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Questions tagged [cisco-catalyst]

A brand of network switches by Cisco Systems.

113 questions
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2 answers

What is this item that came with my Cisco switch?

We just received a new Cisco Catalyst 2960, and in the box came an item we've never seen before. Interestingly enough, the documentation shows an image of the object, but it is not listed anywhere else in the guide (including the legend, which is…
newmanth
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Encryption over gigabit carrier ethernet

My conclusion to this was to pipe VLAN trunks through EoIP tunnels and encapsulate those in hardware assisted IPSec. Two pairs of fairly inexpensive Mikrotik RB1100AHx2 routers proved capable of saturating a 1 Gbps connection while adding…
Roy
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10
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3 answers

Native VLAN mismatch and missing VLAN?

I'm trying to wrap my head around what exactly is going on here with a new site's configuration of their networking stack. This particular piece I am working is pretty simple but I having a hard time figuring out what the original intention was.…
user62491
9
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2 answers

HP to Cisco spanning tree root flapping

Per a recent question I recently configured both my HP (2x 2900) and Cisco (1x 3750) hardware to use MSTP for interoperability. I thought this was functional until I applied the change to the third device (HP switch 1 below) at which time the…
Tim Brigham
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9
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2 answers

Is my Cisco switch port bad?

I've been chasing a packet-loss and network stability issue for a handful of end-users on an internal network for the past few days... These issues surfaced last week, however the location was struck by lightning six weeks ago. I was seeing 5-10%…
ewwhite
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7
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1 answer

High latency/drops between Cisco switches in two locations. How to troubleshoot?

I'm receiving user complaints about poor network application performance between two parts of a large warehouse facility. The software is a curses-based terminal application running on a Linux server. The clients are PCs running a telnet or SSH…
ewwhite
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6
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6 answers

I have a Cisco Catalyst 2940 and want to connect to it via the network. How to find its IP address?

Since my computer has not serial port, the serial cable is of no help. Does the Catalyst 2940 acquire an address via DHCP? At least my DHCP server doesn't show any address which has been requested recently. Maybe the Catalyst has to be reset first?…
Holger Jakobs
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5
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Setting spanning tree link "priorities" in Cisco switches

I've got a pair of C2960G-48 switches (running IOS 12.2(46)SE, if it makes a difference) with redundant trunks in place. On these switches there are a bunch of VLANs that carry quite heavy traffic at times (enough to completely saturate the trunks…
womble
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3
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1 answer

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 in turn relays to another system for traffic…
Thomas Ward
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3
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1 answer

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 ip address 172.17.0.1 255.255.252.0 ! interface…
Metalshark
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3
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1 answer

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 on it, it was only $75 in 2010). It came with…
crc32
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3
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1 answer

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 executed in config mode with the following…
Ammar Lakis
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3
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2 answers

How to push configurations to multiple Cisco Switches

Assume I have around 50 Cisco IE2000 Switches connected together and I want to reconfigure some settings, the same settings for every switch. Normally I would open a command line session via Putty and paste the commands. But as the number of…
nixda
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3
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Configure spanning tree from HP to Cisco hardware

I have three switches I'd like to configure in a loop - a Cisco stack (3750s) and two HP 2900 series. Each is connected to the next with a 10 gig backplane of one form or another. How do I configure the spanning tree on these systems to make this…
Tim Brigham
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3
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2 answers

I can't display running-config on cisco catalyst at privilege 15

Note: All password have been replaced or redacted. I'm trying to create a (rancid repo) account that can use the command "show run" without enabling and using a second password. Right now, I add user lion with the command "username lion privilege 15…
gozu
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