The problem is between management interface Nexus 2248 and MDS9148, sometimes there is connection lost between this interfaces. To solve the problem immedialtly, it's necessary to put a PC or reboot Nexus2248. Then if you wait a moment the connexion back again. In attachment, the IOS version :
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
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The copyrights to certain works contained herein are owned by
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BIOS: version 1.3.0
loader: version N/A
kickstart: version 5.0(2)N1(1)
system: version 5.0(2)N1(1)
power-seq: version v1.2
BIOS compile time: 09/08/09
kickstart image file is: bootflash:/n5000-uk9-kickstart.5.0.2.N1.1.bin
kickstart compile time: 10/15/2010 0:00:00 [10/15/2010 10:00:43]
system image file is: bootflash:/n5000-uk18.104.22.168.N1.1.bin
system compile time: 10/15/2010 0:00:00 [10/15/2010 11:34:05]
cisco Nexus5010 Chassis ("20x10GE/Supervisor")
Intel(R) Celeron(R) M CPU with 2073416 kB of memory.
Processor Board ID JAF1434BHBG
Have you seeing this problem ?