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Nexus 4k <=> Nexus 5k

Hi @ll,

we have a new Datacenter connection between a Nexus 5596 and a Nexus 4001i (IBM H-series Chassis).

We encounter a noticable performance degradation and see a lot of output-errors on the N5K side and tons of Input discards/CRC errors on the N4K Port.

n4k# sh int eth1/16 | inc discard

    1009677132 input discard

n4k# sh int eth1/16 | inc CRC

    0 no buffer 0 runt 2568519 CRC 0 ecc

n5k:sh int po 1 | inc errors

    1056081 output errors  0 collision  0 deferred  0 late collision

We already exchanged the LWL-Cable without any improvement.

Software N4K: 4.1(2)E1(1f)

Software N5K: 5.1(3) N2 (1a)

Any hints ?

KR Gregor

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