I've problem with port-channel.
The link between WS-C4507R-E and WS-C3508G-XL is a port-channel, and configuration is the following.
WS-C4507R-E
interface GigabitEthernet1/10
switchport access vlan 166
switchport mode access
load-interval 30
channel-group 11 mode on
!
interface GigabitEthernet1/11
switchport access vlan 166
switchport mode access
load-interval 30
channel-group 11 mode on
!
Graduate4507#sh etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
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
------+-------------+-----------+-----------------------------------------------
1 Po1(RU) - Gi1/1(P) Gi1/2(P)
2 Po2(RU) - Gi1/3(P) Gi1/4(P)
11 Po11(SU) - Gi1/10(P) Gi1/11(P)
WS-C3508G-XL
interface GigabitEthernet0/1
port group 1 distribution destination
no cdp enable
!
interface GigabitEthernet0/2
port group 1 distribution destination
no cdp enable
!
192.168.166.2#sh etherchannel summary
Flags: d - default D - down
I - in use
Group Ports
----- -----
1 Gi0/1(Id) Gi0/2(I)
I did shut down G0/2 on WS-C3508G-XL for solving some problems.
And then the link of G0/1 is up and down on certain times.
After G0/2 is up, the problem is gone.
G0/1 and G0/2 is directly conneted to 4507.
I wonder this is a problem with port-channel or not.
