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

[Tom]

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 

[Tom]

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