I am hoping someone may have come across an issue I am seeing on a Cisco
4900M running 15.1(2)SG3.
I have a device connected to an interface sending traffic from it's own
MAC address to MAC address ff:ff:ff:ff:ff:ff. When the layer 3 protocol
is IPv6 I see this going out other port in the same vlan as the source -
all good. When the layer 3 protocol is IPv4 the frames seem to go into
a black hole - very bad. I have confirmed all this with packet captures.
I have poked around but cam find any indication of the issue. I will be
logging a TAC case in the next day or two for this but would be
interested to hear if anyone else has seen this.
Thanks
Ivan
PS. Not really looking to get into the details of the connected devices
etc - just some HA type traffic using layer 2 over a vlan.
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