We changed our privacy policy. Read more.

Questions tagged [cisco-catalyst]

A tag for questions related to Cisco's Catalyst line of switches.

Filter by
Sorted by
Tagged with
9
votes
2answers
3k views

3750G Switch Buffer Monitoring

We have put some 3750Gs in a stack for our DC access switches. We are concerned that these won't be able to handler higher data loads as traffic increases due to their limited buffers. What statistic/...
9
votes
4answers
3k views

Switch interface config for IP Phones

I have seen both of the following methods of switch interface configuration for supporting IP Phones. switchport access vlan <data-vlan> switchport voice vlan <voice-vlan> switchport ...
7
votes
4answers
3k views

Cisco Catalyst 4500E - modules installation

I have the following questions on Catalyst 4500E hot-swappable hardware components; Is it possible to insert/pull out line cards to or from powered on chassis? Is it possible to insert redundant ...
5
votes
2answers
2k views

Cisco active/standby FWSM pair went active/active after switch upgrade

PROBLEM: Both FWSM in our core switches went active/active and protected subnets have partial accessibility. SETUP: We have 2 x Cisco Catalyst 6509 switches running IOS version 12.2(18). Each ...
48
votes
24answers
98k views

How can I see which switchports are not in use?

On a large Cisco Catalyst switch stack, almost all switchports are patched. I need to identify the ports, which are not in use, for connecting further devices. Following switchports, cabling, patch ...
24
votes
10answers
293k views

How to find the port a device is connected to, based on IP, on a Cisco Catalyst switch

On a Cisco Catalyst switch, I need to find what port an end device is connected to. I have the IP address/host name. How do I quickly find the port?
7
votes
2answers
934 views

Netflow differences between IOS 12.2 and 15.1

Has anyone upgraded their cisco routers from 12.2 to 15.1? I'm curious to know what kind of changes were made to netflow. Most specifically, I'd like to know how (if at all) the CPU utilization ...
7
votes
2answers
2k views

Cisco Catalyst cluster heartbeat switch issue - increasing input errors

PROBLEM: The servers in two clusters keep losing heartbeat connectivity with each other thus causing database outages. Outages are brief but disruptive. SETUP: There are two clusters of three ...
8
votes
3answers
4k views

Using Fabric on a Cisco device : "Line has invalid autocommand"

I wasn't sure where to ask this but it seems to be something on the switch side so I thought I would start here first. I am working on a little project to automate updates to config files in bulk ...
9
votes
4answers
3k views

Overcome 2 monitor session limitation in Cisco VSS

Is there a way to overcome Cisco's 2 monitor session limitation on a VSS 6500 without the use of a network tap?
11
votes
2answers
5k views

catalyst 3750x - jumbo frames on svi

I've encountered a problem on a cisco ws-c3750x-48ts-s where jumbo-frames won't cross a trunk-connection between a vwmare esx-host and the switch. The access ports in the same vlan don't experience ...
7
votes
3answers
765 views

Can I run FCoE over Cisco Catalyst 5500?

I have 2 spare older Cisco Catalyst (not Nexus) 5500 switches. Would I need any additional hardware in order to run Fibre Channel over Ethernet (FCoE) over them? Do I need some kind of management ...
11
votes
3answers
7k views

What are the alternatives to OTV for stretching a layer 2 network across 2 datacenters?

We want to find a "safe" way to stretch layer 2 network across 2 data-centers, and since we don't have any equipment running NX-OS on either data-centers we can't use OTV. So what are the alternatives ...
16
votes
5answers
78k views

What causes total output drops on a cisco switch interface?

I have an HP c7000 blade chassis which contains Cisco 3120X and Cisco 3120G switches running ios 12.2(58)SE1. The blades themselves are very lightly loaded yet many interfaces on different blade ...
13
votes
2answers
22k views

How can I verify QoS DSCP marking on a Cisco Catalyst 4500E?

Good afternoon, I've got a shiny new 4500E running 15.0(1r)SG7 that is set to replace an ailing 3750E. It is running ipbase for now. On the 3750 I was able to check out the incoming DSCP/CoS values ...
19
votes
3answers
4k views

What is the difference between all the switching modes on 6500/7600?

On one of my routers, I see the following switching modes: #show fabric switching-mode Global switching mode is Truncated dCEF mode is not enforced for system to operate Fabric module is not ...
23
votes
4answers
9k views

Can I use a Catalyst 2960-S for iSCSI?

I need to set up a modest iSCSI SAN with a few ESX hosts and one storage array. Can I get by using a Catalyst 2960-S or do I need to upgrade? Are there any special tweaks I need to make to the switch ...
21
votes
4answers
21k views

Troubleshooting "Down BGP" connections

Our network experienced a short outage when one of our BGP routes went down for a short time yesterday. Thankfully our connections failed over to our secondary BGP route after a few minutes, and the ...

1
3 4 5 6
7