QOS on Layer 2 Point to Point Fiber?

[ahmad82pkn]

Hi, We have a Layer 2 Point to Point Fiber between Two Data Center.

Our complete data traffic between both Data centers travel over it along with our Avaya traffic between Call managers and AES located in Both data center.

We are getting reports from Avaya team that their Call manager is losing connectivity with AES servers across the data center over the private line.

Is it possible to implement some QOS on this P2P L2 link on routers? why i am asking is that there is no congestion on the links at all its 100Mbps and always remain 30Mbps MAX.

But may be some burst nature data causing delay for Avaya packets?

is there any gain in applying QOS on router? what benefit will i get? Router will send Avaya packet first on wire?. is that the benefit i will get? what else.

Please suggest.

[Reza Sharifi]

Hi,

If the link is 100Mb and you see traffic at 30Mb, than it does not appear you have any network congestion. Have you figured out that the issue is actually are the AES servers? What is AES and are you able to do any testing without the servers?

HTH

[ahmad82pkn]

AES are basically some Avaya enablement services Server. And Avaya Call Manager connect to it on TCP port xxx (dont know exactly) and this TCP session drops.

Avaya Tech Always says check your QOS Setting, whereas we dont have QOS configured on this Private Line OR Routers.

These are 7204VXR NPE-G2 routers at both end connecting the Private Line.

so i was just curious how QOS can help me in this scenario even if i apply it, as we do have QOS in our MPLS Cloud on different LEG but there it helps as we have Queues at Carrier Cloud and they can Prioritize Voice or anything we send a P1 TAG, but in case of Private line? any benefits?.

[Joseph W. Doherty]

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Posting

It's certainly possible, as you mention, you might have short term traffic bursts that will be adverse to very time sensitive traffic, such as VoIP.  Something like microbursts are not generally visible to typical bandwidth monitoring.

If that's happening, QoS might, indeed, be a solution.

I'm not too sure about application of router QoS on a L2 only link.  What's hosting the two sides of the link now?  Reason I ask, most managed switches offer some QoS support, often enough to protect VoIP.