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Need advise about QoS for leased fiber line.

Need advise about QoS for leased fiber line.

Rahman_Duran
Contributor II
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

6 REPLIES 6

EtherMAN
Contributor III
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?

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
GTM-P2G8KFN