Hi Team,
I have a problem here regarding the port-channel. 2nd Interface not bundle in the port-channel and I get vlan flapping inside network and the connection become lost and back up again. I tried to remove everything and create new port-channel and tag to another interface it still the same, it become stand-alone. is there something that i missed? I simulate it on GNS3 lab, but there is nothing wrong with the config. now i'm stuck. my configuration as per below;-
C3850-DC-SW#
C3850-DC-SW#sh run int po100
Building configuration...
Current configuration : 397 bytes
!
interface Port-channel100
description ****2x 1Gbps Metro-E Link to HQ office****
switchport trunk allowed vlan 1,2,16,19,30,37,49,55,63-65,68,72,108,113,117
switchport trunk allowed vlan add 121,128,129,132,133,149,151,160,180,192
switchport trunk allowed vlan add 198-200,205,216,231,232,241-243,250,253,310
switchport trunk allowed vlan add 330,410,500,510,611,690
switchport mode trunk
end
C3850-DC-SW# sh run interface te1/1/1
Building configuration...
Current configuration : 541 bytes
!
interface TenGigabitEthernet1/1/1
description Metro-E Link to HQ office
switchport trunk allowed vlan 1,2,16,19,30,37,49,55,63-65,68,72,108,113,117
switchport trunk allowed vlan add 121,128,129,132,133,149,151,160,180,192
switchport trunk allowed vlan add 198-200,205,216,231,232,241-243,250,253,310
switchport trunk allowed vlan add 330,410,500,510,611,690
switchport mode trunk
channel-group 100 mode desirable
spanning-tree port-priority 240
end
C3850-DC-SW#sh run interface te2/1/1
Building configuration...
Current configuration : 541 bytes
!
interface TenGigabitEthernet2/1/1
description Metro-E Link to KLCC
switchport trunk allowed vlan 1,2,16,19,30,37,49,55,63-65,68,72,108,113,117
switchport trunk allowed vlan add 121,128,129,132,133,149,151,160,180,192
switchport trunk allowed vlan add 198-200,205,216,231,232,241-243,250,253,310
switchport trunk allowed vlan add 330,410,500,510,611,690
switchport mode trunk
channel-group 100 mode desirable
spanning-tree port-priority 224
end
C3850-DC-SW#
C3850-DC-SW#sh etherchannel summary
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
A - formed by Auto LAG
Number of channel-groups in use: 2
Number of aggregators: 2
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Te1/0/1(P) Te1/0/2(P) Te2/0/1(P)
Te2/0/2(P)
100 Po100(SU) PAgP Te1/1/1(P) Te2/1/1(I)
-------------------
HQ SWITCH
--------------------
C3850-HQ-SW#sh run int po100
Building configuration...
Current configuration : 337 bytes
!
interface Port-channel100
description **** 2x 1Gbps Metro-E Link to DC ****
switchport trunk allowed vlan 1,2,16,30,37,63-65,108,128-130,132,133,149,151
switchport trunk allowed vlan add 160,180,192,198-200,205,216,231,232,241-243
switchport trunk allowed vlan add 250,253,310,330,410,500,510,611,690
switchport mode trunk
end
C3850-LVL26-SW#sh run int te1/0/12
Building configuration...
Current configuration : 477 bytes
!
interface TenGigabitEthernet1/0/12
description Metro-E Link to DC
switchport trunk allowed vlan 1,2,16,30,37,63-65,108,128-130,132,133,149,151
switchport trunk allowed vlan add 160,180,192,198-200,205,216,231,232,241-243
switchport trunk allowed vlan add 250,253,310,330,410,500,510,611,690
switchport mode trunk
channel-group 100 mode desirable
spanning-tree port-priority 240
end
C3850-HQ-SW#sh run int te2/0/12
Building configuration...
Current configuration : 407 bytes
!
interface TenGigabitEthernet2/0/12
description Metro-E Link to DC
switchport trunk allowed vlan 1,2,16,30,37,63-65,108,128-130,132,133,149,151
switchport trunk allowed vlan add 160,180,192,198-200,205,216,231,232,241-243
switchport trunk allowed vlan add 250,253,310,330,410,500,510,611,690
switchport mode trunk
channel-group 100 mode desirable
spanning-tree port-priority 224
end
C3850-HQ-SW#
C3850-HQ-SW#sh etherch 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
A - formed by Auto LAG
Number of channel-groups in use: 2
Number of aggregators: 2
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Te1/0/1(P) Te1/0/2(D) Te1/0/3(D)
Te1/0/4(D) Te2/0/1(P) Te2/0/2(D)
Te2/0/3(D) Te2/0/4(D)
100 Po100(SU)
PAgP Te1/0/12(P) Te1/1/1(D) Te2/0/12(I) Te2/1/1(D)
C3850-HQ-SW#
Jan 22 17:08:52.550 MY: %SW_MATM-4-MACFLAP_NOTIF: Host 5c80.b63c.ccd3 in vlan 500 is flapping between port Po1 and port Te2/1/1
Jan 22 17:08:52.655 MY: %SW_MATM-4-MACFLAP_NOTIF: Host 5c80.b620.98c9 in vlan 500 is flapping between port Te2/1/1 and port Po1
Jan 22 17:08:54.588 MY: %SW_MATM-4-MACFLAP_NOTIF: Host 0476.b0f1.dd18 in vlan 205 is flapping between port Po100 and port Te2/1/1
Jan 22 17:08:54.661 MY: %SW_MATM-4-MACFLAP_NOTIF: Host d8b1.9041.45a2 in vlan 205 is flapping between port Te2/1/1 and port Po1
Jan 22 17:09:02.106 MY: %SW_MATM-4-MACFLAP_NOTIF: Host 609c.9f1b.75e8 in vlan 205 is flapping between port Po100 and port Te2/1/1
Jan 22 17:09:44.154 MY: %SW_MATM-4-MACFLAP_NOTIF: Host d8b1.9041.5696 in vlan 205 is flapping between port Po100 and port Po1
