Questions tagged [cisco-catalyst]

A brand of network switches by Cisco Systems.

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RSPAN Monitor Session on Catalyst 2960X Issue

I'm trying to replicate traffic in one catalyst 2960X port to feed it to a Linux VM to generate a graph of inbound/outbound traffic using Netdata. So I came up with the following RSPAN configuration (...
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How to check total operating hours for Cisco Catalyst switches?

We bought about 25 Cisco Catalyst (9300 & 9500) switches and about 200+ SFPs from a distributor with whom we've had trouble in the past - i.e. they sent us refurbished hardware when we ordered new....
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How do you prove RFC 791 - Internet Protocol

We are being asked to prove we are using RFC 791 (Internet Protocol) within our network. How does one prove such a thing via documentation if there is no such document from the vendor stating as much....
user2104891's user avatar
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1 answer
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802.1q multicast blocked by Cisco router

We are using Cisco Catalyst 1000 switch (C100-16P-2G-L to be precise) and having a trouble of passing tagged multicast from one its port to another. We would like to pass it as it is (tagged), I ...
pmod's user avatar
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3 answers
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What is wrong with ESXi VMKernel Port in Active/Active configuration?

I have the below, simplified configuration: Essentially, I have an ESXi host with two physical network adapters. Each adapter plugs in to a different switch. Each switch is connected via a trunk port....
Appleoddity's user avatar
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Cisco Catalyst 2960 Allow Management from Single IP Address

Our organization was recently required to use MFA for logging into our networking hardware. We're accomplishing this by using Royal Server and Royal TS, and limiting the source IP for SSH and web GUIs ...
emike09's user avatar
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IGMP v3 JOIN sent but no traffic from switch

I'm trying to join an IGMP multicast stream from a Centos 8 machine but after sending a JOIN, there is no traffic coming from the switch. Simple connection: MUX <-----------> cisco3850 <------...
Danny's user avatar
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Unable to swap old server with new one as the switch it's plugged into is unaccessible

Hopefully the title covers this question but, it's pretty straightforward. At work, we have an old DMZ Server we'd like to replace with a newer model. Unfortunately, when we were ready for the swap, ...
Abraham Zinala's user avatar
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441 views

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 ...
JasonF's user avatar
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695 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 ...
stratocaster_master's user avatar
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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 ...
AthmaneDZ's user avatar
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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 ...
Stokkeland's user avatar
3 votes
1 answer
929 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 ...
Thomas Ward's user avatar
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323 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 "...
Tomato's user avatar
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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 ...
HK78's user avatar
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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 ...
Cyber Axe's user avatar
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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....
chicagotech's user avatar
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4 answers
13k 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 ...
morleyc's user avatar
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2 votes
2 answers
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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): ...
morleyc's user avatar
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-1 votes
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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: ...
M. Zharfan Nugroho's user avatar
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1 answer
44 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 ...
AaronS's user avatar
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1 answer
835 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,...
Becky's user avatar
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1 answer
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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 & ...
CD305865's user avatar
2 votes
2 answers
1k 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 ...
user899893's user avatar
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2 answers
2k 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 ...
IAmAliYousefi's user avatar
1 vote
1 answer
94 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 ...
Sam Orozco's user avatar
1 vote
0 answers
174 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 ...
machinica's user avatar
1 vote
1 answer
885 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 ...
Nick Young's user avatar
1 vote
1 answer
2k 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 ...
Sam Orozco's user avatar
1 vote
1 answer
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 ...
Robert Schmitz's user avatar
1 vote
1 answer
614 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 ...
Allay Desai's user avatar
2 votes
2 answers
3k 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 "...
user1812956's user avatar
1 vote
1 answer
3k 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 ...
Yashar Mohagheghi's user avatar
2 votes
3 answers
7k 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 ...
duzzy's user avatar
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0 votes
1 answer
137 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 ...
Mike's user avatar
  • 25
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0 answers
41 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 ...
bot47's user avatar
  • 327
0 votes
1 answer
7k 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 ...
DChi Shaggy's user avatar
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0 answers
166 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 ...
Hardik Joshi's user avatar
3 votes
1 answer
104 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 ...
Metalshark's user avatar
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0 answers
346 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). ...
h3rrmiller's user avatar
1 vote
1 answer
4k 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 ...
Arun's user avatar
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0 votes
1 answer
394 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 ...
Unpossible's user avatar
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1 answer
40 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 ...
Boris Epstein's user avatar
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0 answers
482 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 ...
Samuel Fernandes's user avatar
0 votes
1 answer
497 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 ...
Boris Epstein's user avatar
2 votes
0 answers
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 ...
James's user avatar
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1 vote
1 answer
978 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 ...
memyself's user avatar
  • 345
3 votes
1 answer
81 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 ...
crc32's user avatar
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1 vote
1 answer
523 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....
sardean's user avatar
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2 votes
0 answers
252 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 ...
rantsh's user avatar
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