03-19-2014 07:11 AM - edited 03-07-2019 06:46 PM
Hello,
we are having a "suspend" issue to portchannels with 2960S switches only.
On our core switch we have the following setup:
interface Port-channel68
description EC DELEJ02SAC88
switchport
switchport trunk allowed vlan 6,7,10-12,19-21,30,63
switchport mode trunk
and the two ports are:
interface GigabitEthernet1/3/10
description SAC88
switchport trunk allowed vlan 6,7,10-12,19-21,30,63
switchport mode trunk
logging event link-status
udld port aggressive
channel-group 68 mode active
!
interface GigabitEthernet2/3/10
description ECM DELEJ02SAC88-D20
switchport trunk allowed vlan 6,7,10-12,19-21,30,63
switchport mode trunk
logging event link-status
udld port aggressive
channel-group 68 mode active
On the other end we have a stacked 2960s with two switches.
Ports are configured as this:
interface Port-channel1
description Uplink Core
switchport trunk allowed vlan 6,7,19,21
switchport mode trunk
and the two stack ports (one of each switch):
!
interface GigabitEthernet1/0/49
description Uplink Core/Chassis1
switchport trunk allowed vlan 6,7,19,21
switchport mode trunk
udld port aggressive
mls qos trust dscp
channel-group 1 mode active
and
interface GigabitEthernet2/0/49
description Uplink Core/Chassis2
switchport trunk allowed vlan 6,7,19,21
switchport mode trunk
udld port aggressive
mls qos trust dscp
channel-group 1 mode active
Same configuration we do have on our not stacked 2960 and is working fine. But here we have one port in supended state:
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Gi1/0/49(P) Gi2/0/49(s)
We don't have anything in the logs.
Do anybody came across with this issue or having nay idea how to fix it?
Many thanks in advance
03-19-2014 07:53 AM
Verify your ports are correct , you have different descr on the 4500 on the ports so i would verify they go where you think. Trace them and or use CDP to verify they go where you think . Config looks ok though i would match the allowed vlans on both sides to keep it consistent. Look in the logs also , it usually gives an indication why it is suspending the ports.
03-19-2014 08:15 AM
I met similiar problem on C4500.
Try to remove etherchannel configuration by taking ports to it's defaults and also interface Port-channel68.
Then create port channel interface by first issuing :
interface GigabitEthernet1/3/10
description SAC88
channel-group 68 mode active
!
interface GigabitEthernet2/3/10
description ECM DELEJ02SAC88-D20
channel-group 68 mode active
Then configure all stuff around switchport under interface Port-channel68.
03-19-2014 08:43 AM
Hi guys,
thanks for quick respond. CDP neigh allready checked, connected to the right ports.
I will try removing / adding port channel on core but have to wait getting a time window from site.
THX
04-07-2014 01:12 AM
Did you get it worked?
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: