Questions tagged [cisco-catalyst]

A brand of network switches by Cisco Systems.

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Is physical connection sufficient to register a MAC address to a switch?

I have a computer connected to an unlabeled RJ-45 port. Because it is not labeled, I do not know which switch port the computer is plugged into. My initial thought was that I could login to the ...
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34 views

Configuring multiple DHCP address pools between two Cisco 2960 switches

I have two Cisco 2960 switches, connected by a trunk, with all ports on VLAN1. I've setup one switch to have DHCP Server Port-Based Address Allocation, such that a client connected to port X always ...
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27 views

Layer 3 Interfaces on Cisco Catalyst 2960-C

I am working with a Cisco Catalyst 2960-C, and I can't see equivalent configurations to apply layer 3 interfaces. The switch is configured for routing and does routing. On a Cisco SG 300 Series, I am ...
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1answer
28 views

Unable to ping some switches

I have this situation: all switches have the same vtp domain; vtp is either transparent or on off mode; SW5 is the root bridge; all switches are visible when i execute "sh cdp neighbors"; the ping is ...
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27 views

Cisco Catalyst - plugging in a switch on an access port take down a far-away port channel

I have made a diagram at this pastebin - basically i have a production network with a pair of 6840 as my core (VSS), it has port channels to various systems. I do not use any routing protocols, VTP ...
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1answer
409 views

Cisco Catalyst “Traffic Spanning” not working, multiple methods attempted, not sure what to try next

So we have an odd setup here. Where I work, we have two Nexus 9k switches running our core network - A and B named respectively, and they have span ports which send traffic to a Catalyst 2960-X which ...
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1answer
196 views

cisco 4948 IGMP flooding on all ports

everyone Having trouble with multicast on cisco WS-C4948-10GE (MPC8540). I have two switches running: System image file is "bootflash:cat4000-i5k91s-mz.122-25.EWA9.bin" and System image file is "...
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112 views

Cisco Bridge and MAC address blocking

I have two locations connected with two Cisco 861 routers. They are connected using a bridge. The subnet is the same 192.168.100.x.The routers are on E-line connection from provider. Location A is ...
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140 views

Cisco Catalyst 3750G series PoE-48 - Private VLAN

I'm working on a Cisco Configuration for the first time and I've run into a problem where the Vlans do not appear to be working correctly, the ports on the switch should be configured to the ...
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1answer
2k views

Can't ping outside IP address

Our firewall is Cisco ASA and our switch catalyst 2960. One computer keeps having the following problem : Once for a while (in one or two days), the computer can't ping outside IP address like 4.2....
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3answers
8k views

Cisco native port has to be included in allowed vlans of trunk

I have wireless access points that have a single ethernet interface. On this interface it has a management IP address (untagged), and can create multiple SSIDs each of which can be bridged on to its ...
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2answers
14k views

LACP Trunk from Cisco to Fortinet

I am setting up a 2 ethernet trunk between a Cisco switch and Fortinet 100E firewall. So far the below is working (i can ping from Cisco 192.168.1.2 and get replies from the Fortinet 192.168.1.1): ...
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235 views

DNS static work but DNS dynamic from dhcp pool doesn't work

So we have 2 dns servers, DNS-Server-A: 20.20.33.82 (normal dns server which I don't have access to it) DNS-Server-B: 172.30.11.254 (palo alto with dns proxy) Core Switch DHCP pool configuration: ...
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1answer
29 views

Pause input counters incrementing when imaging a device through USB NIC

We keep running into issues with trying to image devices using a usb-e1000 NIC. It will get the OS on there, but then once that happens the "pause input" counter on the switch begins to increment and ...
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1answer
651 views

Guest WiFi using isolated VLAN - Cisco routing

I am attempting to setup a test environment for a guest WiFi network. My aim is to use a separate SSID on a completely different subnet and keep it totally isolated from the management subnet. So far,...
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1answer
3k views

Host flapping between switchport and Etherchannel

I've got 2 stacks of Catalyst 4506-E switches (Core01 & Core02) with a 4 link port channel (Po1) configured between them. I've got 2 routers, a 3845 and a 7206VXR connected to both Core01 & ...
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2answers
795 views

Trying to use Azure AD as LDAP server with Cisco Catalyst IP Base

We setup a WiFi system in our school and currently we are using single password to let teachers login into campus WiFi. Next Semester we want to let kids login into WiFi for in class activities. We ...
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2answers
1k views

“route” sub-command does not exits in “ip” command on Cisco 2960-S

I am new to cisco. I'm running a Cisco 2960-S and defined several VLAN on it. I like to use SVI feature and set 192.168.1.254 ip address for interface VLAN 1, 192.168.2.254 for interface VLAN 2 and so ...
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1answer
66 views

If you switch an interface's vlan does it stop traffic?

I'm configuring a cisco catalyst switch and I want to change the vlan for the all of the ports on the switch away from the default vlan 1. I know how to change a vlan on an interface, I want to know ...
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148 views

How should I use Cisco ASA 5510 and Catalyst 3550 together

So I took on a project at my job moving four separate networks into one Colo center. Currently I broken everything down from the four networks into 4 VLANS on the ASA 5510. Each are assigned IPs ...
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1answer
694 views

Correcting Time Problems - Cisco Switch - DHCP Options Daylight Savings Time

I inherited quite a network in terms of centralized or correct configuration. The prior administrators did not configure many basic services correctly and myself and my Senior Administrator are now ...
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1answer
1k views

Trouble Shooting errdisabled Cause

I have a Cisco Catalyst 3850. I added a network module with 4 gbic for fiber connection. The module is not showing any lights on either side of the connection. After the searching the depths of the ...
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1answer
2k views

Catalyst 2960-X no xmodem or tftp transfer

I tried to upgrade the IOS on a Catalyst 2960-X stack with three members. The upgrade failed and left me with three switches without bootable files. So I connect to the rommon via console using ...
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1answer
433 views

DHCP Server Port-Based Address Allocation on Cisco switch 2960-x

I am trying to configure DHCP Server on a Cisco 2960-X switch to achieve port-based address allocation. I would like the IP address assigned to any device connected to that port to be the same every ...
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2answers
2k views

cisco 5548 - version 5.2 equivalent command to “service unsupported-transceiver”

In my new cisco switch version, kickstart: version 5.2(1)N1(7) system: version 5.2(1)N1(7) In this latest IOS , it doesnt have service command. Could any one help , the equivalent command for "...
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1answer
2k views

Sending IOS .bin file to Cisco 3750 Catalyst Using TeraTerm (xmodem)

I want to Update my Cisco 3750 Catalyst IOS. I don't have a LAN Connection with the Switch,just Console Cable, so I'm using xmodem and Tera Term to send the .bin file to switch. When I go to Tera ...
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3answers
5k views

Putty blank when connected to Cisco Catalyst 3500

I'm using the normal blue RJ45 to DB9 cable plugged into my Cisco Catalyst 3500 series XL switch. That cable is connected to a serial-to-usb adapter that I got from Monoprice, and that is plugged into ...
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1answer
75 views

How Can I Have 1 Device Ignore Cisco Default Route?

I have a two building infrastructure that I need a few access point devices in Building 2 talk to the default gateway in Building 1. Each building has its own firewall. Each building is connected ...
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34 views

Why do I have to specify the subnet broadcast address?

When configuring the management IP address of managed Cisco switches, I have to specify the broadcast address of the management network next to their address AND their netmask. Of course this is ...
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1answer
6k views

Cisco switchport is solid amber

I have a port on my switch that is showing a solid amber light. I have tried to shutdown this port, but it still shows the solid amber. This switch is production critical so, I cannot reboot it ...
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134 views

FastCGI: manager (pid YYYYY): server (pid XXXX) exited with status 13

FastCGI: manager (pid 6776): server (pid 20254) exited with status 13 FastCGI: manager (pid 6776): server (pid 18918) started FastCGI: server (pid 18918): initialized I am getting above mentioned ...
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1answer
90 views

Cisco IP Redirection (static NAT?) for non existant IP Range

We are moving office and our managed service provider has let us down badly. We have a Cisco 4500 stack with 5 VLANS configured of interest. These are: interface Vlan200 description FLOOR0 Gateway ...
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224 views

Cisco 1000BaseT SFP modules in a 3750 overheating

I have a 3750 responsible for switching in my DMZ. Every once in a while one of the gigabit links will go down although ios and the server attached to it report the link is up (activity lights, etc). ...
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1answer
3k views

Logging when cisco switch restarts, shuts down, or starts up

Is it possible to log events like restart,shutdown and start in cisco catalyst 3750. Also need to log when a new user is created. I'm forwarding the logs from the cisco switch to the syslog server and ...
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1answer
351 views

Trouble Switching From non-VLAN to VLAN-Enabled Network with Sophos Gateway

Nasty conundrum here. Some background: I have a Sophos UTM ASG220 serving as gateway device for a number of networks, with a Cisco 2960 network switch, and a raft of Red Hat 6.6 servers running KVM ...
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1answer
33 views

voice vs data device authentication

When a device is plugged into a switch (let's say, a Cisco Catalyst switch) how does a switch know whether the device is a VoIP one - and subject to being placed into the voice VLAN - or some other ...
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443 views

CISCO 2960X Access Switch Issue Random Limited Connectivity Issue

I have a CISCO 2960X Access switch which is configured in 8 Stack. IOS Version 15.0.2EX4 Software Image: C2960X-UniversalK9-M The System is connected VIA the CISCO IP Phone (7942G)and and then ...
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1answer
352 views

Polycom VOIP phone seems to mask the secondary device's MAC address from a Cisco switch

When I have a Polycom VOIP phone plugged into a Cisco switch and a laptop plugged into the Polycom phone I get the following. 1) The phone goes into the voice VLAN as expected. 2) The laptop goes ...
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2k views

Cisco 3850 flooding all ports because CAM table not populated?

Encountering a strange issue with a Cisco 3850 that is in use as a core switch. It is flooding all ports on the switch with traffic. After investigating more, it appears that the CAM table is not ...
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1answer
834 views

how to setup snmptraps to automatically report ports that when down due to 'err-disabled'?

I'd like to automatically monitor all ports on my switches and get notified whenever a port goes down. So far I have to connect to each switch manually and read out the disabled ports by hand: show ...
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1answer
75 views

Consequences of blocking ports on Catalyst 4506

Several years ago, I purchased a Catalyst 4506 at a business liquidation, and it's been merrily humming along running my office network (I know it's tremendous overkill, but as I was the only bidder ...
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1answer
395 views

Cisco Catalyst 2960S boots to “MLG System”

We have a brand new Cisco Catalyst 2960S that while connected to the console during boot is booting to the following: File "flash:/c2960s-universalk9-mz.122-53.SE2/c2960s-universalk9-mz.122-53.SE2....
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0answers
216 views

IGMP Snooping limitations and when do you start to use PIM?

At a head end I've just inherited, all our multicast streams run on cisco switches with IGMP snooping enabled. Because all these streams are to be kept local and isolated we've never really looked ...
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187 views

Switch troubles - Cisco Catalyst 2950T 24

At my new workplace, thanks to the old system administrator, we have an unused Cisco Catalyst 2950T 24 (two gigabit ports, 24 100Mbit ports). It was used in a quite weird setup (the place has two ...
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1answer
2k views

Logging commands on cisco devices

I'm searching for a way to log every command executed on a cisco switch/router, I have a catalyst 2960s with lanbase image, and a catalyst 4500e with ipbase image. I've found a way to log commands ...
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0answers
1k views

How to create a link between GNS3 and a VMWare Workstation VM that is totally isolated from the physical host?

My physical host machine runs windows server 2012 R2 with a DHCP server. I have the following topology in GNS3: Windows Server is the physical machine, it is connected to both VMNet 2 and VMNet 3 ...
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2answers
72 views

Is it possible to set up a X450e-24t to handle network routing and gateway?

Good morning all! Very very junior tech support here so forgive me if this is not possible. I just started somewhere and they have a Cisco Catalyst 6509 running that they say; "Just handles network ...
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1answer
118 views

Cisco - what is the purpose of a gigabit ethernet switching module

Cisco noob here Recetly while looking for a cisco switch and router combination for my CCNA studies i won this bid for a (I added the bid to keep track of it and i ended up winning it) Cisco-4500-...
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1answer
959 views

Cisco Catalyst 3560 PoE 48 with setting interface to auto qos voip trust

All I'm trying to do is copy the running-config from a Cisco Catalyst 2560 PoE 24, to a Catalyst 3560 PoE 48. This is f0/1 from the original switch: interface FastEthernet0/1 switchport access vlan ...
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2answers
668 views

What drawbacks does VTP pruning pose?

I'm currently learning a bit about Cisco switch configuration and VLAN configuration, specifically VTP. Reading on Cisco's site, the feature of VLAN pruning appears to not be used on a switch/VTP ...