From: http://nettao.blog.51cto.com/386537/211216
I,
Vrrp
Introduction:
Virtual router redundancy protocol
Virtual
The proposed router redundancy protocol aims to improve the reliability of the router (layer-3 Ethernet switch) and the external connection by using the backup mechanism. Generally, a default route is set for all hosts in the LAN to specify the default route.
Gateway, which enables communication between the Intranet and the Internet. However, if the communication link between the router and the external network of the default gateway fails, all the communication between the gateway in this segment is interrupted.
Vrrp
The Protocol solves the above problems.
Vrrp
The Protocol consists of multiple routers in the system.
Vrrp
Group, which has a virtual default gateway address. However, at any time, only the vro that controls the vgateway address in a group is an active router (
Master
) To forward data packets. If the active router fails, it selects a redundant backup router with the highest priority (
Backup
) To replace the active router. Because the terminal in the network is configured
Vrrp
The virtual gateway address. When a fault occurs, the virtual router does not change and the host remains connected. The network will not be affected by the single point of failure. This will better solve the problem of router switching in the network. Typical application topology:
The core switch is configured
Vrrp
Protocol
II:
Vrrp
Configuration
Vrrp
Is configured for the port
,
Instead of configuring the entire machine
Configure the task sequence:
1,
Create vro
2,
Configuration
Vrrp
Virtual
IP
And Interfaces
3,
Start vro
(
The first three must be configured.
)
4,
Configuration
Vrrp
Authentication (optional)
5,
Configuration
Vrrp
Auxiliary parameters (optional)
(1)
Configuration
Vrrp
Preemption Mode
(2)
Configuration
Vrrp
Priority
(3)
Configuration
Vrrp
Timer Interval
(4)
Configuration
Vrrp
Interface monitoring
Configure the instance command:
Network Topology
Digital China Network Application Competition
-
Sample questions in the competition outline"
Assume that
C2
Configure switch (config) # router vrrp 20
Switch (config-router) # inteface VLAN 20
Switch (config-router) # virtual-IP 202.192.255.254 255.255.255.0
Switch (config-router) # priority 254
Switch (config-router) # exit
Switch (config) # router vrrp 10
Switch (config-router) # interface VLAN 10
Switch (config-router) # virtual-IP 202.192.10.253 255.255.255.0
Switch (config-router) # Priority 1
Switch (config-router) # enble
In
C1
Configure switch (config) # router vrrp 10
Switch (config-router) # inteface VLAN 10
Switch (config-router) # virtual-IP 202.192.10.254 255.255.255.0
Switch (config-router) # priority 254
Switch (config-router) # exit
Switch (config) # router vrrp 20
Switch (config-router) # interface VLAN 20
Switch (config-router) # virtual-IP 202.192.255.253 255.255.255.0
Switch (config-router) # Priority 1
Switch (config-router) # enble
