Hello,
I facing difficulties on my LAN.
I've a core 3850 stack, and 2960X access switches.
- An OEM switch is connected to the 3850 in a meeting room. When some PCs are connected on this switch, MAC Address going into 3850 mac address-table :
3850#show mac address-table | i 6d75
3 aaaa.bbb9.6d75 STATIC Gi1/0/5
- But when PC leaves OEM switch, and when I connect it directly to an access 2960 switch, its MAC address stays in 3850 table on the same port. I can see its IP address also, but it have no connectivity (impossible to ping gateway which is 3850) :
3850#sh ip arp | i 6d75
Internet 192.168.34.108 0 aaaa.bbb9.6d75 ARPA Vlan3
3850#ping 192.168.34.108
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.34.108, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
- So the only way to have connectivity, is to shut/no shut the Gi1/0/5 port on the core, where the OEM switch is connected. And now, mac address appears from the new place :
3850#show mac address-table | i 6d75
3 aaaa.bbb9.6d75 DYNAMIC Po1
3850#sh int desc
Interface Status Protocol Description
Po1 up up ## Downlink to 2960 ##
2960#show mac address-table | i 6d75
3 aaaa.bbb9.6d75 STATIC Gi3/0/13
Here is the Gi1/0/5 port configuration :
interface GigabitEthernet1/0/5
description ## User Port ##
switchport access vlan 3
switchport mode access
switchport port-security maximum 8
switchport port-security
switchport port-security aging time 2
switchport port-security violation restrict
switchport port-security aging type inactivity
logging event link-status
no snmp trap link-status
storm-control broadcast level 5.00
storm-control action trap
spanning-tree portfast
spanning-tree bpduguard enable
end
Can you help me about that ?
Thanks
