Hi - I'm just labbing for ICND2 and wanted to connect a Router to Switch etherchannel through 2 ports on each device, but now having recurring error message:
*Mar 1 02:05:11.452: %SW_MATM-4-MACFLAP_NOTIF: Host XXXX.XXXX.XXXX in vlan 1 is flapping between port Fa0/1 and port Fa0/2
*Mar 1 02:12:03.987: %SW_MATM-4-MACFLAP_NOTIF: Host XXXX.XXXX.XXXX in vlan 1 is flapping between port Fa0/2 and port Fa0/1
So I have Router: G0/0 connected to Switch: F0/1 and G0/1 connected to Switch F0/2.
The Router has aggregated its two ports into 1 channel (so I think that end is configured correctly); but the Switch doesn't look too healthy as port channel is in shutdown. Any idea where I have gone wrong please?
Switch#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
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SD) LACP Fa0/1(I) Fa0/2(I)
the config for the Switch below:
Switch#sh run
Building configuration...
Current configuration : 1375 bytes
!
version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Switch
!
boot-start-marker
boot-end-marker
!
!
!
!
no aaa new-model
system mtu routing 1500
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
interface Port-channel1
!
interface FastEthernet0/1
channel-group 1 mode active
!
interface FastEthernet0/2
channel-group 1 mode active
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
< --- SNIP! ---->
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface Vlan1
ip address 192.168.1.254 255.255.255.0
no ip route-cache
!
ip default-gateway 192.168.1.1
ip http server
ip http secure-server
!
line con 0
exec-timeout 0 0
logging synchronous
line vty 0 4
login
line vty 5 15
login
!
end
The config for the Router:
Router#sh run
Building configuration...
Current configuration : 970 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
ip cef
!
voice-card 0
no dspfarm
!
interface Loopback0
ip address 10.0.0.1 255.255.255.0
!
interface Port-channel10
ip address 192.168.1.1 255.255.255.0
hold-queue 150 in
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
channel-group 10
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
channel-group 10
!
interface Serial0/2/0
no ip address
shutdown
no fair-queue
clock rate 2000000
!
interface Serial0/3/0
no ip address
shutdown
clock rate 2000000
!
ip forward-protocol nd
!
!
ip http server
no ip http secure-server
!
control-plane
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
login
!
scheduler allocate 20000 1000
!
end
