In my environment we have 3750x switches running ios 15.0 (1) SE2. We have port security mac address sticky configured on all our switch ports.

I noticed that we have several interfaces (on different switches) that are up but have not captured the MAC address from the workstation. When a bridge receives a BPDU with the TC bit set from a neighbor, these occur: It clears the MAC addresses learned on all its ports, except the one that receives the topology change. It starts the TC While timer and sends BPDUs with TC set on all its designated ports and root port (RSTP no longer uses the specific TCN BPDU, unless a legacy bridge needs to be notified).

So, do a sh spann vlan xx detail and see if there is a lots of topology changes I also have seen some IP camera decoders that in order to see the MAC in the MAC table, you have to ping the device first. 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 63000 bits/sec, 51 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts (0 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast, 0 pause input 0 input packets with dribble condition detected 56272056 packets output, bytes, 0 underruns From that output I can see that there are no packets coming in to the interface, and many packets out of it. A switch will not learn a MAC address if it doesn´t receive any packet from the host. 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.

So, the first question to ask is why the host is not sending any packets through this interface? You may check NIC config, if you are using any sort of redundancy let us know. Erik, we see exactly the same problem on stacks of 3750X switches running IOS 15.0 (1) SE2 (ipbase image). 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. In all cases the affected ports are 'secured' to a single computer, and are configured with 'spanning-tree portfast'.

Hi Erik, Hope ip routing is disabled on 3750 switch, use below method to find out interface using mac address database, Ex- you are trying to find 172.16.1.20 host interface, First ping from your core switch (L3) to 172.16.1.20 where host gateway (Ex.172.16.1.1) was configured, then issue sh ip arp 172.16.1.20 on core, here is your host mac address, then copy mac address and telnet to your host connected switch, and issue sh mac address add xxxx.xxxx.xxxx whoh! You have found interface of connected host, HTH. Hi all, The issue is that the host connected only receives traffic and does not sent - maybe does not send on this interface. GigabitEthernet2/0/11 is up, line protocol is up (connected) ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:00:00, output hang never Last clearing of 'show interface' counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5454502 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 63000 bits/sec, 51 packets/sec Having in mind that the FDB is build by looking in the frame received on the port, and source mac address, and looking at the show interface output. Dan-Ciprian Cicioiu wrote: The issue is that the host connected only receives traffic and does not sent - maybe does not send on this interface.

Dan, I think the lack of traffic sent by the host on Erik's Gi2/0/11 interface is a red herring. I see dozens of ports with the same problem - i.e., MAC addresses not captured on switch ports - but all of them send and receive traffic normally. Again, I emphasize that this only happens on stacked 3750X switches, and never on the stack master (or at least, never on stack member 1, which happens to be the master).

I should also add that it happens on very roughly half the access ports that have link and line protocol up, and there doesn't appear to be any obvious pattern to the distribution of ports with the problem. I can't speak for Erik, who originally raised the issue, but it certainly appears that he and I are seeing the same thing. Regards, Michael.

Kyle McKay wrote:. Removing the 'switchport port-security' command on the individual interfaces and then re-applying it, solved the problem for me. That looked really promising, but unfortunately, it didn't work for me.

ICloud plays an important role in syncing your photos across your devices. It's especially helpful when you want to transfer photos between your devices wirelessly. However, it’s not without problems while using iCloud to sync photos from your iOS device to your computer (Mac or PC). Since the fixes to iCloud Photos Not Syncing to Windows PC have been provided already, this article only covers the solutions to the problem iCloud Photos Not Syncing to Mac, be it Mac Sierra or Mac High Sierra. Read on to get the details. Solutions to iCloud Photos Not Syncing to Mac If you find photos not downloading from iCloud to Mac or iCloud photos not syncing to Mac, there are two ways you can choose. One is to use an alternative way to sync photos from your iPhone or iPad to Mac (as shown in Solution 1), the other is to try the potential solutions provided to fix the issue.

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