Welcome to the Cisco Community Ask Me Anything conversation. Submit your questions from Monday, February 2, 2026, through Friday, February 20, 2026. Our colleagues Amruta Navadagi, Anaya Kalawat, and Mohammad Mehtabuddin will be waiting to assist you...
I am verifying an inventory for a client for which my company is upgrading the network equipment. I have a few serial numbers without the model number on my inventory and wanted to know how I can look up a device and get the model number. I do not ha...
Hi. We have some challanges with the memory utilization. Whith the command : show platform software status control-processor brief, we are getting : "1-RP0 Warning". Frst thing that has been done is to get the telemetry connection status "active", it...
We have a stack of 5 x 3850 switches. 3 switches are model WS-C3850-48T and 2 are model WS-C3850-24XS. Stack:Switch 1 - 3 WS-C3850-48TSwitch 4 - 5 WS-C3850-24XS The stack also has stack power (2 rings) configured. We would like to remove Switch 3 fr...
Hello,I have a C9300-48U stack running software version 17.03.03 and will be adding another switch to the stack in the near future. I want to know if the new switch will automatically upgrade to the running software version (17.03.03) of the stack. ...
Hello, I have read a little about the vlan hopping attack, especially the double tagging.One of the conditions is that the atacker switch port has to be configured in access mode in the same VLAN as the native VLAN off the trunk port.I tried to repro...
I have a customer who want his Dagobah and Swamp Revision revisions to match. The cat 4000s have the same ROM version, but different revisions. I don't know what to tell him what the Dagobah Revision and Swamp Revisions mean.
Please forgive the newbie question.In looking at LED Description for the Cisco Service Module in the Installing the Cisco C-SM-16P4M2X or C-SM-40P8M2X EtherSwitch Service Module, When looking at SFP/SFP+ LEDs Status description the entry for "Solid A...
I recently replaced the core switch at one of my sites that consisted of two separate C9300-48Ts and three other off brand switches and installed a new stack with a C9300X-48HX, C9300-24S and a C9300-48T (running 17.12.5). This is a layer 2 network c...
Hi guys, I'm just very curious about the specific catalyst switch model that can be managed in Meraki. I have attended a session where the C9200L, C9300, etc. can now be managed by Meraki. Does it mean, do I need a license for that (I mean the licens...
Hi All, Is anyone aware of any bug on the Catalyst 9K series..IOS 16.09.02...i've got a multiple 9200/9300 series on my network that seem to go into ssh disabled mode after a reboot. we are able to reconnect once we made the following changes via c...
Hello guys, Two questions: 1) double-tagging work in one direction What would be the reason of performing this type of attack ? DoS? 2) Works when attackers pc is connected a switch port that resides in the same VLAN as the native VLAN of the tr...
Hi,do I need to reboot a switch for changes to apply after I change region and MST VLAN mapping. Thanks
Hi all, I'm having some trouble configuring dot1x on my switch. I'm new to the cisco world but it would seem the documentation is misleading or incorrect regarding the reauthentication commands. I am running IOS version 15.0.2SE9 and the following ...
hello panel i would like to know if it is possible to create vlan sub interfaces?i use cisco routeur 881
I have a problem with my VLAN when it is on the interface I no longer have internet
