static mac-addresses disappear !

[ohassairi]

                   hi experts

we configured in our c6500 switch (vss: sup-bootdisk:/s72033-adventerprisek9_wan-mz.122-33.SXI3.bin) some static mac addresses for windows NLB needs.

something like this:

mac-address-table static 03bf.0a0a.0aae vlan 10 interface GigabitEthernet1/2/12 GigabitEthernet2/1/1

mac-address-table static 03bf.0a46.0a78 vlan 70 interface GigabitEthernet2/1/35 GigabitEthernet2/2/6

mac-address-table static 03bf.0a96.0a78 vlan 150 interface GigabitEthernet2/1/15 GigabitEthernet2/2/1

mac-address-table static 03bf.0a97.0a78 vlan 151 interface GigabitEthernet1/1/13 GigabitEthernet2/1/28

we noted that after some time some of these entries will disappear from the configuration. i re-enter them manually but the problem happens again after some time (some days)

is it a  bug or is there some missing things in the conf ?

thanks a lot for your help

[mhnedirli]

can you see the static entries in the running-config

[ohassairi]

no

when the problem occurs i can't see some of these. some times all of them disappear in running and startup config