failing IP communication across the network with 3750x
I'm facing a very odd problem. A week ago I've installed a 3750x on a client. On it, was connected, a Lan2Lan fiber channel(with IP associated directly to the interface) and a MPLS link(over a Cisco 2901) interconnecting a branch, and several HP v1910 L2 swtiches.
By the day of the activation, everything works great. I have at this first moment, configured static routes with IP SLA on the L2L link and, with higher cost on the MPLS due the larger bandwidth of the L2L. It worked very well, and the tests of redundancy were ok.
My problems started a couple of days after. First, I've lost the IP communication with the L2 switches from the stations, but, from the 3750x, they still were accessible(both telnet and ping).
And now, there's another problem. Because of a previous design, there are two gateways configured across the network, all the stations and some servers, use as the default gateway the IP 10.31.1.1, and several servers and other appliances where configured with the gateway 10.31.1.2. So, as a workaround, I had configured both address on the 3750x, the 10.31.1.1/16 as primary IP and the 10.31.1.1/16 as secondary IP, both are on the VLAN 1 yet, as all the devices. All the stations, servers and appliances are configured with this /16 mask. And, it is working.
The problem is, every time that the communications between the branches is changed from one link to the another, on some servers and appliances, after the IP SLA take away the route, the communications only occurs if I manually change the default gateway on the servers/appliance to the other IP, and, get back to the previous one.
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