinho89]

Hello. Which program did you use for this Basic QoS Tutorial?

[Whiteice27]

Voice traffic (RTP Protocol) commonly uses DSCP EF, ToS of 5, not 7. While voice traffic can be placed in tos 7, its not recommended as such traffic is fifo when the link comes congested with tos 7 traffic and network control/voice traffic compete for the bandwidth if that issue ever arises it can cause outages

7 is used by network control traffic which includes link layer and IP routing protocol keepalives.

ToS 6 is Internetwork Control traffic which routing protocols traffic use by default.

[Blackzjeh]

You forgot to ''copy running-config startup-config''  :)

[DSCP46]

Its also recommended to limit the priority queue to 33% of shape speed by Cisco. If more than 33% is required, Shaped Bandwidth of the link needs to be increased along with the WAN service.