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michael_kiiru
Beginner

MAC Address Roaming as STATIC entry on Uplink Switch

Hi,

I have a host connected to a switch running on IOS Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.2(2)E5 to a port whose config is herebelow.

sh run int g3/0/33
Building configuration...
Current configuration : 198 bytes
!
interface GigabitEthernet3/0/33
 switchport access vlan 24
 switchport mode access
 switchport voice vlan 124
 spanning-tree portfast
 spanning-tree bpduguard enable
end
the laptop is behind an IP phone and connects to the network okay, picks an IP address from the DHCP server but doesn't pass traffic.. (cant ping any other host on the network including its own gateway apart from only the switch where it is connected).
The MAC address of this host shows in the MAC address table of an upstream switch (which is the gateway) as a STATIC entry and connected to another port (interestingly not the trunk uplink port but another user port). We get the host back to the network by bouncing the port which makes it dynamically learnt and on the right switch.
Any experience with this kind of scenario? what could be causing the same?
thanks. Mike.
2 REPLIES 2
m.kafka
Enthusiast

Does this happen repeatedly?

Yes indeed. As a stop gap, when this happens I connect to the upstream switch that has the wrong port assignment for the mac address and shut/unshut it to release the mac address. But this happens againin a day or two.