To a port of switch WS-C2940-8TF-S, I have connected a converter Ethernet / 485 which connects finally to a Door Access Controller, The comunicacion with the converter is lost mysterious, him is done ping and gives time out.
The configuration of the port is the following one:
switchport mode access
switchport port-security switchport
port-security mac-address 0020.4a52.11c8
On the other hand I have a switch WS-C2940 with the same problem Configured of the following form:
Port-security configuration is correct, the problem is following:
I am running into a known Cisco software caveat CSCsb79517:
The 2940's Fast Ethernet port does not transmit frames.
The exact conditions that trigger this problem in the customer environment are not known.
The transmit lockups have been reported to occur in most cases on ports operating at speed 10 and duplex half.
The transmit (Tx) lockups can be recreated in the lab when there is a rapid increase in the rate of change of traffic transmitted by the 2940 switch. The Tx lockups are reproducible in the lab for all speed and duplex combinations but the Tx lockups
are very difficult to reproduce on ports operating at speed 100 and duplex full.
Move the device to a different port on the switch as a temporary workaround.
Software reload or power cycle of 2940 to clear the transmit lockup.
Certainly the two switches are connected to 10 half.
I am going to carry out upgrade of IOS, which corrects this problem.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...