I'm having an issue where whichever port I add last to an etherchannel
between Cat1 and Cat2 will continually bounce. Configuration looks correct;
is this a hardware issue?
Cat1:
interface FastEthernet0/23
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 12 mode desirable
!
interface FastEthernet0/24
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 12 mode desirable
!
interface Port-channel12
switchport trunk encapsulation dot1q
switchport mode trunk
Cat1(config)#do sh eth sum
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
12 Po12(SU) PAgP Fa0/23(P) Fa0/24(P)
Cat2:
interface FastEthernet0/23
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 12 mode desirable
!
interface FastEthernet0/24
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 12 mode desirable
!
interface Port-channel12
switchport trunk encapsulation dot1q
switchport mode trunk
Cat2(config)#do sh eth sum
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 3
Number of aggregators: 3
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
12 Po12(SU) PAgP Fa0/23(P) Fa0/24(P)
23 Po23(SU) LACP Fa0/19(P) Fa0/20(P)
24 Po24(SU) LACP Fa0/21(P) Fa0/22(P)
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