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In which router should LLQ etc feature be used in enterprise network ?

eigrpy
Enthusiast
Enthusiast

Hi We have big bandwidth in network. But some people still suggest to use LLQ or other QoS features for our VoIP phone, which are needed to call outside phone. How do you think the issue ? If so, I think the Qos features should be used in edge router or bottleneck of the network. Do you think so ? Thank you 

2 Accepted Solutions

Accepted Solutions

Nagendra Kumar Nainar
Cisco Employee
Cisco Employee

But some people still suggest to use LLQ or other QoS features for our VoIP phone, which are needed to call outside phone. How do you think the issue ?

<Nagendra> Normally for VoIP traffic, one of the requirement is to have end-to-end latency within 150 msec. If the BW is huge and all traffic are following FIFO, a huge scavanger/non-critical traffic might introduce delay to VoIP traffic. This might be one of the reason for such suggestion.

 

If so, I think the Qos features should be used in edge router or bottleneck of the network. Do you think so ?

<Nagendra> I would think it depends on your network. If you have any internal link that posisbly will be congested (during business hours or peak hours), you could consider it as a candidate position to apply QoS. 

View solution in original post

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

If your "big" is such that there's no over subscription, then you don't need QoS.

If there is over subscription, then transient congestion is possible, and QoS is used to guarantee service for some traffic, such as VoIP.

Even with over subscription it's possible your traffic won't create transient congestion, or if any is formed, it's not adverse to the needs of your critical traffic.  Again, the operative word is guarantee service.

View solution in original post

3 Replies 3

Nagendra Kumar Nainar
Cisco Employee
Cisco Employee

But some people still suggest to use LLQ or other QoS features for our VoIP phone, which are needed to call outside phone. How do you think the issue ?

<Nagendra> Normally for VoIP traffic, one of the requirement is to have end-to-end latency within 150 msec. If the BW is huge and all traffic are following FIFO, a huge scavanger/non-critical traffic might introduce delay to VoIP traffic. This might be one of the reason for such suggestion.

 

If so, I think the Qos features should be used in edge router or bottleneck of the network. Do you think so ?

<Nagendra> I would think it depends on your network. If you have any internal link that posisbly will be congested (during business hours or peak hours), you could consider it as a candidate position to apply QoS. 

So, the location of LLQ configuration should be in bottleneck of the network, right ? 

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

If your "big" is such that there's no over subscription, then you don't need QoS.

If there is over subscription, then transient congestion is possible, and QoS is used to guarantee service for some traffic, such as VoIP.

Even with over subscription it's possible your traffic won't create transient congestion, or if any is formed, it's not adverse to the needs of your critical traffic.  Again, the operative word is guarantee service.

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