SGE2000 slow forwarding as accessswitch with LACP to SG500X stack

[jelledejong]

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-config
config-file-header
SG500X-03
v1.3.0.62 / R750_NIK_1_3_647_260
CLI v1.0
set system queues-mode 4
file SSD indicator encrypted
@
ssd-control-start
ssd config
ssd file passphrase control unrestricted
no ssd file integrity control
ssd-control-end cb0a3fdb1f3a1af4e4430033719968c0
!
port jumbo-frame
vlan database
vlan 2-10
exit
voice 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_phone
voice 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-ip
bonjour interface range vlan 1
hostname SG500X-03
line ssh
exec-timeout 0
exit
username cisco password encrypted ********************************* privilege 15
ip ssh server
clock timezone GMT +1
clock source sntp
sntp unicast client enable
sntp unicast client poll
sntp server 192.168.22.84 poll
sntp 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-config
spanning-tree mode rstp
interface range ethernet 1/g(11-12,23-24)
channel-group 8 mode auto
exit
interface vlan 1
ip address dhcp hostname SGE2000-03
exit
hostname SGE2000-03
line ssh
exec-timeout 0
exit
username admin password ***************** level 15 encrypted
ip ssh server
clock timezone +1
clock source sntp
sntp unicast client enable
sntp unicast client poll
sntp server 192.168.22.84 poll
sntp 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

[Tom Watts]

Hi Jelle, this is most likely due to spanning tree. Manually change the spanning tree port mode for client ports to "port fast" and this should resolve it. Do not configure port fast on links interconnecting switches.

-Tom
Please mark answered for helpful posts

[jelledejong]

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.