Vrrp (License Required) - TP-Link JetStream T2700G-28TQ User Manual

Configure Switch C

Step Operation
1 Create routing
interfaces and
their IP
addresses
2 Create OSPF
process
3 Create networks
in the area
Configure Switch D

Step Operation
1 Create routing
interfaces and
their IP
addresses
2 Create OSPF
process
3 Create networks
in the area

10.10 VRRP (License Required)

VRRP (Virtual Router Redundancy Protocol) is a fault-tolerant protocol. Generally, all hosts in a
LAN (Local Area Network) would set a default route. Packets which are sent by the host and
whose destination address does not belong to the local network segment will be sent to the
gateway via the default route. Therefore, communication between the host and external network
can be established. Once the gateway fails, all hosts of this network segment whose default next
hop is the gateway will stop communicating with external network.
VRRP is developed to solve the problem mentioned above and designed for LAN with multicast or
broadcast function, such as Ethernet. Virtual router acts as a backup group which consists of one
master router and several backup routers.
The virtual router (also a backup group) has its own IP address. This IP address can be the same
as the interface address of any router in the backup group. In this case, the virtual router is also
called IP address owner. All physical routers in the backup group have their own IP addresses.
Hosts in LAN only recognize the IP address of the virtual router, but not that of the master router or
backup routers. The IP address of the virtual router is assigned as the default gateway for the
participating routers. Hosts in LAN communicate with external network via the virtual router. Once
the master router in backup group fails, another router will be selected to replace it from the
backup group through election protocol and thus provides routing service for hosts. Therefore,
communication between hosts and external network can be established without interruption.
Advantages of VRRP

VRRP owns the following advantages:
1. Simplified network management. In LAN with multicast or broadcast function, such as
Ethernet, even though a device fails, with the help of VRRP, highly-reliable default link can
Description
Required. On page Routing→Interface→Interface Config, create
routed port 1/0/1 with the IP 1.20.2.1/24 and routed port 1/0/2 with the
IP 1.20.1.2/24.
Required. On page Routing→OSPF→Process, Create OPSF process
1 and configure the Router ID as 3.3.3.3.
Required. On page Routing→OSPF→Network, configure network
1.20.0.0/16 in area 1.
Description
Required. On page Routing→Interface→Interface Config, create
routed port 1/0/1 with the IP 1.30.2.1/24 and routed port 1/0/2 with the
IP 1.30.1.2/24.
Required. On page Routing→OSPF→Process, Create OPSF process
2 and configure the Router ID as 4.4.4.4.
Required. On page Routing→OSPF→Network, configure network
1.30.0.0/16 in area 2.
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