If you have a network with multiple VLANS then it is important to have a descriptive name given to these VLans to identify and for ease of management.
In Cisco IOS this can be done from the vlan database configuration mode
Tag: Cisco
DHCP Relay Agent for subnets without a DHCP Server
A DHCP server is the one which provides a network client with a unique IP address, Subnet mask, Gateway and DNS server IP address automatically when it connects to the network.
A DHCP Relay Agent is a computer, server or a Router in a particular subnet which receives a DHCP client broadcast and relays it to a DHCP server in another network or a subnet. A DHCP Relay Agent is more a helper agent here that gets the client a DHCP lease.
HowTo: Show Chassis Serial Number and Part Number in Cisco Routers
In Cisco Routers, to show the Chassis Serial Number and the various network modules serial numbers and the part numbers, use the show diag command. The show diag command in Cisco IOS is used to display various Diagnostic information on Cisco Router. The command was introduced in Cisco IOS 11.2
HowTo: Cisco IOS – Clear Show Interface Counters
Sometimes, while you are troubleshooting a network problem, you may need to clear the Show Interface counters as you may need to check if there are any switch port input errors, runts, output errors, collisions,packets with dribble condition etc.
SNMP configuration on Cisco IOS for routers and switches
SNMP helps monitoring your network devices wherein it can help a Monitoring System to query the device about various system health and/or modify configurations based on the permission it has on the device or on the other hand, allow the device itself to send alerts (known as trap in SNMP) to the management system of any system issues like a PSU failure.
How to get Chasis Serial Number on a Cisco Catalyst Switch
In Cisco Catalyst switches running Cisco IOS, you can find the serial numbers using the following commands on the various models:
Nipper – Network device Security Audit tool
Nipper is an Opensource tool for network device congiguration and security audit. Nipper performs security audits of network device configuration files. The report produced by Nipper includes; detailed security-related issues with recommendations, a configuration report and various appendices. (more…)