Hello, Cisco Community!I’m really happy to share that I’ll be hosting the Cisco Community Lab Series, a brand-new hands-on learning journey designed to help you build practical networking skills step by step.Every Thursday at 8 PM EST, I’ll post a ne...
Forum Posts
Resolved! Catalyst 9500 Bundled Mode Downgrade
Hello There,I am looking to downgrade a couple of Catalyst 9500 switches to 16.12.x from 17.x. Switches are running in the bundled mode. As of my understanding, in the bundled mode, you just need to change the boot variable to upgrade or downgrade. M...
I have some Cisco Catalysts 3850 switches, model WS-C3850-12X48U-S.I noticed that the airflow is currently rear exhaust. Can the fans and power supplies be replace withportside exhaust? We are moving this equipment to a data center with specific hot ...
Resolved! Keyboard Interactive authentication
I upgraded my cisco 3850 switch from 3. to 16.9 . Ones i reloaded it asking for Keyboard interactive authentication password and for switch which i dont know.How can i get back to usermode.
This is the first time i m learning networking. In netacad course book it was mentioned when a switch receives a tagged fram with same vlan id as native vlan on a trunk port, it will drop the frame.so how an attacker is sending a tagged frame with na...
Hi, I need to change the System MTU on a 3850 to the maximum value - 9198. I will have a client facing SVI also set to 9198, but then I need a service provider facing SVI to be 9000, as the service provider MTU is set to 9000 and we are running OSPF ...
Hi, I am facing a difficulty we have cisco 2960S switch. The IP telephone is not working, it gets connected and then disconnects. port connected is Gi1/0/43. If we connect direct to the switch then it works. I already updated the firmware of the swi...
Hello, I have tried copying an IOS image from USB to flash on a 3750X-48P-L Cisco switch. The switch had been part of a stack, lost power, and got caught in a boot loop. I initialized the flash and I ran the following commands: switch: di...
I ran into ping responsiveness problems on my Nexus 6ks last week. I think I know the cause - waiting for a change window to address that. But in the meantime I'd like to know - what's the least impactful means of finding out what the sources address...
Resolved! Why No Ports On Sw2 Blocked
Hello! I'm new to networking and learning in a non-traditional setting to prepare for a career change. I appreciate any help from this very knowledgeable community. A lab asked me to predict which ports would be blocked and/or assigned as RP/DP based...
The way I read (what I believe to be) the latest Catalyst 9400 Family white paper, for the C9410R, all line card slots are rated at 80Gbps each, no matter which of the current supervisor modules is used.However, my colleague consulted a Cisco archite...
Hi Guys,we have been considering buying some used Catalyst 9300/9500 for testing purposes, but we are not sure if the license level of the network stack will be maintained. So for example Network Essentials, Advantage or Premier.We have had some outp...
We currently have two floors with each floor having a stacked pair of 2960-X and we have a temporary need to add another switch for a new floor while we renovate our building. I was able to get another 2960-X to use but not sure how it should be conf...
Hi AllWhat are people doing for typical Datacentre designs these days?Is it a 2 layer or 3 layer model? or is it just spine and leaf?What about dual connecting servers using LACP etc? would they just have the 2 TOR leaf switches in a vpc then create ...
Resolved! INTERVLAN Routing
Hi There,I have a question regarding inter-vlan routing. I am currently studying this using GNS3.Please see the attached image for the simple topology.The ISP is setup to use NAT and Internet is working from DSW-2.ISP:ip nat inside source list 1 inte...
Resolved! Ripv2 Not working
Hi everybody, I can't see why my rip protocols doesn't work on this. Can anyone help me ? thank you EDIT : i found my error i forgot to add the network between the 2 router
