Do I need a switch with VLAN and QoS?|
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Posted by just bob on June 15, 2009, 5:55 pm
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somehow prioritize VoIP traffic on a LAN. Basically San Francisco and Los Angeles Springs each have an Avaya IP Office PBX which transfers calls over VoIP. We have no VoIP phones or other devices, just these PBX's supporting VoIP to each other. Previously these locations were connected via a Point-to-Point circuit with gobs of extra bandwidth, and at my busy SF location I had the PBX on a sub network away from all other traffic. But that is going away so now we need to prioritize the local traffic. The new MPLS circuit will prioritize across the WAN but locally I need to do something, too. Let me know if you have any ideas. I'm hoping a very inexpensive switch with basic management will do this for me. Thanks! | |||||||||||||
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Posted by Artie Lange on June 15, 2009, 6:38 pm
Please log in for more thread options Very nice phone system >
> Previously these locations were connected via a Point-to-Point circuit with > gobs of extra bandwidth, and at my busy SF location I had the PBX on a sub > network away from all other traffic. But that is going away so now we need > to prioritize the local traffic. The new MPLS circuit will prioritize across > the WAN but locally I need to do something, too. > > Let me know if you have any ideas. I'm hoping a very inexpensive switch with > basic management will do this for me. > > Thanks! > > About any Cisco or HP switch should suffice. This should get you started as this is the smallest switch to look into depending on bandwidth needs http://www.cisco.com/en/US/products/ps6406/index.html | |||||||||||||
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Posted by Thrill5 on June 15, 2009, 7:24 pm
Please log in for more thread options QoS is a layer 3 method of prioritizing IP traffic so that lower priority
traffic is dropped before higher priority traffic when there is conjestion on a link between routers. A switch is a layer 2 device which does not apply QoS but it can be used to mark the priority of the traffic. In your case you need a router that does QoS at the two locations where the VoIP traffic is. You will need to mark the traffic appropriately so that you and your MPLS provider use the same QoS markings and that they mean the same thing. You will also need to make sure that the VoIP traffic is prioritized on your outbound links to the MPLS cloud, so that your router is dropping the non-VoIP traffic before other traffic. Once in the MPLS cloud your provider will honor the markings and also drop non-VoIP traffic first. I would suggest you get some assistance in putting this together. The vendor that supports your Avaya system is a good place to look for help as they will be very familier with QoS and how to implement it correctly. > just bob wrote:
>> I think I finally need a real managed switch with VLAN and QoS. I need to
>> somehow prioritize VoIP traffic on a LAN. >> >> Basically San Francisco and Los Angeles Springs each have an Avaya IP >> Office PBX which transfers calls over VoIP. We have no VoIP phones or >> other devices, just these PBX's supporting VoIP to each other. >
> Very nice phone system > >>
>> Previously these locations were connected via a Point-to-Point circuit >> with gobs of extra bandwidth, and at my busy SF location I had the PBX on >> a sub network away from all other traffic. But that is going away so now >> we need to prioritize the local traffic. The new MPLS circuit will >> prioritize across the WAN but locally I need to do something, too. >> >> Let me know if you have any ideas. I'm hoping a very inexpensive switch >> with basic management will do this for me. >> >> Thanks! >
> About any Cisco or HP switch should suffice. > > This should get you started as this is the smallest switch to look into > depending on bandwidth needs > > http://www.cisco.com/en/US/products/ps6406/index.html | |||||||||||||
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Posted by Stephen on June 16, 2009, 4:53 pm
Please log in for more thread options wrote:
>I think I finally need a real managed switch with VLAN and QoS. I need to
QoS only has an effect when you have congestion.
>somehow prioritize VoIP traffic on a LAN. > >Basically San Francisco and Los Angeles Springs each have an Avaya IP Office >PBX which transfers calls over VoIP. We have no VoIP phones or other >devices, just these PBX's supporting VoIP to each other. > If the PBX local interfaces are on their own LAN interfaces, then the traffic level will be sub 100 Kbps per active call - so room for 1000 calls on a 100 Mbps port...... >Previously these locations were connected via a Point-to-Point circuit with
The main thing is to make sure the way you mark your traffic is
>gobs of extra bandwidth, and at my busy SF location I had the PBX on a sub >network away from all other traffic. But that is going away so now we need >to prioritize the local traffic. The new MPLS circuit will prioritize across >the WAN but locally I need to do something, too. > compatible with the MPLS service (and that you have those MPLS options in your service, that they are turned on and working). >Let me know if you have any ideas. I'm hoping a very inexpensive switch with
This implies your MPLS access link is Ethernet based?
>basic management will do this for me. > you havent really given enough detail for any of us to suggest a "fire and forget" network design. A lot will depend on what kind of MPLS service you have, the QoS you get, your traffic profile and so on. I suspect a layer 3 switch that can remark the traffic going into the WAN is a good starting point if your existing equipment cannot handle that - but there are limitations also note if you have a "rate limited" WAN interface feeding into the MPLS (say a 10 Mbps pipe, but you can only use 4 Mbps), then most switches cannot combine QoS prioritisation and rate limiting on the same port - for that you may need a router. I like Cat 3560s / 3750s which are pretty flexible - but they do not have resilience options such as dual power feeds...... They can rate limit is 10% port speed steps and still do QoS within that. >Thanks!
--
> Regards stephen_hope@xyzworld.com - replace xyz with ntl | |||||||||||||
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Posted by jrguent@gmail.com on June 18, 2009, 3:14 pm
Please log in for more thread options > wrote:
> > >I think I finally need a real managed switch with VLAN and QoS. I need t=
o
> >somehow prioritize VoIP traffic on a LAN.
>
> >Basically San Francisco and Los Angeles Springs each have an Avaya IP Of=
fice
> >PBX which transfers calls over VoIP. We have no VoIP phones or other
> >devices, just these PBX's supporting VoIP to each other. >
> QoS only has an effect when you have congestion. > > If the PBX local interfaces are on their own LAN interfaces, then the > traffic level will be sub 100 Kbps per active call - so room for 1000 > calls on a 100 Mbps port...... > > >Previously these locations were connected via a Point-to-Point circuit w=
ith
> >gobs of extra bandwidth, and at my busy SF location I had the PBX on a s=
ub
> >network away from all other traffic. But that is going away so now we ne=
ed
> >to prioritize the local traffic. The new MPLS circuit will prioritize ac=
ross
> >the WAN but locally I need to do something, too.
>
> The main thing is to make sure the way you mark your traffic is > compatible with the MPLS service (and that you have those MPLS options > in your service, that they are turned on and working). > > >Let me know if you have any ideas. I'm hoping a very inexpensive switch =
with
> >basic management will do this for me.
>
> This implies your MPLS access link is Ethernet based? > > you havent really given enough detail for any of us to suggest a "fire > and forget" network design. > > A lot will depend on what kind of MPLS service you have, the QoS you > get, your traffic profile and so on. > > I suspect a layer 3 switch that can remark the traffic going into the > WAN is a good starting point if your existing equipment cannot handle > that - but there are limitations > > also note if you have a "rate limited" WAN interface feeding into the > MPLS (say a 10 Mbps pipe, but you can only use 4 Mbps), then most > switches cannot combine QoS prioritisation and rate limiting on the > same port - for that you may need a router. > > I like Cat 3560s / 3750s which are pretty flexible - but they do not > have resilience options such as dual power feeds...... > > They can rate limit is 10% port speed steps and still do QoS within > that. > > >Thanks!
>
> -- > Regards > > stephen_h...@xyzworld.com - replace xyz with ntl Incidentally, I am using Catalyst 3750 switches in conjunction with external RPS (RPS 675) which can act as a redundant power supply if you were to lose a Power supply on one switch. | |||||||||||||
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> somehow prioritize VoIP traffic on a LAN.
>
> Basically San Francisco and Los Angeles Springs each have an Avaya IP Office
> PBX which transfers calls over VoIP. We have no VoIP phones or other
> devices, just these PBX's supporting VoIP to each other.