cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
462
Views
20
Helpful
7
Replies

switch-port

Mohamed Sobair
Level 7
Level 7

Hi All,

I have 2 ports on my current 3560-Sw connected to a Microwave device, The ports were set to trunks & they are part of port channel to load balance data traffic. (Purely layer 2 Vlans).

Now my issue is, the ports most of the time went to err-disable state, when I issue (shutdown) & (no-shutdown) commands, it works...

What could be the cause of this issue??

Appreciate your feedback,

7 Replies 7

ankbhasi
Cisco Employee
Cisco Employee

Hi Friend,

There are few reasons why the switport goes into errdisable like dtp-flap, gbic-invalid, link-flap, and pagp-flap.

A cause (dtp-flap, gbic-invalid, link-flap, and pagp-flap) is the reason why the error-disabled state occurred. When a cause is detected on an interface, the interface is placed in error-disabled state, an operational state similar to link-down state. If you do not enable errdisable recovery for the cause, the interface stays in the error-disabled state until you enter the shutdown and no shutdown interface configuration commands. If you enable the recovery for a cause, the interface is brought out of the error-disabled state and allowed to retry the operation again when all the causes have timed out.

Use the errdisable detect global configuration command to enable error disable detection.

Check this link for more details

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225seb/cr/cli1.htm#wp1964832

HTH

Ankur

m.sir
Level 7
Level 7

What is reason of err-disable state (should it be in log)

you can turn off err-disable with command:

no errdisable detect cause all (or select your cause)

or you can turn on errdisable recovery with command:

errdisable recovery cause all (or select your cause)

M.

Hope that helps rate if it does

vijayasankar
Level 4
Level 4

Hi,

Check this URL for possible reasons for the err-disable state.

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094647.shtml#errdisable

For this scenario you should use LACP (802.3ad)

Check whether your microwave device supports LACP.

Check out this URL for guidelines to follow while configuring etherchannel.

http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration_guide_chapter09186a00801cdf51.html#1021856

Hope this helps.

-vJ

Hi All,

Thank you all, I have done the recovery commands, it works fine but I have one last inquiry;

I noticed it recovers the (err-disabled) ports after about 2 minuites or some thing;

Is there any way to make it recovers very fast?

Thanks,

Hi

Use command "errdisable recovery interval x"

where x is time to recover from a error-disable cause.

Minimum is 30 seconds

Hope this helps

Hi Friend,

The link which I pasted in my previous post explain your requirement.

Check this out again and check the section and explaination for interval section.

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225seb/cr/cli1.htm#wp1861525

HTH

Ankur

Guys,

I am very greatful,

Appreciate your quick response,

Thanks Again.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Innovations in Cisco Full Stack Observability - A new webinar from Cisco