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Can't ping between S3928P-EI and NE 40 using GE interface after restarting all the equipments

Publication Date:  2012-07-27 Views:  54 Downloads:  0
Issue Description
I configure the two equipments as following :
[NE 40]
interface GigabitEthernet4/0/0
 undo negotiation auto
 undo shutdown
 ip address 192.168.1.58 255.255.255.252
[S3928P-EI]
 interface Vlan-interface15
 description go to ne 40
 ip address 192.168.1.57 255.255.255.252
interface GigabitEthernet1/1/1
 duplex full
 speed 1000
 port access vlan 15
The equipments can ping each other. After restarting the two equipments at the same time, the ping is not successful. 
      
Alarm Information
Null
      
Handling Process
I change the port GE to use auto negotiation in NE 40 and S3928-EI as follow :
[NE40]
interface GigabitEthernet4/0/0
negotiation auto
 undo shutdown
 ip address 192.168.1.58 255.255.255.252
[S3928P-EI]
 interface Vlan-interface15
 description go to ne 40
 ip address 192.168.1.57 255.255.255.252
interface GigabitEthernet1/1/1
 speed auto
 port access vlan 15
I restart the equipments, the NE 40 can ping S3928-EI and vice-versa. 
Root Cause
The ping was not successful but the two interfaces were UP.
Suggestions
share the experience of troubleshooting procedure 
      

END