Hello all,
I have 4 HP5520 (R8M27A), we stacked the 4 switchs using IRF works fine. We wanted to interconnect with another switch same logic 4 members :

The four interfaces are up but cant understand why only 2 seems to be up in the aggregate (speed stay at 2G) :
BAGG2 UP 2G(a) F(a) T 1 To Switch1
GE1/0/24 UP 1G(a) F(a) T 1 To Switch1-1/24
GE2/0/24 UP 1G(a) F(a) T 1 To Switch1-2/24
GE3/0/24 UP 1G(a) F(a) T 1 To Switch1-3/24
GE4/0/24 UP 1G(a) F(a) T 1 To Switch1-4/24
Here the configuration used (same for 3/0/24 & 4/0/24) :
interface Bridge-Aggregation2
description To BAG-Switch1
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan XXX XXX XX
link-aggregation mode dynamic
stp tc-restriction
dhcp snooping trust
interface GigabitEthernet1/0/24
port link-mode bridge
description To Switch1-1/24
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan XXX XXX XX
combo enable auto
stp tc-restriction
port link-aggregation group 2
dhcp snooping trust
interface GigabitEthernet2/0/24
port link-mode bridge
description Vers To Switch1-2/24
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan XXX XXX XX
combo enable auto
stp tc-restriction
port link-aggregation group 2
dhcp snooping trust
Only 2/0/24 & 4/0/24 seems active in the BAG2, when i disconnect both. Interface 3/0/24 go up and active the BAG2 have a speed of one even if two interfaces are still active when i disconnect 3/0/24 then 1/0/24 go active and the BAG speed stay at 1G :
IFNET/3/PHY_UPDOWN: Physical state on the interface GigabitEthernet2/0/24 changed to down.
IFNET/5/LINK_UPDOWN: Line protocol state on the interface GigabitEthernet2/0/24 changed to down.
LAGG/6/LAGG_ACTIVE: Member port GE3/0/24 of aggregation group BAGG2 changed to the active state.
LAGG/6/LAGG_INACTIVE_IFCFG_DEFAULT: Member port GE4/0/24 of aggregation group BAGG2 changed to the inactive state, because no LACPDU was received by the reference port.
IFNET/3/PHY_UPDOWN: Physical state on the interface GigabitEthernet4/0/24 changed to down.
IFNET/5/LINK_UPDOWN: Line protocol state on the interface GigabitEthernet4/0/24 changed to down.
IFNET/5/LINK_UPDOWN: Line protocol state on the interface GigabitEthernet3/0/24 changed to up.
BAGG2 UP 1G(a) F(a) T 1 To Switch1
GE1/0/24 UP 1G(a) F(a) T 1 To Switch1-1/24
GE3/0/24 UP 1G(a) F(a) T 1 To Switch1-1/24
My question is why is it not possible to have the 4 interfaces up in the BAGG2 ? i never managed to have the BAGG2 with a speed of 4G.
Thanks i advance for your help.