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Beginner

Dual homed FEX - Nexus 5k

 

 

 

Hi All ,

 

We have dual homed connectivity to FEX from nexus 5k as below.

 

Nexus 5k-1  Eth 1/47 ----> Fex 100  -----> Eth 1/47 Nexus 5k-2 (VPC100 . Port-chhannel 100)

Nexus 5k-1  Eth 1/48 ----> Fex 101  -----> Eth 1/48 Nexus 5k-2 (VPC 101, Port-channel 101 ) 

 

But by mistake onsite engineer has connected Nexus 5k-1 eth 1/48 to Fex 100 and Nexus 5k-1 eth 1/47  to Fex 101.

 

Means Ports on Nexus 5k-1 are mismatched as below.

 

Nexus 5k-1  Eth 1/48  (must be eth 1/47) ----> Fex 100  -----> Eth 1/47 Nexus 5k-2 (VPC100 . Port-chhannel 100)

Nexus 5k-1  Eth 1/47 ( must be eth 1/148 ) ----> Fex 101  -----> Eth 1/48 Nexus 5k-2 (VPC 101, Port-channel 101 ) 

 

We have done FEX configuration on both nexus 5k switches.

Today Onsite engineer will do correction for mismatched ports on nexus 5k-1 , cable will be swapped for ports eth 1/47 and eth 1/48 to have right ports connected to FEX 100 and 101 from Nexus 5k-1.

 

I would like to know if onsite engineer swaps the cables of fex 100 and 101 on Nexus 5k-1 , will the fex again go for loading of IOS from Parent switch ?

 

** currently nothing is connected to Fex 100 and 101.

 

After swapping the cables on Nexus 5k-1 , what needs to be done so that ports on Fex 100 and 101 will work properly  ?  In case if i want both fex to download ios from parent switch after swapping cables what should be done ? Do I need to remove and connect back uplinks cables at FEX end so that IOS will download from the parent switch again ?

 

Actual scenario : 

Nexus 5k-1  Eth 1/47 ----> Fex 100  -----> Eth 1/47 Nexus 5k-2 (VPC100 . Port-chhannel 100)

Nexus 5k-1  Eth 1/48 ----> Fex 101  -----> Eth 1/48 Nexus 5k-2 (VPC 101, Port-channel 101 ) 

 

But onsite has connected cables as below.

 

Nexus 5k-1  Eth 1/48  (must be eth 1/47) ----> Fex 100  -----> Eth 1/47 Nexus 5k-2 (VPC100 . Port-chhannel 100)

Nexus 5k-1  Eth 1/47 ( must be eth 1/148 ) ----> Fex 101  -----> Eth 1/48 Nexus 5k-2 (VPC 101, Port-channel 101 ) 

 

Fiber Cables connected to fex 100 and 101 on Nexus 5k-1 will be swapped today so that we have correct ports connected to both fex from both Nexus 5ks. 

 

Thanks , M S K
1 REPLY 1
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VIP Advisor

Re: Dual homed FEX - Nexus 5k

When they remove from parent switch, and if you re-connect.

They going to reboot and come online as correct number.

 

if no device connected fine, if any device connected suggest to do change window.

check the FEX configuration again before before onsite engineer going to connect.

 

BB

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