TP-Link T2700G-28TQ T2700G-28TQ User Guide V1 - Page 223
VRRP (License Required), Operation, Description, Routing, Interface Config, Process, Network
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Configure Switch C Step Operation Description 1 Create routing interfaces and their IP addresses 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. 2 Create OSPF process Required. On page Routing→OSPF→Process, Create OPSF process 1 and configure the Router ID as 3.3.3.3. 3 Create networks Required. On page Routing→OSPF→Network, configure network in the area 1.20.0.0/16 in area 1. Configure Switch D Step Operation Description 1 Create routing interfaces and their IP addresses 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. 2 Create OSPF process Required. On page Routing→OSPF→Process, Create OPSF process 2 and configure the Router ID as 4.4.4.4. 3 Create networks Required. On page Routing→OSPF→Network, configure network in the area 1.30.0.0/16 in area 2. 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 211