| Operation | Commands |
|---|---|
| Check HSRP | Router# show stanby brief Router# show stanby Router# show hsrp brief ← Nexus Router# show hsrp ← Nexus |
| Operation | Commands |
|---|---|
| Enable HSRP | Router(config-if )# stanby GROUP ip IPADDRESS Router(config-if )# stanby 1 ip 192.168.0.10 |
| Set the virtual MAC address | Router(config-if )# stanby GROUPNUMBER MACADDRESS Router(config-if )# stanby 1 0000.01aa.aaaa |
| Set group name | Router(config-if )# stanby GROUPNUMBER name GROUPNAME Router(config-if )# stanby 1 name TestHSRP |
| Set HSRP priority | Router(config-if )# stanby GROUPNUMBER priority PRIORITY Router(config-if )# stanby 1 priority 150 The default priority is 100. The router with the higher priority becomes active. If the priority is the same, the router with the larger IP address becomes active. |
| Configure HSRP preemption | Router(config-if )# stanby GROUPNUMBER preempt delay SECOND Router(config-if )# stanby 1 preempt delay 250 Preemption is a function to regain its role as an active router in case of recovery. By delaying the transition time to the active router by specifying the delay option, You can complete routing protocol convergence and NAT table synchronization. |
| Set the HSRP timer | Router(config-if )# stanby GROUPNUMBER timers HELLOTIME HOLDTIME Router(config-if )# stanby 1 timers 5 15 Hello time is the interval at which Hello messages are sent. (Default is 3 seconds) Hold time is the time it takes to consider a router to be down. (Default is 10 seconds) |
| Enable interface tracking | Router(config-if )# stanby GROUPNUMBER timers INTERFACE DECREASEVALUE Router(config-if )# stanby 1 timers Serial 0/0 20 The interface tracking function is to monitor (track) an interface for which an asynchronous router has not set up HSRP, and to lower its own priority to the standby router when the interface goes down. The default for decreasing values is 10. |
https://www.cisco.com/c/en/us/td/docs/ios/ipapp/command/reference/iap_s4.html#wp1140784
Router# show standby brief Interface Grp Prio P State Active addr Standby addr Group addr Et0 0 120 Init 10.0.0.1 unknown 10.0.0.12
Router# show standby
Ethernet0/1 - Group 1
State is Active
2 state changes, last state change 00:30:59
Virtual IP address is 10.1.0.20
Secondary virtual IP address 10.1.0.21
Active virtual MAC address is 0004.4d82.7981
Local virtual MAC address is 0004.4d82.7981 (bia)
Hello time 4 sec, hold time 12 sec
Next hello sent in 1.412 secs
Gratuitous ARP 14 sent, next in 7.412 secs
Preemption enabled, min delay 50 sec, sync delay 40 sec
Active router is local
Standby router is 10.1.0.6, priority 75 (expires in 9.184 sec)
Priority 95 (configured 120)
Tracking 2 objects, 0 up
Down Interface Ethernet0/2, pri 15
Down Interface Ethernet0/3
Group name is "HSRP1" (cfgd)
Follow by groups:
Et1/0.3 Grp 2 Active 10.0.0.254 0000.0c07.ac02 refresh 30 secs (next 19.666)
Et1/0.4 Grp 2 Active 10.0.0.254 0000.0c07.ac02 refresh 30 secs (next 19.491)
Group name is "HSRP1", advertisement interval is 34 sec
HSPR : 192.168.1.1 Host1 : 192.168.1.2/24 Host2 : 192.168.1.3/24
Host1 > enable Host1# configure terminal Host1(config)# interface vlan 1 Host1(config-if)# ip address 192.168.1.2 255.255.255.0 Host1(config-if)# standby 1 ip 192.168.1.1 <- VIP Host1(config-if)# standby 1 priority 105 Host1(config-if)# standby 1 preempt delay minimum 10 <- When the active side is restored Automatic trimming back in ten seconds Host1(config-if)# no shutdown Host1(config-if)# exit Host1(config)# exit Host1# copy running-config startup-config
Host2 > enable Host2# configure terminal Host2(config)# interface vlan 1 Host2(config-if)# ip address 192.168.1.3 255.255.255.0 Host2(config-if)# standby 1 ip 192.168.1.1 Host2(config-if)# standby 1 priority 103 Host2(config-if)# standby 1 preempt delay minimum 10 Host2(config-if)# no shutdown Host2(config-if)# exit Host2(config)# exit Host2# copy running-config startup-config