To configure Qos and Cos on Routers and Switches
I need some assistance with configuring Qos and Cos on our productions Routers and Switches. I am newbie to Quality of service , Class of service, marking etc. but read about 'em recently. Although i it would be better to receive advise from experienced personnel.
Current running config, is attached herewith and let me know how this can be implemented. AutoQos ? i heard it can screw up in rare case due to depending on NBAR. CBWFQ or LLQ for marking? I was thinking about activating Qos through AutoQos and fine tune it later. I heard router monitors traffic continioulsy for 3 days and create qos setting based on it.
You will see there is a Qos already configured for VoIP on router (not me) but i doubt if given bandwidth 25% is right or if its applied on both inbound and outbound.
I understand that Qos needs lots of planning, banging couple of commands only takes few mins. If any clear documentation is available that can be helpful too.
router-2821.txt
switch-core1.txt
Current running config, is attached herewith and let me know how this can be implemented. AutoQos ? i heard it can screw up in rare case due to depending on NBAR. CBWFQ or LLQ for marking? I was thinking about activating Qos through AutoQos and fine tune it later. I heard router monitors traffic continioulsy for 3 days and create qos setting based on it.
You will see there is a Qos already configured for VoIP on router (not me) but i doubt if given bandwidth 25% is right or if its applied on both inbound and outbound.
I understand that Qos needs lots of planning, banging couple of commands only takes few mins. If any clear documentation is available that can be helpful too.
router-2821.txt
switch-core1.txt
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"Switches doesnt have Cos , thats one important thing i have to enable. few examples would be helpful. Or can i do Auto Qos on switches too or no?(except cores)"
Setting CoS on your switches is not going to help the WAN congestion issues. It will only allow you to mark traffic at the switch. The router will still need to limit and prioritize the traffic.
If you are seeing issues within your switched network between calls then yeah we can set something up on your switches.
As for the choppy calls it looks like you running SDM on your routers if so check out the Monitoring section of SDM and you can get a good view of how QoS is handling and preforming along with your bandwidth utilization for your WAN links.
"I thought all we need to do is AUTO QOS VOIP OR AUTO QOS DISCOVERY (for data)"
AUTO QOS DISCOVERY starts monitoring the traffic going through the interface and logs it. AUTO QOS VOIP enables and configures QoS on that interface based on what discovery found.
Setting CoS on your switches is not going to help the WAN congestion issues. It will only allow you to mark traffic at the switch. The router will still need to limit and prioritize the traffic.
If you are seeing issues within your switched network between calls then yeah we can set something up on your switches.
As for the choppy calls it looks like you running SDM on your routers if so check out the Monitoring section of SDM and you can get a good view of how QoS is handling and preforming along with your bandwidth utilization for your WAN links.
"I thought all we need to do is AUTO QOS VOIP OR AUTO QOS DISCOVERY (for data)"
AUTO QOS DISCOVERY starts monitoring the traffic going through the interface and logs it. AUTO QOS VOIP enables and configures QoS on that interface based on what discovery found.
ASKER
I agree that Layer 2 Markings are to benefit the max. out of Qos. Layer 3 could easily identify the markings and queue accordingly.
We need Cos setup on our Access switches for sure. If you would please give some examples like for VoIP and Apps like SQL Server, http,ftp. etc.
For Auto Qos, what would be the ideal bandwidth need to be set ? on 40 MB wan port?
We need Cos setup on our Access switches for sure. If you would please give some examples like for VoIP and Apps like SQL Server, http,ftp. etc.
For Auto Qos, what would be the ideal bandwidth need to be set ? on 40 MB wan port?
What model are your access switches?
Also, could you give me some more details on were you want to limit the different classes. Do you want them limited and prioritized on your WAN links between locations or from your core switch down on your local lan?
ASKER
Access switches are 2960's. There are 4 of 'em. FYI, there are 3 core switches (1) 3560G, (2) 2960G.
Can we limit and prioritize on WAN link as well as close end points (access switches) I heard applying CoS on core switches isnt the best practice.
tucn-access1.txt
Can we limit and prioritize on WAN link as well as close end points (access switches) I heard applying CoS on core switches isnt the best practice.
tucn-access1.txt
"Can we limit and prioritize on WAN link as well as close end points (access switches) "
I would not apply QoS policies on your core switches unless you are seeing congestion within your local LAN that you want to control. You are most likely seeing all your congestion and issues at the edge router on the WAN interface. This is were you want to apply your policies.
With a smaller network like this i suggest keeping everything simple by applying your QoS on your edge router (if your WAN link is the issue). This will allow you to better classify and prioritize your traffic.
If you must mark and priorize queus on your switches then check out this link. It gives a lot of good details on different options
http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_25_see/configuration/guide/swqos.html#wp1426811
I would not apply QoS policies on your core switches unless you are seeing congestion within your local LAN that you want to control. You are most likely seeing all your congestion and issues at the edge router on the WAN interface. This is were you want to apply your policies.
With a smaller network like this i suggest keeping everything simple by applying your QoS on your edge router (if your WAN link is the issue). This will allow you to better classify and prioritize your traffic.
If you must mark and priorize queus on your switches then check out this link. It gives a lot of good details on different options
http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_25_see/configuration/guide/swqos.html#wp1426811
ASKER
Actually i went through those cisco documents before posting this question. Quite complicated subject.
1) If setting up Auto Qos VoIP on router, what would be the ideal bandwidth for 40 MB wan port?
2) If setting up Auto Qos Access switch, what would be the ideal bandwidth ?
Can you give me step by step commands?
1) If setting up Auto Qos VoIP on router, what would be the ideal bandwidth for 40 MB wan port?
2) If setting up Auto Qos Access switch, what would be the ideal bandwidth ?
Can you give me step by step commands?
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ASKER
I am looking into this cisco document, hope this will help any future EE visitors
http://www.cisco.com/en/US/technologies/tk543/tk879/technologies_qas0900aecd8020a589.html
but in the document it doesnt say to apply autoqos discovery first .maybe that doesnt make a difference ?
http://www.cisco.com/en/US/technologies/tk543/tk879/technologies_qas0900aecd8020a589.html
but in the document it doesnt say to apply autoqos discovery first .maybe that doesnt make a difference ?
ASKER
i appreciate your opinion. I understand how complex Qos setup can be on a real production network. I am preparing for my ONT 642-845 exam. Self Study with CBTs. Like a coincidence a Qos/Cos rebuilding matter came up and was going to Hire a consulting co. for it. Initially i felt so confident with the Qos configs, but as i went deeper n deeper i found its an ocean, esp. planning.
Like you suggested we maynot have much complicated apps , network . So AutoQos will do the job.
Like you suggested we maynot have much complicated apps , network . So AutoQos will do the job.
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ASKER
I am going to check with our ISP on their support for classification and do the marking according to that. Decided not to use AutoQos but manually apply it.
ASKER
"yeah basically you setup nbar and auto-discovery on your router to monitor your traffic flows. let is sit I would say for a week so it can see all the traffic that passes during normal and peak hours. After that you enable AutoQoS and it adjust based on priority" I thought all we need to do is AUTO QOS VOIP OR AUTO QOS DISCOVERY (for data)