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Beginner

Interface "flapping"

Hello,

We have Nexus 9000 switches connected to ASA FWs, while I'm checking the log I've found the below;

%ETHPORT-5-SPEED: Interface Ethernet1/1, operational speed changed to 1 Gbps
%ETHPORT-5-IF_DUPLEX: Interface Ethernet1/1, operational duplex mode changed to Full
%ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/1, operational Receive Flow Control state changed to off
%ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/1, operational Transmit Flow Control state changed to off
%ETHPORT-5-IF_UP: Interface Ethernet1/1 is up in mode access
%ETHPORT-5-SPEED: Interface Ethernet1/2, operational speed changed to 1 Gbps
%ETHPORT-5-IF_DUPLEX: Interface Ethernet1/2, operational duplex mode changed to Full
%ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/2, operational Receive Flow Control state changed to off
%ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/2, operational Transmit Flow Control state changed to off
%ETHPORT-5-IF_UP: Interface Ethernet1/2 is up in mode access

All interface are connected using 1G UTP transceivers. I'm not able to know what is reason behind such error noting that for now in 24 hours it happened one time only but since they are hosting critical services I'm trying to specify the reason of that.

Your advise please.

7 REPLIES 7
VIP Advisor

Re: Interface "flapping"

Check the Physical Cables connected make sure they are intact. if that confirms all the cables are ok

is this port-channel?

 

try from the switch side : (traffic may have interrupted, while doing in production, do it in maintenance mode)

 

no negotiate auto

BB
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Beginner

Re: Interface "flapping"

Hello,
No this is normal access port which is not member of any port-channel.
I will plan for such test.
VIP Advisor

Re: Interface "flapping"

Hello

Check for possible power or interface resets.


sh interfaces
sh interface xx transceivers



kind regards
Paul

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Beginner

Re: Interface "flapping"

Hello,
Transceivers are OK, they are present. As for reset, I've noticed some resets on the interfaces but only 1 reset on most interface.
VIP Advocate

Re: Interface "flapping"

Hi,

You have to check some:

1. Physical Media.

2. Have you checked the Negotiation Issue? 

3. Any Power or Cable length issue?

 

Regards,
Deepak Kumar,
Don't forget to vote and accept the solution If this comment will make help you!
Beginner

Re: Interface "flapping"

Hello,
Physically things are OK so far, Negotiation is auto on both sides, switches haven't been rebooted so no power issues actually and cable length is less than 100 M.
VIP Advisor

Re: Interface "flapping"

When you mentioned they are not part of port-channel ? how these 2 interface connected to ASA ? in and Out:?

 

can you post the interface config also.

 

Both interface information.

 

show run interace ethe 0/0

show interace ethe 0/0

 

Try also no negotiation and let us know ( what ASA Model is this ?)

BB
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