I have a weird problem with a Cisco 2901 connected toi a SG300-28 switch.
Every 24 hours the router loses connection with the switch, meaning you can not ping the router anymore.
You can ping any other device in the network (PC's, servers, other cisco routers) .
The weird thing is that on the switch I can see the router (CDP neighbors) and the timer is refreshed.
The other weird thing is that when I try to ping the 2901 router an arp entry is created on the PC's or server.
So also ARP resolution works, but not IP.
I have changed the cable, tried 3 ports on the SG300 switch and changed the port on the 2901 (was gig0/0 now gig0/1)
But the problem stays the same.
I am not that familiar with the SG300 switch (more familiar with the IOS switches) but all the ports are in default configuration.
I also tried to change the default port settings (lower speed, different template) nothing works.
Has anyone seen this problem with SG300 switches and Cisco routers?
Hello Mr. huizinga,
Thank you for your question.
However, the Small Business Support Community is limited to Cisco Small Business Products and the 2911 router is an Enterprise level product.
You might consider to ask this question at Enterprise forum to get a better response.
Cisco Small Business Community Engineer
Well , apparently there are more devices that have this problem.
We saw now that PC's and servers that have randomly no access anymore, and only a reboot of the switch solves the problem.
Seems to me that the switch is not good.
I have upgraded to the latest firmware, but problem remains.
Maybe we have to send the switch back
The switch should not have any interop issues with the 2901. Can you provide some LAN details?
Could you also provide some general details about the switch communication with the router and connected devices?
Please rate helpful posts
About your questions:
Most of the problem is related to the connectivity with the 2901, but sometimes also PC's, or servers or out Cisco routers. And one time I had seen that I don't have access to the IP of the switch itself, so no reboot. Customer did a power off / power on
Since this is a big problem now, we are going to replace the switch on Monday with a catalyst 3560 switch (temporary) to see if soemthing changes. I am sure problem will be solved, because the 3560 switch is for sure 100% OK
Thanks you very much for your help,
How can I open an RMA for this switch?
I want to replace it.
After we power cycle the switch it works for 1 or 2 days (longer then a simple reboot)
This morning I lost again 2 routers, could not ping, but saw them with cdp neighbors.
After reload of switch the routers were accesible again.
The RMA procedure is the same as for IOS switches?
The problem was that the internal CUE module from the 2901 had the same address with a wirless (non-cisco) access router.
Only when we replaced the SG-300 with a 3560 switch did we see the syslog messages (%SW_MATM-4-MACFLAP_NOTIF) that pointed us to this problem.
On the SG-300 we didn't see any indication about this problem.