Verify the BGP neighbors are in the established state on BOTH the switches.
Check Aruba BGP status.
show bgp ipv4 u s
Example output:
VRF : default
BGP Summary
-----------
Local AS : 65533 BGP Router Identifier : 10.252.0.3
Peers : 4 Log Neighbor Changes : No
Cfg. Hold Time : 180 Cfg. Keep Alive : 60
Confederation Id : 0
Neighbor Remote-AS MsgRcvd MsgSent Up/Down Time State AdminStatus
10.252.0.2 65533 45052 45044 02m:02w:02d Established Up
10.252.1.7 65533 78389 90090 02m:02w:02d Established Up
10.252.1.8 65533 78384 90059 02m:02w:02d Established Up
10.252.1.9 65533 78389 90108 02m:02w:02d Established Up