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10G links issues and 10Gbase-LR

Greetings,

I have a 10G link that keeps flapping between two sites connected through 2x Nexus 3548 and 5672.

 

How can I rule out that the SFP are not the problem ?

 

Thanks,

Edouard.

1 Accepted Solution

Accepted Solutions

Sergiu.Daniluk
VIP Alumni
VIP Alumni

Hi @EdouardZorrilla0939 ,

When it comes to Layer 1 issues, these are the steps you can follow:

 

1. Change the fiber/cable.

  • If the problem is resolved - the problem is the fiber/cable.
  • If the problem persists, continue to next step.

2. Change the SFP one side at a time (both sides, if you cannot do a lot of tests. Doing one side at a time, gives you more granularity). Also, verifying the "show interface transceiver details" can indicate if the power levels are ok.

  • If the problem is resolved - the problem is the sfp.
  • If the problem persists, continue to next step.

3. Change the port, one side at a time, preferably and if possible on different ASIC (not the case for N3k)

  • If the problem is resolved - the problem is the physical port or ASIC.
  • If the problem persists, continue to next step.

4. Change the NIC (if one side is a server)

  • If the problem is resolved - the problem is the NIC.
  • If the problem persists, it is a problem on higher OSI level (software generated flaps).

 

Hope it helps,

Sergiu

View solution in original post

1 Reply 1

Sergiu.Daniluk
VIP Alumni
VIP Alumni

Hi @EdouardZorrilla0939 ,

When it comes to Layer 1 issues, these are the steps you can follow:

 

1. Change the fiber/cable.

  • If the problem is resolved - the problem is the fiber/cable.
  • If the problem persists, continue to next step.

2. Change the SFP one side at a time (both sides, if you cannot do a lot of tests. Doing one side at a time, gives you more granularity). Also, verifying the "show interface transceiver details" can indicate if the power levels are ok.

  • If the problem is resolved - the problem is the sfp.
  • If the problem persists, continue to next step.

3. Change the port, one side at a time, preferably and if possible on different ASIC (not the case for N3k)

  • If the problem is resolved - the problem is the physical port or ASIC.
  • If the problem persists, continue to next step.

4. Change the NIC (if one side is a server)

  • If the problem is resolved - the problem is the NIC.
  • If the problem persists, it is a problem on higher OSI level (software generated flaps).

 

Hope it helps,

Sergiu

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