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?
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