What does VRRP do? Let s keep it simple

Virtual Router Redundancy Protocol: VRRP for short

VRRP principle: The responsibility of a virtual router is dynamically distributed to one of the VRRP routers on the LAN. The VRRP router that controls the IP address of the virtual router is called the master router, and it is responsible for packets.

to these virtual IP addresses.

Once the primary router is unavailable, this selection process provides a dynamic failover mechanism, which allows for the virtual router's.

The IP address can be used as the default first-hop router for the end host.

All hosts in a LAN have default routes set when the destination address sent by the host in the network is not in the CIDR block.

, the packets are sent to the external router through the default route, enabling communication between the host and the external network.

The VRRP works as follows:

VRRP uses an election mechanism to determine the status of the router (master or backup). A group of routers running VRRP form a virtual router, one of which is in the master state and the others are in the backup state.

vrrp configuration command:

Switch S1:

s1]vlan 10

s1]int g0/0/3

s1-gigabitethernet0/0/3]port link-type acc

s1-gigabitethernet0/0/3]port default vlan 10

s1-gigabitethernet0/0/3]q

s1-port-group-1]group-member g0/0/1 g0/0/2

s1-port-group-1]port link-type access

s1-gigabitethernet0/0/1]port link-type access

s1-gigabitethernet0/0/2]port link-type access

s1-port-group-1]port default vlan 10

s1-gigabitethernet0/0/1]port default vlan 10

s1-gigabitethernet0/0/2]port default vlan 10

s1-port-group-1]

Configure router r1:

r1-gigabitethernet0 0 0]ip add 24 vlan10 real gateway.

r1-gigabitethernet0 0 0]vrrp vrid 1 virtual-ip as the primary gateway for vlan 10;

r1-gigabitethernet0/0/0]vrrp vrid 1 priority 200

dis vrrp brief：

Configure router r2:

r2]int g0/0/0

r2-gigabitethernet0 0 0]ip add 24 vlan10 real gateway.

r2-gigabitethernet0 0 0]vrrp vrid 1 virtual-ip as backup gateway for vlan 10;

r2-gigabitethernet0/0/0]vrrp vrid 1 priority 100

vrrp, Chinese name virtual router redundancy protocol.

When the destination address sent by the host in the network is not in the CIDR block, packets will be sent to the external router through the default route, so that the host can communicate with the external network. If VRRP is set for the router, the virtual router will enable the backup router to communicate with the entire network.

Virtual Router Redundancy Protocol: VRRP for short

90 Explain the configuration of firewall VRRP, link aggregation, MSTP, and NAT in detail.

VRRP is defined as:

The virtual routing redundancy protocol uses several routing devices to form a virtual routing device, and uses a certain mechanism to ensure that when the host's next-hop router fails, the service is switched to the backup router in time, so as to ensure the continuity and reliability of the service.

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