CASM-3166 | aruba split cables rel/main (Cray-HPE#3343)

Aruba splitter cable and readme update

.spelling

@@ -478,6 +478,7 @@ PVs
 QLogic
 QSFP-DD
 quiescing
+Quad-SFP
 Rados
 Rados-Gateway
 re-architecting

operations/network/management_network/README.md

@@ -18,6 +18,9 @@ accessory drawings in this document are for illustration only, and may not exact
 
 ## Contents
 
+* [Adding EX2500 cabinet to CSM management network](hardware/ex2500.md)
+* [Aruba edge switch cabling guide](edge_switch_cabling_guide.md)
+* [Aruba split cables](aruba_split_cables.md)
 * [Adding Switch Admin Password to Vault](#adding-switch-admin-password-to-vault)
 * [Switch configuration states](#switch-configuration-states)
 * [Starting points](#starting-points)

operations/network/management_network/aruba_split_cables.md

@@ -0,0 +1,30 @@
+<!-- markdownlint-disable MD013 -->
+# Aruba splitting of QSFP+ and QSFP28 ports
+
+Quad-SFP (QSFP+ and QSFP28) ports allow for four channels of lower-bandwidth communication.
+
+AOS-CX release 10.05 introduced this feature for select switches and modules.
+
+* A QSFP+ 40G port can be split into four(4) 10G speed ports
+* A QSFP28 100G port can be split into four(4) 25G speed ports
+
+Most QSFP28 ports can be used with either 40G or 100G optics, DAC or AOC cables. Not all QSFP28 port can be split into channels of 10G or 25G: what's required are MACs and PHYs that can support both 10G and 25G speeds.
+
+Some designs will allow only splitting into the four (4) channels at 10G because they lack a 25G MAC (for example, the Aruba 8325 Switch Series JL627A 32 port 40G/100G). Some switches/modules also limit only certain ports to be split because of design combinations of PHY/Ports or limitations of the maximum number of MACs in a switching ASIC.
+
+```bash
+An example CLI configuration for port 1/1/52:
+switch(config-if)# interface 1/1/52
+switch(config-if)# split
+This command will disable the specified port, clear its configuration,
+and split it into multiple interfaces. The split interfaces will not
+be available until the next system or line module reboot.
+Continue (y/n)? y
+switch(config-if)# show interface brief
+------------------------------------------------------------------------------------
+Port Native Mode Type Enabled Status Reason Speed Description
+VLAN (Mb/s)
+------------------------------------------------------------------------------------
+1/1/52:1 -- routed QSFP+DA3x4 yes up 10000 Aruba-AP
+1/1/52:2 -- routed QSFP+DA3x4 yes up 10000 --
+```