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
Does C9500-48Y4C-A support both SFP and SFP+ RJ45 module? Have checked the https://tmgmatrix.cisco.com/?npid=50 Cisco Optics-to-Optics Interoperability Matrix for combability, it is on the list. But from Cisco commerce online configuration, there is ...
Good morning,we're using two standalone C9500 switches. Now we want to connect a NAS with its network ports to both switches.So, NIC 1 on the NAS goes to Switch 1, and NAS NIC 2 goes to Switch 2.Can this be implemented without switch stacking?
Hi Everyone,In enterprise LANs, I usually enable DHCP snooping for security — but it sometimes causes issues if trust is not configured correctly on uplinks. Quick questions:Do you enable DHCP Snooping by default on all access VLANs?Do you also use I...
Hello,I have nexus 9380 pre-configured with monitor session 1 and 2 for SPAN.Session 1 shows source as all port channels destination interface eth1/2Session 2 has source all vlans > destination interface eth1/20Now when am creating a session 3 and ad...
C1300-48T-4X(unit-id1) and C1300-24T-4X(unit-id2) form a stack configuration.(version : 4.1.6.54)If C1300-48T-4X(unit-id1) is active and C1300-24T-4X(unit-id2) is standby,Reload only C1300-48T-4X(unit-id1).As a result, C1300-24T-4X (unit-id2) may be ...
Hi Cisco Community,I wanted to ask about your approaches to troubleshoot Spanning Tree Protocol (STP) flapping in enterprise networks.In some cases, I’ve seen ports constantly changing between blocking and forwarding, which causes disruptions to user...
Hi Cisco Community,Last week we faced an unexpected issue in our network. Users were complaining about slow responses and intermittent outages. On checking one of the Catalyst switches, CPU utilization was spiking around 95-99%.Steps we tried:Checked...
Hi All,I came across an interesting situation while expanding our access layer.The Problem:We added a new Catalyst 9300 switch to an existing network (distribution + multiple access). As soon as it was connected, a bunch of access ports went into a b...
I am facing a technical challenge and could really use your expertise. I need to establish a wired network connection between two points 140 meters apart, well beyond standard 100m limit forEthernet.Key Details:Outdoor installation (connecting two se...
Resolved! VRRP timers learn - best practice?
Hello all,Because VRRP timers have to match on all the switches in the group, is it a best practice to configure vrrp timers learn on all VRRP switches in the group? Conversely, is there a scenario where vrrp timers learn would NOT be a good idea?
Hello everybody.On a Catalyst 3560 I have these messages showing up:882492: Oct 20 10:14:28: %ILPOWER-7-DETECT: Interface Gi0/27: Power Device detected: Cisco PD882493: Oct 20 10:14:29: %ILPOWER-5-POWER_GRANTED: Interface Gi0/27: Power granted882494:...
Resolved! E!3200 - SD card change ?
Hi! we used to set up the SD card using Windows 10 or 11...it now does not work with those OS'es. But it works using Linux format. Any explanations ? Thank you very much
I'm trying to allow UPnP ( I know - bad, don't do it, unsafe blah blah) on a single vlan dedicated to gaming. I've got a pfsense firewall with upnp enabled handling all traffic for this vlan to the internet. access switch (VLAN122) -> Core Switch ...
Resolved! H/W version mismatch 9200
Hello,I have a stack of 4 switches,C9200-L-24P-4X (2)and C9200-24P-4G (2)when I run the command show switch stack-mode; it shows the all members have a version V01 but the fourth one has V03.. so if i upgrade the stack using the install command woul...
