Port channeling SX350 & SX550

[JonathanPBL]

Hi Guys,

Got a strange issue between our core switch SX550-48 to our edge switch SX350-48. We use 4 copper links between the edge and core in a single port channel. The core switch shows all physical links up but the edge side is down. Not sure what is going on here but we have the same config on all of our switches stack across the site which works fine.

Edge side

Load balancing: src-dst-mac.

Gathering information...
Channel Ports
------- -----
Po1 Active: te2/0/1-2 Non-candidate: te1/0/1-2

te1/0/1 10G-Combo-C -- -- -- -- Down -- --
te1/0/2 10G-Combo-C -- -- -- -- Down -- --

te2/0/1 10G-Combo-C Full 1000 Enabled Off Up Disabled Off
te2/0/2 10G-Combo-C Full 1000 Enabled Off Up Disabled Off

Core side:

Load balancing: src-dst-mac.

Gathering information......
Channel Ports
------- -----
Po4 Active: gi1/0/10,gi2/0/10 Non-candidate: gi1/0/9,gi2/0/9

gi1/0/9 1G-Copper Full 1000 Enabled Off Up Disabled Off
gi1/0/10 1G-Copper Full 1000 Enabled Off Up Disabled On

gi2/0/9 1G-Copper Full 1000 Enabled Off Up Disabled Off
gi2/0/10 1G-Copper Full 1000 Enabled Off Up Disabled On

Thanks a lot!

Jonathan

[Deepak Kumar]

Hi,

Can you check that non-candidate ports are getting suspended or not?

If Ports are in suspended mode then restart that remote switch. I am facing same issue with 550X from the last 1 year. No solution found yet.

[JonathanPBL]

Hey Keepak,

Thanks for the reply. Can confirm that the port's are not suspended - very strange one. Tried changing the cables too incase of a physical issue.

Jonathan

[paul driver]

Can you post  the config of the physical and pc interfaces from both switches please?

[JonathanPBL]

Hi Paul,

Thanks for the replay. Please see below.

Edge switch

interface TenGigabitEthernet1/0/1
lacp port-priority 1000
no spanning-tree portfast
spanning-tree link-type point-to-point
channel-group 1 mode auto
switchport mode trunk
lldp med disable
!
interface TenGigabitEthernet1/0/2
lacp port-priority 1000
no spanning-tree portfast
spanning-tree link-type point-to-point
channel-group 1 mode auto
switchport mode trunk
lldp med disable

interface TenGigabitEthernet2/0/1
lacp port-priority 2000
no spanning-tree portfast
spanning-tree link-type point-to-point
channel-group 1 mode auto
switchport mode trunk
lldp med disable
!
interface TenGigabitEthernet2/0/2
lacp port-priority 2000
no spanning-tree portfast
spanning-tree link-type point-to-point
channel-group 1 mode auto
switchport mode trunk
lldp med disable

interface Port-Channel1
no spanning-tree portfast
spanning-tree link-type point-to-point
switchport mode trunk

Core side

interface GigabitEthernet1/0/9
description ST4-SW1-49
lacp port-priority 1000
spanning-tree link-type point-to-point
channel-group 4 mode auto
switchport mode trunk
!
interface GigabitEthernet1/0/10
description ST4-SW2-49
lacp port-priority 1000
spanning-tree link-type point-to-point
channel-group 4 mode auto
switchport mode trunk

interface GigabitEthernet2/0/9
description ST4-SW1-50
lacp port-priority 2000
spanning-tree link-type point-to-point
channel-group 4 mode auto
switchport mode trunk
!
interface GigabitEthernet2/0/10
description ST4-SW2-50
lacp port-priority 2000
spanning-tree link-type point-to-point
channel-group 4 mode auto
switchport mode trunk

interface Port-Channel4
loopback-detection enable
description Stack4
spanning-tree link-type point-to-point
switchport mode trunk