Cisco VPN Phone Configuration
Cisco VPN Phone? Cisco Unified IP Phone? Are they the same or similar? How much do you know about the Cisco IP Phones? Well, in fact, the Cisco VPN Phone is a Cisco Unified IP Phone–based VPN solution that extends…
Category: CCNP
New Cisco CCNP Routing & Switching 2014
Cisco announced major revisions to the Cisco CCNP (Certified Network Professional) Routing and Switching certification at the end of July. All three courses: Implementing Cisco IP Routing (ROUTE), Implementing Cisco IP Switched Networks (SWITCH) and Troubleshooting and Maintaining Cisco IP Networks…
VLAN vs. Subnet
“What is the difference between a subnet and a vlan? How does a subnet and vlan work differently from each other?” “While going through the CCNP switch book of CISCO, I encountered this statement “The switch port supports one VLAN,…
Show ip route
To display the current state of the routing table, use the show ip route command in user EXEC or privileged EXEC mode. The show ip route command is a powerful tool to use at this point in your search. You…
Show processes memory
The show memory exec command is often used to check the amount of a router’s free memory. In troubleshooting cases where router performance is the focus, this is a major command used to see the statistics about the router’s memory. To show…
Configure logging in Cisco IOS
Knowing how to properly use logging is a necessary skill for any network administrator, and the Cisco IOS offers many options for logging. Logging can use for fault notification, network forensics, and security auditing. Cisco routers log messages can handle…
Show module command
Show modules: To display the module status and information, use the show module command in user EXEC or privileged EXEC mode. This example shows how to display information for all modules on a Catalyst 6500 series switch that is configured…
Show interfaces
Show interfaces: Use the show interfaces EXEC command to display statistics for all interfaces configured on the router or access server. The resulting output varies, depending on the network for which an interface has been configured. show interfaces [type number]…
Show running-config
Show running-config: To display the configuration information currently running on the terminal, use the show running-config EXEC command. This command replaces the write terminal command. Syntax Description: This command has no arguments or keywords. Command Mode: EXEC Usage Guidelines This…
Cisco Show Version Command
Show version: Displays information about the router’s internal components, including the IOS version, memory, configuration register information, etc. The most common use of the show version command is to determine which version of the Cisco IOS a device is running.…
Cisco Show Stacks Command
Show stacks is an exec command that is commonly used to diagnose system crash situations. The first section of this command’s output displays stack utilization of processes and interrupt routines, and the reason for the last system reboot. When a system…
How to Troubleshoot OSPFv3 Frame-Relay?
Open Shortest Path First (OSPFv3) is a link state protocol that supports IPv6 and as well as IPv4. OSPF version 3 differs from OSPF version 2 for IPv4 as some changes have been incorporated to facilitate IPv6. This article demonstrates how…
Basic HSRP Configuration Example On Cisco IOS XR
The Hot Standby Router Protocol (HSRP) is an IP routing redundancy protocol designed to allow for transparent failover at the first-hop IP router. HSRP provides high network availability, because it routes IP traffic from hosts on networks without relying on…
How to Configure IGRP (Interior Gateway Routing Protocol)?
Interior Gateway Routing Protocol (IGRP) is a distance vector interior routing protocol (IGP) invented by Cisco. It is used by routers to exchange routing data within an autonomous system. IGRP is a proprietary protocol. IGRP was created in part to…
CCNP SWITCH 642-813 Guide: Configuring IP SLA
A key topic on the CCNP SWITCH exam, the Cisco IOS IP Service Level Agreement (IP SLA) feature, can be used to gather realistic information about how specific types of traffic are being handled end-to-end across a network. In this…
How to Use Cisco IP SLA to Manipulate Route Forwarding Decisions?
Cisco’s IP SLAs are one of the most versatile tools we have as network engineers. You can monitor various things from TCP connection times to device availability via ICMP ping. (See here for a more exhaustive list.) With endless possibilities comes great fun!…
Video to Show Private VLANs & Configure PVLANs on A Cisco Switch
In this video (from YouTube), Keith Barker will explain the concept of private VLANs and then demonstrates how to configure them on a Cisco switch. This video show is very useful to help you prepare your Cisco Certification and ameliorate…
Cisco CCNP: How to Configure IP Source Guard?
IP Source Guard is a per-interface traffic filter that permits IP traffic only when the IP address and MAC address of each packet matches one of two sources of IP and MAC address bindings: •Entries in the Dynamic Host Configuration…
How to Configure DHCP Snooping?
DHCP snooping is a security feature intended to prevent rogue DHCP server from sending malicious DHCP replies. When DHCP snooping is enabled, the switch intercept all the DHCP requests, and discards DHCP replies coming from “untrusted” ports. The offending switch…
How to Troubleshoot OSPF?
OSPF is one of our more complicated routing protocols, and it can be pretty intimidating, especially at first. But once you have mastered how to configure this Link State Protocol, the first thing you realize is that it is built…
CCNP TSHOOT: Cisco Troubleshooting Techniques & Procedures
Troubleshooting techniques are vital to understand to obtain the Cisco certified Network Professional (CCNP) and other higher level certifications. Sean Wilkins, an accomplished networking consultant for SR-W Consulting, wrote an article of Cisco Troubleshooting Techniques & Procedures. So you can…
What You Should Know about Configuring a Cisco IOS Switch?
Most network switches used by small businesses and home offices typically require no configuration — they’re “plug and play.” However, it’s important to remember that plug and play doesn’t always work. In addition, these switches certainly don’t offer any troubleshooting, logging, security,…
