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Etherchannel port bundle and unbundle automatically

We are using SG300 switch. ports in etherchannel are getting unbundle   

and bundle automaticaly. kindly suggest me the possible reasons and solution for the same.

Error log:

2147475515          2013-Nov-19 15:57:04          Informational           %LINK-I-Up: g26

2147475516          2013-Nov-19 15:57:04          Informational           %TRUNK-I-PORTADDED: Port g26 added to ch1

2147475517          2013-Nov-19 15:57:02          Warning           %LINK-W-Down: g26

2147475518          2013-Nov-19 15:57:02          Warning           %TRUNK-W-PORTDOWN: Port g26 removed from ch1: port is down/notPresent

2147475520          2013-Nov-19 15:45:00          Informational           %LINK-I-Up: g26

2147475521          2013-Nov-19 15:45:00          Informational           %TRUNK-I-PORTADDED: Port g26 added to ch1

2147475523          2013-Nov-19 15:38:37          Warning           %LINK-W-Down: g26

2147475524          2013-Nov-19 15:38:37          Warning           %TRUNK-W-PORTDOWN: Port g26 removed from ch1: port is down/notPresent

2147475525          2013-Nov-19 15:38:24          Informational           %LINK-I-Up: g25

2147475526          2013-Nov-19 15:38:24          Informational           %TRUNK-I-PORTADDED: Port g25 added to ch1

2147475527          2013-Nov-19 15:35:39          Warning           %LINK-W-Down: g25

2147475528          2013-Nov-19 15:35:39          Warning           %TRUNK-W-PORTDOWN: Port g25 removed from ch1: port is down/notPresent

2147475529          2013-Nov-19 15:34:58          Informational           %LINK-I-Up: g25

2147475530          2013-Nov-19 15:34:58          Informational           %TRUNK-I-PORTADDED: Port g25 added to ch1

2147475535          2013-Nov-19 15:19:30          Warning           %LINK-W-Down: g25

2147475536          2013-Nov-19 15:19:30          Warning           %TRUNK-W-PORTDOWN: Port g25 removed from ch1: port is down/notPresent

2 REPLIES
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Etherchannel port bundle and unbundle automatically

Looks like the interface is flapping. Maybe a bad cable?

Daniel Dib
CCIE #37149

Daniel Dib CCIE #37149 Please rate helpful posts.

Etherchannel port bundle and unbundle automatically

Except it's happening with both cables so I suspect it's something else.

What is the config on the SG300?  Are the ports in an LACP or PAgP group on the switch side?  [Hint: they should't be using any protocol, but just set to 'on']

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