Here is a technote (24 pages) to provide branch gateways (BGW) redundancy and to be able to share the uplinks on each of the branch gateways.
The last section of this guides provides general time it takes for
· 9004-LTE BGW to bring up its LTE interface when WAN uplink 0/0/0 is disconnected
· Reconnected WAN uplink on 0/0/0 to become active for the user traffic
· Backup LTE BGW to be the active gateway when the LAN interfaces on 9004 Gateway is disconnected.
· The pre-emption of the preferred leader(9004 BGW) when it's LAN interfaces are reconnected
Hope you'll find it useful and as always please send through your feedback for improvement.
------------------------------
If my post was useful accept solution and/or give kudos.
Any opinions expressed here are solely my own and not necessarily that of HPE or Aruba.
------------------------------