HPE vsx updates using: vsx update-software command
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Prerequisite
1.) If you have enabled loop protect, enter the show loop-protect command for verifying that the
action on loop detection has a value of TX disable on the VSX interface. If the setting has a
different value, reset the value to TX disable by entering the loop-protect action tx-disable command:

switch(config)# interface lag 2 multi-chassis
switch(config-if)# loop-protect action tx-disable
switch(config-if)# exit
switch(config)# exit

2.) Check the status of the show vsx brief command and validate the ISL is in-sync and the keepalive is established.

3.) Check the output of the show lacp interfaces multi-chassis command and note which LACP interfaces are in a forwarding state of up.


Procedure

1.) Install
switch# vsx update-software tftp://192.168.1.1/XL.10.0x.xxxx vrf mgmt
Do you want to save the current configuration (y/n)? y
The running configuration was saved to the startup configuration.

This command will download new software to the %s image of both the VSX
primary and secondary systems, then reboot them in sequence.

The VSX secondary will reboot first, followed by the primary.
Continue (y/n)? y
VSX Primary Software Update Status : <VSX primary software update status>
VSX Secondary Software Update Status : <VSX secondary software update status>
VSX ISL Status : <VSX ISL status>
Progress [.............................................................................]
Secondary VSX system updated completely. Rebooting primary.

see also: https://arubanetworking.hpe.com/techdocs/AOS-CX/10.13/HTML/vsx/Content/Chp_Upg/upg-swi-usi-vsx-upd-sof-com-10.htm

2.) Run the show vsx brief command on both switches. Verify that ISL is In-Sync by running the
show vsx brief command on both switches. Verify in the output of the command that the keepalive state is Keepalive-Established

3.) Validate on both switches that the downstream LACP links are all forwarding correctly by entering the "show lacp interfaces" command.

4. Save the running configuration to the startup configuration: "write memory"

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see also: https://arubanetworking.hpe.com/techdocs/AOS-CX/10.16/PDF/vsx.pdf

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