Cisco – IT Blog

Red SYSTEM LED on SW-SUP720-3BXL

Once on a Cisco Catalyst 6509-E, I noticed that the SYSTEM LED on the WS-SUP720-3BXL is lit red.

Online diagnostics Cisco Catalyst 6500

In this article, I will describe the Cisco Catalyst 6500 online diagnostic commands.

WS-SUP720-3BXL does not start Not Applicable Unknown

Once after a power outage, on Cisco Catalyst 6509-E, instead of the main module WS-SUP720-3BXL, only the backup module was launched.
As I found out later, the memory card stopped working and, accordingly, the module could not start the firmware. At this moment on the module all the indicators glowed red.

List of network and network equipment emulators

I will give a short list of popular network emulators and network equipment:

How to configure SSH on Cisco

In this article I will write how to configure SSH on Cisco.

Connect to the device via telnet or console cable and switch to the privileged mode:

Configuring Cisco Catalyst 3750

On the test I will configure Cisco Catalyst WS-C3750-48TS-S with firmware 12.2(55)SE3.

View the temperature on the Cisco Catalyst 6500

I will use Cisco Catalyst 6509-E on the test.
To view the temperature of the sensors, connect via the console or telnet for example and execute the command:

List of SNMP OID and MIB for Cisco

Below is the list of SNMP OID that I used to create templates in Zabbix and other scripts.

Solution “Port is not compatible with aggregators in channel 1 and cannot attach to them”

Once on Cisco Catalyst 6509-E, when I collected an aggregation of three ports, traffic began to go through only two ports and a message appeared in the logs:

Cisco Catalyst 2960-24TT-L Firmware Update

On the test, I will upgrade the Cisco Catalyst WS-C2960-24TT-L switch.

And so, let’s connect to the switch and switch to elevated privilege mode:

enable

Let’s see the active firmware version:

show version
show boot

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