Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

3750----Flapping between Ports

Hi

I am geeting the below erros can some one suggeest me on the same

Nov 16 17:50:28.163 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 000a.f394.1f3c in vlan 16 is flapping between port Gi2/0/6 and port Po1

Nov 16 18:09:18.119 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 000a.f394.1f3c in vlan 16 is flapping between port Gi2/0/6 and port Po1

Nov 16 18:23:23.730 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 000a.f394.1f3c in vlan 16 is flapping between port Gi2/0/6 and port Po1

Nov 16 18:33:01.236 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0007.8462.e3bd in vlan 16 is flapping between port Gi2/0/6 and port Po1

Nov 16 19:06:00.646 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 000a.f394.1f3c in vlan 16 is flapping between port Gi2/0/6 and port Po1

Nov 16 20:12:42.532 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 000a.f394.1f3c in vlan 16 is flapping between port Gi2/0/6 and port Po1

Nov 16 20:17:33.798 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0007.8462.e3bd in vlan 16 is flapping between port Gi2/0/6 and port Po1

Nov 16 20:22:18.026 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0007.8462.e3bd in vlan 16 is flapping between port Gi2/0/6 and port Po1

Nov 16 20:41:48.532 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 000a.f394.1f3c in vlan 16 is flapping between port Gi2/0/6 and port Po1

Nov 16 21:01:10.834 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 000a.f394.1f3c in vlan 16 is flapping between port Gi2/0/6 and port Po1

Nov 16 21:16:00.251 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 000a.f394.1f3c in vlan 16 is flapping between port Gi2/0/6 and port Po1

regds

ADHI

9 REPLIES
Hall of Fame Super Bronze

Re: 3750----Flapping between Ports

A device with the same source MAC-Address is connected to multiple switchports on the switch.

Often, this behavior is seen when configuring teaming/etherchannel at one end of the link w/o configuring the same at the other end of the link.

Based on the switchports listed, it seems you have an etherchannel configured in the swith (Port-channel1) but you've connected the device on Port G2/0/6 instead on the switchports making up Port-Channel1.

HTH,

__

Edison.

New Member

Re: 3750----Flapping between Ports

Hi

Thanks very much for the quick reply

You mean to say that device should be connected to portchannle 1 or you want me to configure gi2/0/6 as port channel

Thanking you in anticipation

regds

Adhi

Hall of Fame Super Bronze

Re: 3750----Flapping between Ports

If you check the members of Port-Channel1 with the command show ether sum can you see if the port-channel is up?

Care to share the output here?

Did you configure teaming/etherchannel on a device connected to G2/0/6? What kind of device it is?

__

Edison.

New Member

Re: 3750----Flapping between Ports

hi

sh etherchannel s

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: 2

Number of aggregators: 2

Group Port-channel Protocol Ports

------+-------------+-----------+-----------------------------------------------

1 Po1(SU) - Gi1/0/9(P) Gi2/0/9(P)

2 Po2(SU) - Gi1/0/1(P) Gi2/0/8(P)

Please help

regds

Adhi

Hall of Fame Super Bronze

Re: 3750----Flapping between Ports

Looks good, what's connected on 2/0/6, 1/0/9 and 2/0/9?

__

Edison.

New Member

Re: 3750----Flapping between Ports

hi

1/0/9 and 2/0/9 are port channeles connected COred DC

2/0/6 is trun link and again it is pointing to core DC

regds

Adhi

New Member

Re: 3750----Flapping between Ports

Hi

In addition to above all thse ports leads to one of DC (6500) catalyst switch.

However I did log onto Core-DC and see that there are some duplicate addresses referenced. If you look at the mac addresses these are associated with the MSFC routers. It would appear to me that there is some problem in the MSFCs. I'm not sure exactly what the issue is at this point. Although the logs are being overwritten I am assuming this has been happening for longer than just today.

Core-DC-1#sh ip int brief

Interface IP-Address OK? Method Status Protocol

Vlan1 172.16.1.50 YES NVRAM up up

Vlan2 172.19.19.50 YES NVRAM up up

Vlan10 172.17.10.2 YES manual up up

Vlan14 172.17.14.2 YES manual up up

Vlan16 172.17.16.2 YES manual up up

Vlan18 172.17.18.2 YES manual up up

Vlan38 172.17.38.2 YES manual up up

Vlan50 172.17.50.2 YES manual up up

Vlan51 172.17.51.2 YES manual up up

Vlan52 172.17.52.2 YES manual up up

Vlan53 172.17.53.2 YES manual up up

Vlan54 172.17.54.2 YES manual up up

Vlan68 10.68.1.2 YES manual up up

Vlan128 172.17.128.2 YES NVRAM up up

Vlan171 172.17.1.2 YES NVRAM up up

Vlan172 172.17.2.2 YES manual up up

Vlan200 10.201.1.37 YES manual up up

Vlan201 10.201.1.41 YES manual up up

Vlan202 10.201.1.45 YES manual up up

Core

Adhi

Hall of Fame Super Bronze

Re: 3750----Flapping between Ports

It seems those 3 ports were configured as etherchannel in Core DC and they need to be configured as etherchannel on the switch you are seeing the error.

__

Edison.

New Member

Re: 3750----Flapping between Ports

hI

cOULDNT GET THE ANSWER, COULD YOU PLEASE EXPALIN IT IN BRIEF

REGDS

KARTIK

4057
Views
0
Helpful
9
Replies