Computer Network Tutorial

Introduction of Computer Network Types of Computer Network Network Topology Computer Networking Architecture Transmission Modes (Data Flow) Basic Networking Devices Integrate Services Digital Network (ISDN)

Model

OSI Model TCP/IP Model

Physical Layer

Digital Transmission Analog Transmission Transmission Media Switching

Data Link Layer

Error detection and Error correction Data Link Control Multiple Access Aloha

Network Layer

Network Layer - Logical Address Address Mapping Unicast Routing Protocol

Transport Layer

Process to Process Delivery User Datagram Protocol Transmission Control Protocol Stream Control Transmission Protocol Session Layer and Presentation Layer

Application Layer

Domain Name System Application Protocol E-mail Cryptography

Misc

Classes of Routing Protocols Classification of Routing Algorithms Controlled Access Protocols in Computer Networks Differences between IPv4 and IPv6 Fixed and Flooding Routing Algorithms Advantages and Disadvantages of Fibre Optics Cable APIPA Difference between Active and Passive FTP Fiber Optics and its Types Method of Joining and Fusion of Fiber Optic Cable Define Framing in Computer Network Disadvantages of Computer Network Mesh Topology Diagram in Computer Network Ring Topology in Computer Network Star Topology in Computer Networks 4G Mobile Communication Technology Advantages and Disadvantages of LAN Advantages and Disadvantages of MAN Advantages and Disadvantages of WAN Application Layer in OSI Model Cyclic Redundancy Check Example Data link layer in OSI model Difference between Transport and Network Layer Hamming Code Example Network Layer in OSI Model Session Layer in OSI Model Transport Layer in OSI Model Two Port Network in Computer Networks Uses of Computer Networks What is Computer Network What is Framing in a Computer Network Advantages and Disadvantages of Bus Topology Difference between Star Topology and Bus Topology Subnetting in Computer Network Subnetting Questions and Answers What is Bus Topology What is Network Topology and Types in Computer Networks Access Control in Networking Basic Characteristics of Computer Network Benefits of SOCKS5 Proxy in Computer Networks Computer Network viva Questions Difference between BOOTP and RARP Difference Between Network Topologies and Network Protocols Difference between NFC and RFID Difference Between Point-to-Point Link and star Topology Network Differences Between MSS and MTU Differences Between Trunk Port and Access Port Different Modes of Communication in Computer Networks MIME Protocol in Computer Networks Modes of Communication in Computer Networks Network Attack in Computer Network Port Address in Networking Simplest Protocol in Computer Network Sliding Window Protocol in Computer Network Stop And Wait Protocol in Computer Networks TCP 3-Way Handshake Process in Computer Networks What is a Proxy Server What is APPN What is ICMP Protocol What is Point-to-Point Protocol What is Port Address in Networking What is the HDLC Protocol What is VRRP Protocol Difference Between Analog and Digital Signals Difference Between Hub and Repeater Difference between Repeater and Switch Difference Between Transparent Bridge and Source Routing Bridge Source Routing Bridge in Computer Networks Transparent Bridge in Computer Networks Transport Protocol in Computer Networks Types of CSMA in Computer Networks What is Wired and Wireless Networking Network Security in Computer Network Disadvantages of Extranet Difference Between TELNET and FTP Define Protocol in Computer Networks Guided Transmission Media in Computer Network What is a Gateway in a Computer Network IGMP in Computer Networks LAN Protocols in Computer Networks MAN Meaning in Computer Modulation Techniques in Computer Networks Switching in DCN TCP/IP Applications What is IGMP? What is Modem in Networking What is Non-Persistent CSMA Difference between Cell Splitting and Cell Sectoring Forouzen Computer Network Open Loop and Closed Loop Congestion Control Types of Cluster Computing WAP-Wireless Access Point What are the elements of the Transport Protocol Difference between Gateway and Switch Flow Control in Data Link Layer Body Area Network Flooding in Computer Network Token Ring in Computer Networks VoIP in Computer Networks What is Infrared Transmission Congestion Control Techniques Forward Error Correction (FEC) Switching Techniques What is Telnet in Computer Network What are the Types of IPv4 Addresses IEEE 802.6 (DQDB) IEEE 802.15.4 Technology What is HDLC (High-level Data Link Control)? What is SMS Hubbing in Telecom? Circuit Switching in Computer Networks Communication Satellites in Computer Networks Features of HTTP Protocol IMAP4 (Internet Message Access Protocol) Internet Services How to Set up a Wireless Router Internetwork Routing in Computer Networks Distributed Computing System Features of GSM The 802.11 MAC Sublayer Protocol What is IEEE 802.3? What are Hubs and Switches in Computer Networks? What is Modem in a Computer Network? What is multicasting in Computer Networks? GSM -The Mobile Station What is Network Server? Slotted Aloha in Computer Network What is Ethernet in Computer Networks What is Arpanet?

What is VRRP Protocol?

This article will help you in providing a basic understanding of VRRP in the computer network.

Virtual Router Redundancy Protocol (VRRP) is a network protocol that allows multiple routers to work together as a virtual router, providing redundancy for the default gateway IP address on a LAN (Local Area Network). VRRP provides a way for network administrators to improve network reliability by creating a highly available default gateway that is virtually represented by a single IP address.

In a network without VRRP, there is only one router acting as the default gateway, which means that if that router fails, the entire network loses its connection to the outside world. With VRRP, multiple routers can act as the default gateway, and if one router fails, another router automatically takes over the job of forwarding packets, ensuring that network connectivity is maintained.

What is VRRP Protocol

VRRP works by creating a virtual router that is represented by a virtual IP address. This virtual router is shared among multiple physical routers, which participate in the VRRP group.

The VRRP group elects one router as the master, who is in charge for forwarding packets which are to be submitted to the virtual IP address. Other routers in the group act as backups, monitoring the master router's availability and taking over if it fails. All packets transmitted to the virtual IP address are forwarded by one of the backup routers if the master router fails. This happens if the backup router is chosen to replace the master router.

According to a priority system, the router with the highest priority is chosen to serve as the master router. Administrators can adjust the priority of each router in the group to control which router becomes the master.

VRRP is widely used in enterprise networks to provide redundancy for critical network resources, such as servers and gateways.

Important Aspects in VRRP

Here are some important terms used in VRRP:

  1. Virtual Router: The virtual router is a logical entity that is represented by a virtual IP address. Many physical routers in the VRRP group share the virtual router. One of the routers in the group is designated as the master in order to forward packets sent to the virtual IP address.
  2. Master Router: The master router is the router in the VRRP group that is responsible for forwarding packets sent to the virtual IP address. The router with the highest priority wins the election to become the master router, which is based on a priority system.
  3. Backup Router: The backup routers in the VRRP group are responsible for monitoring the master router and taking over its role if it fails. The backup routers continuously communicate with the master router to determine whether it is still functioning properly.
  4. Priority: The priority is the value assigned to each router in the VRRP group that determines which router becomes the master if the current master fails. Administrators can change the priority of each router to determine which router becomes the master by selecting the router with the highest priority.
  5. Advertisement Interval: The advertisement interval is the time interval between VRRP packets sent by the routers in the VRRP group. The advertisement interval is used to determine the availability of the master router.
  6. Preemption: Preemption refers to a router's capacity to replace a router with a lower priority as the master router, even if the lower priority router is operating normally.
  7. Hello Message: The hello message is a message sent by the routers in the VRRP group to announce their presence and to determine the availability of the other routers in the group. The hello message is used to elect the master router.
  8. Dead Interval: The dead interval is the time interval after which a router is considered to have failed if it does not send VRRP packets. The backup router with the greatest priority takes over as the master router in the event that the primary router fails.

Steps to configure VRRP

Here are the basic steps to configure VRRP:

  1. Enable VRRP on the interfaces of each router in the VRRP group by entering the "vrrp" command in the interface configuration mode.
  2. In the interface configuration mode, issue the command "vrrp [group number] ip [virtual IP address]" to give the VRRP group a virtual IP address..
  3. Set the priority for each router in the VRRP group by entering the "vrrp [group number] priority [priority]" command in the interface configuration mode. The router with the top priority will take over as the master router.
  4. Set the advertisement interval for the VRRP group by entering the "vrrp [group number] timers advertise [advertisement interval]" command in the global configuration mode.
  5. Configure preemption for the VRRP group by entering the "vrrp [group number] preempt" command in the interface configuration mode. This allows a higher-priority router to take over the role of the master router if necessary.
  6. Verify the VRRP configuration by entering the "show vrrp [group number]" command in the privileged EXEC mode. This will show the VRRP group's status and configuration.

This is all about VRRP in computer network. Hope you understood this topic.