Switching

Hello all, I'm having a very strange issue with a 3rd party purchased 3850 WS-C3850-24XS stack. I am using the Mgmt-vrf to manage the switch and pings work when you source from that vrf. But pinging without the source of vrf doesn't work NOR does it ...

Hi all, Could someone please explain to me why I see the things I do with MST? I have the below setup in a lab, where SW1 is configured with the lowest Cost and is the root bridge. Everything is working as expect, in regards to STP, and SW4 is Blocki...

Hi, We received a replacement supervisor and upgraded the line cards software without any issues.  We notice the firmware versions are different the supervisors devices. The replacement supervisor unit has an higher firmware version on it then the ac...

I have 4 Nexus 9300 switches.  I am trying to assign them IPs and create a VLAN.  I noticed on one of the switches the default VLAN (1) has no Ethernet ports available except for the trunk lines 47 and 48 assigned to it.  When i created the VLAN it d...

I recently got an IEM-16P expansion module for an IE-3300-8P2S and cannot get it to pass POE. I've tried the expansion module on two separate 3300 base switches with the same result.  With a 48VDC 480W power supply I can power an IE-3300-8P2S with an...

Hi , I have a switch 3750 stacked , I don't have IP-phone some of my links get up & down repeatedly (I see this in switches 2960 too) Jul 1 10:24:12.159: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/3, changed state to downJul 1 10:25:03.831: %LINK-3...

Hi, is it possible to use breakout cable QSFP-4SFP25G-CUxM in Cisco Nexus N9K-C93108TC-FX3? On the tmgmatrix.cisco.com stays it is compatible but in CCW there is no that cable option.

I am having trouble configuring the C1300 and Dell 6224 switch.On the Dell side, I received the following configuration:The assumption is that traffic in VLAN150 is tagged, and I have no problem with that. The problem is with VLAN1, which is supposed...

I'm working with a Catalyst C9500-32C on version 17.1.1. I have a QSFP-4SFP25G-CU5M module in port 2(the port is breakout enabled). Cisco Optics-to-Device Compatibility Matrix shows that QSFP-4SFP25G-CU5M is compatible with C9500-32C on version 17.1....

Hello Cisco community,  I have a Cisco 9200L.  For some reason, we have had no luck migrating from password 7 to password 6.  Each time I attempt config, it gives me an error.  I even tried a new switch for additional testing, but still gives same re...

I'm trying to fully understand the flow of L2 traffic.Lets say there are two or three intermediate l2 switches between me and my default gateway.If I understand correctly, l2 to l2 does not inspect the l3 headers, meaning the switches don't know what...

I have  a Cisco 1941 router. I only have 2 Gig ports on it. I need to connect 2 ISPs. I know I can do subinterfaces on each port. The question is how do I connect the cables for the 2 ISPs once i create the subinterface.Lets say I am going to use g0/...

Hello Expert,I'm working on a somewhat complex network design and could use your expertise. I have two sites, each with a similar setup: a firewall and a Layer 3 switch.At Site 1, the firewall is deployed in a "router-on-a-stick" configuration with t...