11-10-2018 03:49 AM - edited 03-08-2019 04:35 PM
Hello,
How to determine that a type of traffic should be assigned to a particular class of service? Are there any rules on the subject?
Voice
Realtime interactice
Multimedia conferencing
Broadcast Video
Multimedia streaming
Signaling
Network Control
Network management
Transactionnal data
Bulk data
Best effort
scavenger
Thank you. Christophe.
11-10-2018 04:20 AM
Hello,
not sure what you are asking. Auto QoS creates classes, otherwise you are free to create any class and assign any sort of traffic. Are are you looking for the specific traffic for the classes you mentioned ?
11-10-2018 05:04 AM
Hello Georg,
I want to create my own classes. and although I am free to assign traffic to a given class, certain types of traffic must, in my opinion, go into very specific classes. True or false? for example :
Voice traffic should be in voice classe
network management trafic should be in network management classe
http trafic should be in bulk data class
and so on
I mean what is scavenger traffic? what is bulk traffic ?
if I look at all the traffic that passes through the network (e. g. with nbar) how can I decide which type of traffic should be associated with which class?
Christophe.
11-10-2018 05:13 AM
11-10-2018 05:14 AM
Hello,
auto qos handles a hierarchical dscp/af/cs scheme, meaning the highest values go into the highest class. Scavenger traffic handles anything with cs1. In the end is it kind of arbitrary, and while in most situations, auto qos is probably sufficient, you might be better off creating your own policies...
11-10-2018 05:10 AM
Hello
looks like you’ve hit the full recommended 11 class map allocation with that lot excluding the class class-default
No rules as such but when your expecting congestion you would need to make sure your real time traffic such as voice-video services don’t incur to much latency or jitter so it’s services begin to fail - So for those you would probably want to prioritise this traffic with LLQ And with the rest share the remainder bw between your most- least preffered traffic
least preffered being your don’t care class ie- best effort - class class default
However this would not include your network control - management traffic as you would not want your igp or monitoring services to be included in the don’t care class so they would need some of their own bw allocation
Please review this best pratice document to give you a very understanding on how to plan your qos
11-10-2018 09:38 AM
Hello,
Not sure to understand all what you say Georg & Paul (sorry I am French and can make mistakes in translation or undertsanding). I agree that autoqos works in most situations but autoqos only trusts cos/dscp values. Looking at http traffic (wireshark capture) i note that it is taggued dscp 0. So this kind of trafic is assigned to best-effort class and i would like to assigned it to bulk-data class.
Christophe.
11-10-2018 09:59 AM
Hello
Just because they are default its doesn't mean it stays that way, the beauty of qos is you can manipulate it to your liking.
Take http or https traffic, you can classify and mark this traffic to any dhcp values you like and/or prioritize/police or allocate minimum BW to it using NBAR as it exits your network
example
class-map match-any WEB
match protocol http
match protocol secure-http
policy-map child
class WEB
set ip dscp 21
bandwidth 10
class class-default
fair-queue
policy-map parent
class class-default
shape average 10240000
service-policy child
int x/x
description wan interface
service-policy output parent
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