OK - considering the rear ports are not intended to be used for data ports, you won't find any information on this in the manuals etc. Using them as just data ports is easy enough, but splitting them up and using some for stacking and some for data ports requires some finangling to make the stacking code not try and take over all 4 ports.
However it's possible and stable across reboots etc. basically follow this, it might take you a couple times. This will enable stacking between two units just using the 40gbE qsfp ports, leaving 4x breakout QSFPs total available for data use
Code:
#unplug all stacking cables except for 1, going between port 1/2/1 on unit 1 and 1/2/1 on unit two
#don't plug anything else into unit 2 or you'll get a loop
#first you have to unstack all the units and remove any existing stack configuration:
enable
stack unconfigure all
write mem
reload
#both switches should reload, wait till they come back up
#when they're back up, on unit 1:
enable
conf t
stack unit 1
no stack-trunk 1/2/1 to 1/2/2
stack-port 1/2/1 1/2/6
#ignore the warning that pops up about not showing up in "show run"
#still running the below on unit 1!
stack unit 2
no stack-trunk 2/2/1 to 2/2/2
stack-port 2/2/1 2/2/6
#ignore the warning that pops up about not showing up in "show run"
exit
stack enable
write mem
exit
stack secure-setup
#When the setup is done, do "show run"
#stack unit 2 section probably has "stack-trunk 2/2/1 to 2/2/2" added back to it
#the second switch is currently rebooting to rejoin the stack, wait for it to do so
#once it comes back online, do the following to remove the stack unit 2 trunk:
#still on unit 1:
conf t
stack unit 2
no stack-trunk 2/2/1 to 2/2/2
#will probably reboot unit 2 again
#wait for it to come back online, then connect the second pair of 40gbE ports
Once you connect the second pair of 40gbe ports (1/2/6 on unit 1 to 1/2/6 on unit 2) you should be done. Check by running "show stack", you should see both units "ready" with the connection diagram showing both 40gbE ports linked up like below:
Code:
ICX1#sh stack
T=6m28.6: alone: standalone, D: dynamic cfg, S: static
ID Type Role Mac Address Pri State Comment
1 S ICX6610-48P active cc4e.24b8.d9d0 128 local Ready
2 S ICX6610-48P standby cc4e.243e.aa74 0 remote Ready
active standby
+---+ +---+
-2/6| 1 |2/1--2/1| 2 |2/6-
| +---+ +---+ |
| |
|------------------------|
Standby u2 - protocols ready, can failover
Current stack management MAC is cc4e.24b8.d9d0
If you have the same output, do a "write mem" then a "reload" to reload the whole stack. It should come back up fresh in the correct state and running "show stack" again should have the same output as before.
Your final stacking config should look like this:
Code:
stack unit 1
module 1 icx6610-48p-poe-port-management-module
module 2 icx6610-qsfp-10-port-160g-module
module 3 icx6610-8-port-10g-dual-mode-module
priority 128
stack-port 1/2/1 1/2/6
stack unit 2
module 1 icx6610-48p-poe-port-management-module
module 2 icx6610-qsfp-10-port-160g-module
module 3 icx6610-8-port-10g-dual-mode-module
stack-port 2/2/1 2/2/6
stack enable