Switching

How to add new QoS on 3850 when Auto-QoS is used by Cisco Ip phone

On Cisco 3850 switches, when configuring a port for Cisco IP phone, the built-in Auto-QoS is used. It's composed of service policies for input: AutoQos-4.0-Cisco-Phone-Input-Policy and for output: AutoQos-4.0-Output-Policy. So, when we want to add Q...

Only seeing broadcast traffic on cisco 3750 monitoring port

I am not a network engineer but I am the one stuck trying to get the port monitoring to work.I have a switch with three regular ports and one monitoring port port 1 is in vlan 100 and in connected to an external switch. There is an ACL for incoming ...

Resolved! How to create multiple subnet on the same router and let devices on different subnet ping each other?

Hi, I am using CISCO packet tracer to simulate a network, say I have PC1, PC2, and Router1 I connect PC1 to FastGigabitethernet0/0/0 on Router1 and connect PC2 to FastGigabiteEthernet 0/0/1 on Router1 1) I want to create 2 subnets on router: 10.0.1.0...

Nexus 9504 - MACSEC problem

Hi, Got a 9504 with a N9K-X9732C-FX card and trying to enable MACSEC on a trunk port but I get the error: macsec is not supported on module 2 (Module 2 is the X9732C card). I have checked the spec for the card on Cisco site and it says "Yes" that...

What is Difference between catalyst 9000 vs nexus 9000

Hello, Everyone.Can anyone Guide me what is the difference between catalyst 9000 and Nexus 9000?Where we use in the network and Features of Catalyst 9000 and Nexus 9000.

Switch and SFP Compatibility

Hello,I'm having trouble finding some information. I have a CSG-2520-16S-8PC ethernet switch, and I was wondering if it is compatible with Cisco GCL-SX-MMD SFP Modules? Thank you

Question on the command "mls qos srr-queue input" command that is not supported on 2960X switch

HI everyone,Good morning. Hope you can help. One of my 3560E old switch crashed and we got a 2960x as a replacement. I found out that the "mlsqos srr-queue in put" command in global config will not be taken by the new 2960X switch. The following is t...

Outbound ACL on Nexus 9348 port

Hi,Hoping for a little help here. I'm trying to restrict traffic from certain vlans to a licence dongle server. To make it easy, I've gone with a nice simple extended access list in a lab. I want to stop host2 (10.10.10.2) from pinging host1 (10.10....

Resolved! 3850 switch stack

I am stacking 2nd 3850 to existing production switch. Both has the same iOS. all the basics are covered but just having 2nd thought that Is there anything I should be aware of or missing anything??? Any expert advise?

ARP aging time is not reset

Hello everyone! The problem:We have about 1500 access switches with managment vlan.Network scheme is attached below.ARP aging time is not reset to zero with existing traffic in management vlans. We have OpenNMS which pings hosts every minute + takes ...

Resolved! Dot1q Encapsulation on Access Ports

Some switch models require the command "switchport trunk encapsulation dot1q" to be set on a port prior to enabling the port as "switchport mode trunk".My question is:1.) What are the specific ramifications that occur (if any) of leaving "switchport ...

Static DHCP in VRF Issue

Hi I try to configure on a 1921 Router with SW Rev. c1900-universalk9-mz.SPA.151-3.T1.bin a VRF DHCP Pool with Static ReservationThis is my configip vrf OFFICE rd 200:2 route-target export 200:2 route-target import 200:2!ip dhcp excluded-address vrf ...

Resolved! Best way to configure redundant interfaces on a router

Let's say you have 2 routers for redundancy connected to 2 switches for redundancy (so each switch connects to each router). If I need the same sub-interfaces on each interface on the router since they are providing redundant connections for each swi...

MAC address issue

Hi All, Need some help on the below issue : Switch WS-C3850-48P, stack of 3. I wanted to add a MAC address to the MAC access list but messed up: I used >> mac access-list extended Allowed-User-MAC-ACL-IN permit xxxx.xxxx.xxxx ffff.ffff.ffff any...

Resolved! C2960X PoE issue

Need to ask if anyone has ran into an issue that if 6 devices are connected in consecutive order? Co-workers have some switches that when they connection 6 IP Cameras on consecutive ports (17-22), port 18 and 20 do not power up.. This was duplicated ...