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HP5130 connecting to E5500 inconsistent port errors

Noewon
Occasional Visitor

HP5130 connecting to E5500 inconsistent port errors

We've recently begun rolling out 5130 models as a POE switch in edge buildings. At some older sites, the core switch is still an E5500-24G switch, with an 8-port fibre module in the rear of the switch.  When the 5130 is plugged into the 8-port module, the port constantly drops out.   If the same SFP and fibre lead is moved to the front port of the same E5500 switch, the connection is stable. 

At the CON side, the messages in the logs are (this is just looped every 10-20 secs):

%Apr 27 09:26:21:678 2016 S074055GIBlockCON LLDP/3/DELREM:- 2 -Port GigabitEthernet2/1/1 (IfIndex 82):Deleted Neighbor,Chassis ID: 2C23-3ABC-1146; Port ID: Ten-GigabitEthernet1/0/25.
%Apr 27 09:26:23:656 2016 S074055GIBlockCON LLDP/3/CREREM:- 2 -Port GigabitEthernet2/1/1 (IfIndex 82):Created New Neighbor,Chassis ID: 2C23-3ABC-1146; Port ID: Ten-GigabitEthernet1/0/25.

 

at the edge switch:

%Jan 8 06:21:55:399 2013 S0740HP5130BlockM IFNET/3/PHY_UPDOWN: Ten-GigabitEthernet1/0/25 link status is down.
%Jan 8 06:21:55:400 2013 S0740HP5130BlockM IFNET/5/LINK_UPDOWN: Line protocol on the interface Ten-GigabitEthernet1/0/25 is down.
%Jan 8 06:21:55:443 2013 S0740HP5130BlockM IFNET/3/PHY_UPDOWN: Vlan-interface1 link status is down.
%Jan 8 06:21:55:445 2013 S0740HP5130BlockM IFNET/5/LINK_UPDOWN: Line protocol on the interface Vlan-interface1 is down.
%Jan 8 06:21:55:728 2013 S0740HP5130BlockM IFNET/3/PHY_UPDOWN: Ten-GigabitEthernet1/0/25 link status is up.
%Jan 8 06:21:55:731 2013 S0740HP5130BlockM IFNET/5/LINK_UPDOWN: Line protocol on the interface Ten-GigabitEthernet1/0/25 is up.
%Jan 8 06:21:55:740 2013 S0740HP5130BlockM IFNET/3/PHY_UPDOWN: Vlan-interface1 link status is up.
%Jan 8 06:21:55:747 2013 S0740HP5130BlockM IFNET/5/LINK_UPDOWN: Line protocol on the interface Vlan-interface1 is up.
%Jan 8 06:21:55:969 2013 S0740HP5130BlockM STP/6/STP_DETECTED_TC: Instance 0's port Ten-GigabitEthernet1/0/25 detected a topology change.
%Jan 8 06:21:56:570 2013 S0740HP5130BlockM IFNET/3/PHY_UPDOWN: Ten-GigabitEthernet1/0/25 link status is down.

 

Anyone have any ideas?