- Hot Standby Routing Protocol
- Virtual Router Redundancy Protocol
- Gateway Load Balancing Protocol
- Configuration Example: HSRP
- Configuration Example: GLBP
Configuration Example: HSRP
Figure 5-1 shows the network topology for the configuration that follows, which shows how to configure HSRP using the commands covered in this chapter. Note that only the commands specific to HSRP are shown in this example.
Figure 5-1 Network Topology for HSRP Configuration Example
Router 1
Router> enable |
Moves to privileged mode |
Router# configure terminal |
Moves to global configuration mode |
Router(config)# hostname R1 |
Sets router name to R1 |
R1(config)# interface fastethernet 0/0 |
Moves to interface config mode |
R1(config-if)# ip address 172.16.16.5 255.255.255.0 |
Assigns IP address and netmask |
R1(config-if)# standby 1 ip 172.16.16.254 |
Activates HSRP group 1 on the interface and creates a virtual IP address of 172.16.6.254 |
R1(config-if)# standby 1 priority 105 |
Assigns a priority value of 105 to standby group 1 |
R1(config-if)# standby 1 preempt |
This router will preempt, or take control of, the active router if the local priority is higher than the active router |
R1(config-if)# standby 1 track serial 0/0 |
HSRP will track the availability of interface serial 0/0. If serial 0/0 goes down, the router priority will be decremented by the default 10. |
R1(config-if)# no shutdown |
Enables the interface |
R1(config-if)# interface serial 0/0 |
Moves to interface config mode |
R1(config-if)# ip address 198.133.219.1 255.255.255.252 |
Assigns IP address and netmask |
R1(config-if)# no shutdown |
Enables the interface |
R1(config-if)# exit |
Returns to global config mode |
R1(config)# exit |
Returns to privileged mode |
R1# copy running-config startup-config |
Saves the configuration to NVRAM |
Router 2
Router> enable |
Moves to privileged mode |
Router# configure terminal |
Moves to global config mode |
Router(config)# hostname R2 |
Sets router name to R2 |
R2(config)# interface fastethernet 0/0 |
Moves to interface config mode |
R2(config-if)# ip address 172.16.16.6 255.255.255.0 |
Assigns IP address and netmask |
R2(config-if)# standby 1 ip 171.16.16.254 |
Activates HSRP group 1 on the interface and creates a virtual IP address of 172.16.6.254 |
R2(config-if)# standby 1 priority 100 |
Assigns a priority value of 100 to standby group 1 |
R2(config-if)# standby 1 preempt |
This router will preempt, or take control of, the active router if the local priority is higher than the active router |
R2(config-if)# standby 1 track serial 0/1 |
HSRP will track the availability of interface serial 0/1. If S0/1 goes down, the router priority will be decremented by the default 10. |
R2(config-if)# no shutdown |
Enables the interface |
R2(config-if)# interface serial 0/1 |
Moves to interface config mode |
R2(config-if)# ip address 198.133.219.5 255.255.255.252 |
Assigns IP address and netmask |
R2(config-if)# no shutdown |
Enables the interface |
R2(config-if)# exit |
Returns to global config mode |
R2(config)# exit |
Returns to privileged mode |
R2# copy running-config startup-config |
Saves the configuration to NVRAM |