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No Ethernet Link on last four 1G SFP ports of Summit X460-G2 running EXOS v15.7.1

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TitleNo Ethernet Link on last four 1G SFP ports of Summit X460-G2 running EXOS v15.7.1
Symptoms
GBIC not working in X460-G2
Transceiver not working on EXOS 15.7.1, but working on 15.6
Last four 1GBASE-X SFP ports on Summit X460-G2 will not establish a connection
Link does not come up on the last 4 ports (1G SFP ports 49, 50, 51, 52) of X460G2-48-GE4
Link does not come up on the last 4 ports (1G SFP ports 29, 30, 31, 32) of X460G2-24-GE4
Optical port is stuck in Ready state and does not become active when known-good SFP+ module and cable are connected
Log message acknowledges insertion of the GBIC, but activity LED never lights and port does not go active
Environment
  • SummitX
  • EXOS 15.7.1
  • X460-G2-24t-GE4 
  • X460-G2-48t-GE4 
  • X460-G2-24p-GE4 
  • X460-G2-48p-GE4
Cause
Software bug
Resolution
Upgrade to EXOS 15.7.2, released on July 15, 2015.  The software fix is listed under xos0061283 in the release notes.
This is also resolved in EXOS 16.1 and greater.

Pre-upgrade workaround:
Use a different software branch, for example 15.6, rather than the affected 15.7.1.
Additional notes

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