01-11-2019 06:30 AM - edited 03-08-2019 05:00 PM
Hi,
I have a LAG with port 8 (copper) and port 16 (fiber) between two SG550XG-8F8T
One leg of the LAG sometimes change from active to standby and I couldn't find a way to go back to Active.
Latest firmware 2.4.5.71 on both switches. No issue on port 16.
Cable between switch is 30cm long 10G Eth and already checked/swapped
Config is the same on both switches :
!
interface TengigabitEthernet1/0/8
no negotiation
channel-group 1 mode auto
!
interface TengigabitEthernet1/0/16
channel-group 1 mode auto
!
interface Port-Channel1
speed 10000
no negotiation
description BkpLink
switchport mode trunk
SW550XG#sh int po1
Load balancing: src-dst-mac-ip.
Channel Ports
------- -----
Po1 Active: te1/0/16 Non-candidate: te1/0/8
I don't understand why to port 8 goes to non-candidate after a variable time and how to go back to normal.
Solved! Go to Solution.
01-11-2019 08:02 AM
Hello,
--> I have a LAG with port 8 (copper) and port 16 (fiber) between two SG550XG-8F8T
This might be the problem, copper and fiber. As per the guidelines, all ports in a LAG must be of the same media type. Can you, for the sake of testing, connect two copper or two fiber ports ?
01-11-2019 06:51 AM - edited 01-11-2019 06:51 AM
Hello,
what if you disable LACP and configure static LAG (page 150 of the attached admin guide) ?
https://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbms/350xg/admin_guide/AG_Tesla_350_550.pdf
01-11-2019 07:17 AM
Changed mode to static.
Same issue, TE1/0/8 is now inactive instead of non-candidate. If I disconnect manually TE1/0/16, TE1/0/8 stay inactive and I loose the PO1 connection.
!
interface TengigabitEthernet1/0/8
no negotiation
channel-group 1 mode on
!
interface TengigabitEthernet1/0/16
channel-group 1 mode on
!
interface Port-Channel1
speed 10000
no negotiation
description BkpLink
switchport mode trunk
SW#sh int po1
Load balancing: src-dst-mac-ip.
Channel Ports
------- -----
Po1 Active: te1/0/16 Inactive: te1/0/8
If I disconnect TE1/0/16 :
Po1 Inactive: te1/0/8,te1/0/16
Thanks
01-11-2019 08:02 AM
Hello,
--> I have a LAG with port 8 (copper) and port 16 (fiber) between two SG550XG-8F8T
This might be the problem, copper and fiber. As per the guidelines, all ports in a LAG must be of the same media type. Can you, for the sake of testing, connect two copper or two fiber ports ?
01-14-2019 05:22 AM
Missed that guideline page 149 of the admin guide
Every LAG has the following characteristics:
All ports in a LAG must be of the same media type.
I made a LAG with port 15 & 16, both fiber, no issue.
Surprised that there is no validation during the configuration.
I have two others pairs of SG550XG where the mixed LAG is working, the 3 pairs had the same configuration.
THANKS @Georg Pauwen
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