I have an issue with the MGMT port on a Hp5900 where it would stay up for a couple of minutes and put it self in a "down" state.
This would happen when I put the MGMT port as "shutdown" and when I do "undo shutdown", the MGMT port would come alive and go back down in a "down" state.
[hp5900-M-GigabitEthernet0/0/0]shutdown
[hp5900-M-GigabitEthernet0/0/0]%Jan 1 14:21:19:897 2011 hp5900-12 IFNET/3/PHY_UPDOWN: M-GigabitEthernet0/0/0 link status is down.
%Jan 1 14:21:19:899 2011 hp5900-12 IFNET/5/LINK_UPDOWN: Line protocol on the interface M-GigabitEthernet0/0/0 is down.
[hp5900-M-GigabitEthernet0/0/0]undo shutdown
[hp5900-M-GigabitEthernet0/0/0]%Jan 1 14:21:29:971 2011 hp5900-12 IFNET/3/PHY_UPDOWN: M-GigabitEthernet0/0/0 link status is up.
%Jan 1 14:21:29:972 2011 hp5900-12 IFNET/5/LINK_UPDOWN: Line protocol on the interface M-GigabitEthernet0/0/0 is up.
%Jan 1 14:21:29:988 2011 hp5900-12 LLDP/6/LLDP_CREATE_NEIGHBOR: Nearest bridge agent new neighbor created on Port M-GigabitEthernet0/0/0 (IfIndex 651), Chassis ID is bcea-faa1-658d, Port ID is GigabitEthernet1/0/2.
^ After this line, M-GigabitEthernet0/0/0 goes to a "down" state