Nexus 5548 arp request

[ezy]

I have Nexus 5548UP, Version version 5.0(3)N2(2b), with a flat configured network. Customer has put several IP subnets on one Vlan. In one subnet is an Siemens SPS wich connects to a Server. This SPS is not reachable since I send a ping from the N5k, then everything works fine. Sniffering that port no arp requests from the N5k are captured. That hapens with every device (Siemens SPS) in the network. Every other clients and server are working fine and there are no problems. Any ideas?

[Oleksandr Nesterov]

Hi Ezy

If you have configured several ip ranges in same SVI interface using "secondary" keyword like:

interface ethx/y

ip addrexx a.a.a.a/z

ip address b.b.b.b/z secondary

ip address c.c.c.c/z secondary

Routing issues between these ranges will occur.

There is a bug: CSCtx11610

So the best would be to create separate vlans for each ip range and not use "secondary" address configuration.

Bug is fixed an fix will be commited to next NX-OS release.

HTH,

Alex