In all cases the affected ports are "secured" to a single computer, and are configured with "spanning-tree portfast". It appears to affect only ports on stack members 2 or higher we've configured stack member 1 as master in all cases, but I don't know if this is relevant. You may check NIC config, if you are using any sort of redundancy let us know.Įrik, we see exactly the same problem on stacks of 3750X switches running IOS 15.0 (1) SE2 (ipbase image). So, the first question to ask is why the host is not sending any packets through this interface? I´m curious on why it is not receiving any packets, I´ve seen this in a load-balancing configuration on the NICs(on servers for example, one NIC receives packets and the other NIC sends) but since this is a workstation I really doubt this is the cause.
#CISCO MAC ADDRESS LEARNING PORT SECURITY MAC#
A switch will not learn a MAC address if it doesn´t receive any packet from the host. Input queue: 0/75/0/0 (size/max/drops/flushes) Total output drops: 5454502ĥ minute input rate 0 bits/sec, 0 packets/secĥ minute output rate 63000 bits/sec, 51 packets/secĠ input errors, 0 CRC, 0 frame, 0 overrun, 0 ignoredĠ input packets with dribble condition detectedĥ6272056 packets output, 9223565276 bytes, 0 underrunsĠ output errors, 0 collisions, 2 interface resetsĠ lost carrier, 0 no carrier, 0 pause outputĠ output buffer failures, 0 output buffers swapped outįrom that output I can see that there are no packets coming in to the interface, and many packets out of it. Last clearing of "show interface" counters never Last input never, output 00:00:00, output hang never Input flow-control is off, output flow-control is unsupported
Hardware is Gigabit Ethernet, address is 70ca.9bca.760b (bia 70ca.9bca.760b) GigabitEthernet2/0/11 is up, line protocol is up (connected)
SWIITCH(config)#do show mac address-t int g2/0/11 Switchport port-security mac-address sticky I noticed that we have several interfaces (on different switches) that are up but have not captured the MAC address from the workstation. We have port security mac address sticky configured on all our switch ports.
In my environment we have 3750x switches running ios 15.0 (1) SE2.
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