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Forum Posts
Resolved! Catalyst 9300 auto-upgrade enable
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...
Resolved! vlan double tagging
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 ...
Resolved! sub interface vlan on cisco router 881
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
Resolved! MST instance change shutting down SVIs
Hi everyone, (hopefully not a double post, first upload seemed to fail) maybe someone can help me understand a little better how MST works. Following scenario: Network set up in a star topology Core-Switch is STP root, acces switches connected via s...
I wanted to check if anyone has experienced a particular bug related to executing kron policy-lists with kron occurrences on Catalyst 9300 stacks. This issue seems to occur only on stacks with more than two members. Below is the configuration I was u...
Resolved! ISSU Support between software Trains
Have customer that is very concerned with their core network being Non Stop even for software upgrades which have been problems in the past. In researching different configurations with Chassis and dual sups the question of ISSU support comes up. whe...
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