Cisco Certification – Page 4 – Router Switch Blog

How to Fix OSPF Split Area with GRE Tunnel?

Posted on November 30, 2012 by RouterSwitch Tech | 0 Comments

‘How to Fix OSPF Split Area with GRE Tunnel?’ Well, here we will share a document of Fixing OSPF Split Area with GRE Tunnel from Cisco Support Community, which tell us the details and steps to configure OSPF, GRE Tunnel…

Tips & Examples: Configuring a GRE Tunnel

Posted on November 29, 2012 by RouterSwitch Tech | 0 Comments

Tunneling provides a mechanism to transport packets of one protocol within another protocol. The protocol that is carried is called as the passenger protocol, and the protocol that is used for carrying the passenger protocol is called as the transport…

How to Configure Spanning Tree Protocol (STP) on Catalyst Switches?

Posted on November 29, 2012 by RouterSwitch Tech | 0 Comments

Spanning Tree Protocol (STP) is a Layer 2 protocol that runs on bridges and switches. The specification for STP is IEEE 802.1D. The main purpose of STP is to ensure that you do not create loops when you have redundant…

OSPF Areas Types, OSPF Router Types & OSPF Route Types

Posted on November 27, 2012 by RouterSwitch Tech | 0 Comments

OSPF is a link state routing protocol that updates the routing table only when network changes occur, rather than at a predefined interval. OSPF supports variable length subnet masks (VLSM) and route summarization. Watch the video to learn OSPF: OSPF routers and…

How the Root Bridge and Ports are Chosen?

Posted on November 16, 2012 by RouterSwitch Tech | 0 Comments

The Root Bridge In STP configured switched LAN or broadcast domain, a switch is designated as the root bridge. The root bridge serves as an administrative point for all spanning-tree calculations to determine which redundant links to block. An election…

Root Port Selection on a Switch

Posted on November 16, 2012 by RouterSwitch Tech | 0 Comments

Best Paths to the Root Bridge After the root bridge has been designated for the spanning tree process, the next process is to determine the best paths to the root bridge from all destinations in the network. The best path…

VLAN Switch Port Modes

Posted on November 14, 2012 by RouterSwitch Tech | 0 Comments

When you configure a VLAN, you must assign it a number ID, and you can optionally give it a name. The purpose of VLAN implementations is to associate ports with particular VLANs. You configure the port to forward a frame…

Types of VLANs

Posted on November 14, 2012 by RouterSwitch Tech | 0 Comments

“Hello, i am getting difficulty in the types of VLAN?? Please explain the following: How many types of VLAN are existing? Explain each type? Types of traffic VLAN can carry?” There are different types of VLANs. The type of network traffic…

Five Things You Should Know About DHCP Snooping

Posted on November 6, 2012 by RouterSwitch Tech | 0 Comments

DHCP snooping allows the switch to monitor and control DHCP messages received from untrusted devices connected to the switch. When DHCP snooping is enabled, the system builds and maintains a database of valid IP-address/MAC-address (IP-MAC) bindings called the DHCP snooping…

Cisco VTP Version 3, Is VTP Making a Comeback?

Posted on October 31, 2012 by RouterSwitch Tech | 0 Comments

What is VTPv3? VTP version 3 is the third version of the VLAN trunk protocol and enhances its initial functions well beyond the handling of VLAN matters. There is a document at Cisco.com about VTPv3. Let’s dig into that. Features The…

How to Configure OSPF on Cisco Routers?

Posted on October 17, 2012 by RouterSwitch Tech | 0 Comments

OSPF (Open Shortest Path First) is a routing protocol developed by Internet Engineering Task Force (IETF). OSPF is standards-based which means it is available on routers by Cisco as well as other vendors, making it a vendor-neutral routing protocol. This…

How to Set Up IPSec Direct Encapsulation on Cisco Devices?

Posted on October 10, 2012 by RouterSwitch Tech | 0 Comments

With the importance of internet security being at the forefront of everyone’s mind these days, importance of keeping data safe while in transit is vital. There are of course a number of different technologies that are available to keep data…

Understanding Cisco IOS Static Multicast Routes

Posted on September 25, 2012 by RouterSwitch Tech | 0 Comments

In this short article we’ll take a look at Cisco IOS static multicast routes (mroutes) and the way they are used for RPF information selection. Multicast routing using PIM is not based on propagation of any type of multicast routes…

How to Configure GRE over an IPSec Tunnel on Routers?

Posted on September 24, 2012 by RouterSwitch Tech | 0 Comments

To configure Generic Routing Encapsulation (GRE) over an IPSec tunnel between two routers, you can refer to these steps as follows: 1. Create a tunnel interface (the IP address of tunnel interface on both routers must be in the same…

Cisco Guide: Migration of Cisco PIX 500 Series to Cisco ASA 5500 Series

Posted on September 18, 2012 by RouterSwitch Tech | 0 Comments

The Cisco ASA 5500 Series Adaptive Security Appliances deliver a powerful combination of multiple market-proven technologies in a single platform, making it operationally and economically feasible for organizations to deploy comprehensive security services to more locations. Migrate your Cisco PIX…

Cisco CCNP: How to Configure IP Source Guard?

Posted on September 10, 2012 by RouterSwitch Tech | 0 Comments

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 in a Cisco Catalyst Switch?

Posted on August 31, 2012 by RouterSwitch Tech | 0 Comments

Here we go, with the configuration of DHCP snooping on a Cisco Switch. This feature protects the network by allowing the Cisco Switches to accept DHCP response message only from the authorized servers connected to the trusted interfaces in a…

How to Configure DHCP Snooping?

Posted on August 28, 2012 by RouterSwitch Tech | 0 Comments

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…

Cisco ASA 8.4 vs. Typical NAT/PAT Configuration

Posted on August 25, 2012 by RouterSwitch Tech | 0 Comments

In computer networking, network address translation (NAT) is the process of modifying IP address information in IP packet headers while in transit across a traffic routing device. Here we will focus on NAT and PAT, as well as the related…

How to Configure Cisco Routers as Frame Relay Switch (FRS)?

Posted on August 21, 2012 by RouterSwitch Tech | 0 Comments

Students and People who are preparing for the CCNA Exam often need to have a frame relay switch in their lab to practice for the Frame-Relay. How to configure Frame-Relay Switching on a Cisco Router? The following details and steps with…

VLAN Trunking Protocol (VTP) & VTP Modes

Posted on August 17, 2012 by RouterSwitch Tech | 0 Comments

What is a VLAN Trunking Protocol (VTP)? “VTP allows a network manager to configure a switch so that it will propagate VLAN configurations to other switches in the network” VLAN Trunking Protocol (VTP) is a Cisco proprietary Layer 2 messaging…

Configure Private VLANs on Cisco 3560 Switches

Posted on August 16, 2012 by RouterSwitch Tech | 0 Comments

The private-VLAN feature addresses two problems that service providers face when using VLANs: 1. Scalability: The switch supports up to 1005 active VLANs. If a service provider assigns one VLAN per customer, this limits the numbers of customers that the…