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Cisco Bug: CSCuo17554 - MTU: Peer-Link on F2E Module not Programmed with 9216 MTU

Last Modified

Feb 15, 2018

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.2(2) 6.2(2a) 6.2(6)

Description (partial)

When using images 6.2(x), and creating a peer-link between two F2E modules, the hardware is not programmed for MTU 9216 and remains at 1500 only.

When trying to ping across the peer-link with a MTU value higher than 1500, it fails (with or without df-bit set for the pings).

- Peer-link built on F2E module
- NX-OS version of 6.2(x)
- Mismatch between hardware and software MTU values
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