How-to - 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…

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…

Example Show: How to Configure a Cisco ASA 5540 for Video Conferencing for Polycom Device?

Posted on November 8, 2012 by RouterSwitch Tech | 0 Comments

Here we were asked to configure the Polycom device to have video conferencing with external world. Our Polycom device is behind a Cisco ASA 5540 firewall as shown in the below network layout. In order to permit H.323 video conferencing…

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…

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…

Cisco VSS Configuration: Cisco Catalyst 6500 Virtual Switching System

Posted on September 3, 2012 by RouterSwitch Tech | 0 Comments

A VSS is network system virtualization technology that pools multiple Cisco Catalyst 6500 Series Switches into one virtual switch, increasing operational efficiency, boosting nonstop communications, and scaling system bandwidth capacity to 1.4 Tbps. At the initial phase, a VSS will…

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…

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…

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…

How to Connect Cisco IP Phones?

Posted on August 13, 2012 by RouterSwitch Tech | 0 Comments

When you buy all Cisco IP phones, without the power adaptor, so how to work? There are 3 options for connections. 1) Buy power transformer (CP-PWR-CUBE-3) directly; suitable for few Qty, will be an economic method. 2) If you have…

Four Modes to Access and Configure a Cisco Router

Posted on August 8, 2012 by RouterSwitch Tech | 0 Comments

Cisco IOS Command Summary—Four Modes to Access and Configure a Cisco Router The four modes for accessing and configuring a Cisco router are: user EXEC mode, privileged EXEC mode, global configuration mode, interface configuration mode Each mode has a unique command set. Purpose of…

How to Configure OSPF in a Single Area?

Posted on August 2, 2012 by RouterSwitch Tech | 0 Comments

OSPF stands for Open Shortest Path First and it represents a routing protocol belonging to the group of link-state routing protocols. OSPF routing protocol is classified among the best dynamic protocols that exist in networks today. It is also considered to…