Need advise about QoS for leased fiber line.

[Rahman_Duran]

Hi,

We have a remote campus (Y) that is connected to central campus (X) via 30 mbit/s leased fiber. We have S4 as router at X campus and X460-G2 at Y campus. We use static routing and the point to point VLAN is 139.

As we have 30 mbit/s line, ISP company is dropping packets that exceeds 30 mbit/s. Mostly it is download trafffic for campus Y (X ---> Y) that is egressing S4 and ingressing X460-G2. This is having negative effect on our internal services like VoIP, internal web applications etc. So is there any way to tell X460-G2 that even the port is showing 1G fiber in it, it is actually a 30 mbit/s connection and just make the given IP subnets (for internal services) have precedence? We don't care if campus Y has a laggy internet connection when they fill 30mbit/s. But we want to make sure internal services not effected.

Is this possible?

Regards

Rahman

[EtherMAN]

Are the internal voip and critical services on a different subnet than the traffic you wish to give priority to? Can you run multiple vlans across the 30 Mbs link?

[Rahman_Duran]

No, ISP only allows one VLAN over the line which is VLAN 139. So we use X460-G2 as the router/core switch for campus Y. There are multiple VLANs at campus Y that termineates on X460-G2.

VLAN 101 is VOIP vlan and has two IP addresses (10.120.101.10 and 10.120.101.11) that communicate with campus X over VLAN 139. I need to make sure these have priority so no packets loss even the 30 mbit/s line is full.

We also have some local web server IPs at campus X. I need to make sure that traffic coming from these IPs have priority so no packet loss for these also.

So what are my best options? It seems I need to shape/limit traffic before it leaves S4 at campus X? Because we have no control over ISP switches and they can drop packets randomly.

Regards,

Rahman