I have a 4510E iand a 3750 with 4 stacked switches in a lab environment . On the 4510, I have g1/48 configured as switch mode access port and switch access vlan 182. On the 3750, I have port Fa1/17 configured the same way. I rebooted the 4510 and then port g1/48 was disabled and port fa1/17 went into errdisable mode. The strange thing is that before I rebooted the 4510, the uplink between the two switches was working just fine. I have recently update the IOS on the 4510 and that was before I rebooted it.
Any thoughts as to why this issue is happening?? Why do the ports go into errdisable when they are uplinked while configured as switchport access?
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Like Leo, my first guess would be BPDU Guard. Do you have an internal syslog configured? If so, did you check it for any messages about the port?
Correct. The BPDU Guard is enabled; however, a former eng. setup the ports that way and I was planning on changing those 2 ports to Trunk ports rather than access ports. Changing the ports to trunk ports is pretty straight forward!
The one thing that I would like to get clarification on is, if configuring the ports as L3 ports, do I need to configure them as access ports? The answer to me should be "NO" but I want to make sure that my understanding was correct.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...