可能是无法设置双工为full，即便接口上设置为full也不行。但是etherchannel是可以正常up的，虽然显示是half，检查一下配置的情况吧
---
interface Port-channel1
no switchport
ip address 10.1.0.10 255.255.255.0
!
interface Port-channel2
no switchport
ip address 10.1.2.10 255.255.255.0
!
interface FastEthernet0/1
no switchport
no ip address
channel-group 1
channel-group 1 mode active
duplex full
speed auto
!
interface FastEthernet0/2
no switchport
no ip address
channel-group 1
channel-group 1 mode active
duplex full
speed auto
!
interface FastEthernet0/3
no switchport
no ip address
channel-group 2
channel-group 2 mode active
duplex auto
speed auto
!
interface FastEthernet0/4
no switchport
no ip address
channel-group 2
channel-group 2 mode active
duplex auto
speed auto
!
sw1#show etherchannel summary
Flags: D - down P - 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
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 2
Number of aggregators: 2
Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------
1 Po1(RU) LACP Fa0/1(P) Fa0/2(P)
2 Po2(RU) LACP Fa0/3(P) Fa0/4(P)
sw1#
