Trying to use the dedicated rear 21Gbps stacking ports on X450-G2 but no bueno

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I'm wondering what I'm doing wrong here, I currently have a stack of 5 switches (All X450-G2 using the front 10Gb ports)

Slot-1 ex-460-chi.1 # show stacking

Stack Topology is a Daisy-Chain

Active Topology is a Daisy-Chain

Node MAC Address    Slot  Stack State  Role     Flags

------------------  ----  -----------  -------  ---

*00:04:96:9a:26:e7  1     Active       Master   CA-

 00:04:96:99:ee:b3  2     Active       Standby  CA-

 00:04:96:9a:27:10  3     Active       Standby  CA-

 00:04:96:9a:26:e2  4     Active       Standby  CA-

 00:04:96:9a:27:80  5     Active       Standby  CA-

* - Indicates this node

Flags: (C) Candidate for this active topology, (A) Active Node

(O) node may be in Other active topology

Slot-1 ex-460-chi.2 # 

I'm plugging in the rear dedicated 21Gbs ports but not getting any link light, do I need to disable the stack first before? Hopefully not as I'd love to do this the easy way :) 
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Tom

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Posted 11 months ago

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Tom

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Wonder if this has something to do with it? 

Slot-1 ex-460-chi.4 # show stacking-support 


Stack    Available Ports

Port    Native  Alternate  Configured  Current

-----   -----------------  ----------  ----------

1       Yes     51 *       Alternate   Alternate   

2       Yes     52 *       Alternate   Alternate   

stacking-support:          Enabled     N/A       


Flags: * - Current stack port selection


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Grosjean, Stephane, Employee

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For some reason, you already have configured your stack using "alternate" port, ie the 10G front ports, instead of the "Native" stacking ports (rear). Also, you are in daisy-chain, which is not recommended.

I think you need to reboot when you change from alternate port to native port.
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Ram, Employee

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From the provided output, I do not see a backup slot has been configured. Looks like a stack configuration issue. Could you try to rebuild the stack from scratch? Please execute the command "unconfigure switch all" from master slot to factory default the switches.

if you are going to configure stack using the native stacking ports (dedicated stack ports), then please follow the below mentioned steps:
https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-create-stack-with-Summit-X460-48p-and-Summit-X460-24p
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Ram, Employee

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Also, I could see the Stack Topology is a Daisy-Chain. Please make sure all the stack cables are intact properly.

If you are using alternate stacking, then please follow the below mentioned steps:
https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-implement-alternate-stacking

For more information on stacking relates queries, please refer the below mentioned article:
https://gtacknowledge.extremenetworks.com/articles/How_To/Getting-started-with-Summit-Stacking
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Grosjean, Stephane, Employee

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There's no backup because this is a daisy chained topology. Easy setup will default to that in such topology.