SGE2000 slow forwarding as accessswitch with LACP to SG500X stack

Hello everyone,
Question: Does any body know why ports on my SGE2000 take so long (>60s) before forwarding packets to the end user systems (desktop computers).
I got two SG500X switches stacked in 10G mode and got two SGE2000 switches connected in LACP to the SG500X stack.
When I connect a computer to the SGE2000 switch it takes more then a minute before the port starts forwarding. I used the same configuration as I do with my SG300-52 and SRW2048 access witches where this set-up works fine and the port forwarding almost immediately.
I added the configuration of the SG500X and one of the two SGE2000 switches that I want to use as access ports for end users systems.
The SGE500X is connected to an other location on LACP ports (te1/1/1,te2/1/1) and the SGE2000 switch is connected to the SGE500X over LACP ports (gi1/1/11,gi1/1/23,gi2/1/11,gi2/1/23)
SG500X-03#show running-configconfig-file-headerSG500X-03v1.3.0.62 / R750_NIK_1_3_647_260CLI v1.0set system queues-mode 4file SSD indicator encrypted@ssd-control-startssd configssd file passphrase control unrestrictedno ssd file integrity controlssd-control-end cb0a3fdb1f3a1af4e4430033719968c0!port jumbo-framevlan databasevlan 2-10exitvoice vlan oui-table add 0001e3 Siemens_AG_phone________voice vlan oui-table add 00036b Cisco_phone_____________voice vlan oui-table add 00096e Avaya___________________voice vlan oui-table add 000fe2 H3C_Aolynk______________voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phonevoice vlan oui-table add 00d01e Pingtel_phone___________voice vlan oui-table add 00e075 Polycom/Veritel_phone___voice vlan oui-table add 00e0bb 3Com_phone______________port-channel load-balance src-dst-mac-ipbonjour interface range vlan 1hostname SG500X-03line sshexec-timeout 0exitusername cisco password encrypted ********************************* privilege 15ip ssh serverclock timezone GMT +1clock source sntpsntp unicast client enablesntp unicast client pollsntp server 192.168.22.84 pollsntp server 192.168.22.85 poll!interface gigabitethernet1/1/11 channel-group 3 mode auto!interface gigabitethernet1/1/12 channel-group 2 mode auto!interface gigabitethernet1/1/23 channel-group 3 mode auto!interface gigabitethernet1/1/24 channel-group 2 mode auto!interface tengigabitethernet1/1/1 channel-group 1 mode auto!interface gigabitethernet2/1/11 channel-group 3 mode auto!interface gigabitethernet2/1/12 channel-group 2 mode auto!interface gigabitethernet2/1/23 channel-group 3 mode auto!interface gigabitethernet2/1/24 channel-group 2 mode auto!interface tengigabitethernet2/1/1 channel-group 1 mode auto!interface Port-channel1 switchport mode general switchport general allowed vlan add 2-10 tagged!exit
SG500X-03#show version Unit SW version Boot version HW version------------------- ------------------- ------------------- ------------------- 1 1.3.0.62 1.3.0.03 V02 2 1.3.0.62 1.3.0.03 V02
SGE2000-03# show running-configspanning-tree mode rstpinterface range ethernet 1/g(11-12,23-24)channel-group 8 mode autoexitinterface vlan 1ip address dhcp hostname SGE2000-03exithostname SGE2000-03line sshexec-timeout 0exitusername admin password ***************** level 15 encryptedip ssh serverclock timezone +1clock source sntpsntp unicast client enablesntp unicast client pollsntp server 192.168.22.84 pollsntp server 192.168.22.85 poll
SGE2000-03# show version Unit SW version Boot version HW version------------------- ------------------- ------------------- ------------------- 1 3.0.0.18 2.0.0.03 00.00.01

Thank you Tom for taking the time to answer, much apreaciated. I found out that putting the SGE2000 switches manualy in standalone mode instead of the default stacked mode also removed some link down -> up > forwarding cycles on the SG500X stacked switches. I will try the port fast on the access ports next week and report back.

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