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Forum Discussion
Switching affected by routing uplink
hi, I have a situation that I can not make sense out of. Netgear 10G switch is connected to a Cisco L3 Linksys switch at 1Gbps speed, there is only one VLAN configured on Netgear, two hosts are connected to Netgear switch, default gateway IP of the VLAN is on Cisco L3 linksys switch, Netgear learned MAC addresses of both hosts fine, both hosts can ping each other fine, however the connection speed between the two hosts is less than 1Gbps even host OS (Ubuntu) says the link speed is 10G, even weird thing is when I disconnect the link between Linksys and Netgear, connectivity between the two hosts would lost, it seems that even the two hosts are connected to Netgear in the same VLAN, the IP connectivity between the hosts is still routed via Linksys L3 switch.
I have limited networking knowledge, but the above behavior does not make sense to me at all, what could be the reason behand this behavior?
5 Replies
Hi oldcreek,
Welcome to the community!
Could you please answer my quesitons as below for further analysis this problem?1. What's the IP address and netmask for two Hosts?
2. When disconnect Netgear switch and Cisco switch, two Hosts cannot ping each other?
As I think maybe two Host set differnt subnet mask, it cause they don't think these two Host in same subnet.
Regards,
EricZ
NETGEAR employeeI have a confirmed bug that has been passed from L3 support to the software developers to fix that is very similar to this. The switch is a M4300-24X24F with the latest firmware.
My setup is a bit more complicated. I have five VLANs using policy based routing to set a different gateway for each VLAN but I get a similar problem. Any equpment attached to the switch can directly connect to any other equipment if it is in a different VLAN but if the equipment is in the same VLAN the traffic gets sent to the default gateway (which it clearly shouldn't as the equipment is connected to the switch and the devices appear in the ARP table).
Hi TCan,
The problem you said should be worked as design, as all of traffic Inter-VLAN or Intra-VLAN match to PBR policy, so the traffic was redirected to router.
If you want intra-VLAN traffic not forwarding to router, you should config IP ACL to exclude these traffic, make sure the ACL only match the traffic that belong to Inter-VLAN.
So I think it not same as this problem.
Hi EricZ
I have to disagree with what you have said. The PBR I have used only sets a default gateway - 'set ip default next-hop x.x.x.x'. It is applied to all VLANs but should only have an effect when the traffic isn't local to the switch otherwise the traffic should be routed locally, NOT passed to the default gateway. Its a default gateway - by definition that is where to send traffic that isn't local. The PBR works correctly for inter-VLAN traffic, nothing gets sent to the default gateway, it is only intra-VLAN traffic that incorrectly gets sent to the default gateway. As I said, this has been confirmed as a bug and is awaiting a fix from your software developers.
Anyway, this isn't about my issue but I mentioned it because the symptom oldcreek describes is very similar - intra-VLAN traffic incorrectly being sent to the default gateway. The cause may be different and you have suggested he checks his subnetting. Without furhter input from oldcreek we won't know!
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