Link Layer Discovery Protocol (LLDP)

By Vikas Bagwe -

LLDP

The Link Layer Discovery Protocol (LLDP) operates on the data link layer. It stores and maintains information about the local device and the devices directly connected to it for network administrators to manage networks through NMS (network management systems). In LLDP, device information is encapsulated in LLDPDUs in the form of TLV (meaning type, length, and value) triplets and is exchanged between directly connected devices. Information in LLDPDUs received is stored in standard MIB (management information base).

Configuring LLDP

Network Diagram

Figure 1-1 Network diagram for LLDP configuration

Networking and Configuration Requirements

l          As shown in Figure 1-1, connect NMS to Switch A over the Ethernet; and connect Switch A to the MED device and Switch B through GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 respectively.
l          Configure LLDP on the interfaces of Switch A and Switch B to allow NMS to monitor the link status of Switch A.

Configuration Example

l          Configuration on Switch A
#
interface GigabitEthernet1/0/1
 lldp admin-status rx
#
interface GigabitEthernet1/0/2
 lldp admin-status rx
l          Configuration on Switch B
#
interface GigabitEthernet1/0/1
 lldp admin-status tx

Configuration Guidelines

To display the log information generated by neighbor status changes on the terminal monitor, make sure that the terminal monitor (through the terminal monitor command), log information switch (through the terminal logging command), and information center (through the info-center enable command) are enabled. 

Comments

Post a Comment

Popular posts from this blog

Linux File and Directory Permissions

By -
Image
file & directory protection is a essential of any OS and Linux OS is no exception for it! These authorizations allow you to choose exactly who can access your files & directory, providing an overall improved system security. There was one of the major flaws in the older Windows operating-system where, by standard, all users can see each other people's information (Windows 95, 98, Me). For overcoming it, editions of the Windows based computer system such as NT, 2000, XP and 2003 lot more security features added. They fully support file & directory permissions, just as Linux system has since the beginning. Together, we'll now assess a directory listing from our Lab Linux system hosting server, to help us understand the information provided. a simple 'ls' command will give you the file and directory listing within a given directory, including the option  '-l' will display number of new areas that we are going to discuss here:
Read more

How to Disable SSL for Webmin

By -
Webmin is a Web application that enables administrators to manage Linux servers. Webmin runs on a Web server at port 10000. Miniserv is the name of the Web server application that handles the Webmin Web application. By default, Miniserv uses SSL. However, you can disable SSL for Webmin Miniserv by editing the configuration file for the Web application. With SSL disabled, you can access the Webmin application over a standard HTTP connection. Step 1 Open a terminal window on the Linux server. You can also SSH into the server if you do not have physical access to the machine. Step 2 Type the following command at the command prompt and press the “Enter” key: nano /etc/webmin/miniserv.conf This command opens the Miniserv configuration file in the Nano text editor.
Read more

INSTALL CISCO VPN CLIENT ON WINDOWS 10 (32 & 64 BIT). FIX REASON 442

By -
Image
This article shows how correctly install Cisco VPN Client (32 & 64 bit) on Windows 10 (32 & 64 bit) using simple steps, overcome the ‘ This app can’t run on this PC ’ installation error , plus fix the Reason 442: Failed to enable Virtual Adapter error message . The article applies to New Windows 10 installations or Upgrades from earlier Windows versions and all versions before or after Windows 10 build 1511 .  To simplify the article, we’ve broken it into the following two sections: How to Install Cisco VPN client on Windows 10 (clean installation or upgrade from previous Windows), including Windows 10 build prior or after build 1511 . How to Fix Reason 442: Failed to enable Virtual Adapter on Windows 10 Figure 1. The Cisco VPN Client Reason 442: Failed to enable Virtual Adapter error on Windows 10 HOW TO INSTALL CISCO VPN CLIENT ON WINDOWS 10 (NEW INSTALLATIONS OR O/S UPGRADES) The instructions below are for new or clean Windows 10 inst...
Read more