Hot Standby Router Protocol (HSRP)

Image.png

SOURCE:
Primary Link=R1
Secondary Link=R2
Tertiary Link=R3
If R1 link down, R2 become Active link.
If R2 and R3 link down, R1 become Active link
If R1 link up again, it become Active link
HSRP are traffics toward the router, while PBR are traffics leaving router

HSRP is Cisco proprietary. If you want to combine with other brand, you must use VRRP

PC1
interface Ethernet0/0
 ip address 12.0.0.5 255.255.255.0

ip route 0.0.0.0 0.0.0.0 12.0.0.1

R1
hostname R1
key chain MYCHAIN
 key 1
  key-string c1$c0
interface Ethernet0/0
 ip address 12.0.0.2 255.255.255.0
 ip authentication mode eigrp 1 md5
 ip authentication key-chain eigrp 1 MYCHAIN
 standby version 2
 standby 1 ip 12.0.0.1
 standby 1 priority 110
 standby 1 preempt
interface Ethernet0/1
 ip address 23.0.0.2 255.255.255.0
 standby version 2
router eigrp 1
 network 12.0.0.0 0.0.0.255
 network 23.0.0.0 0.0.0.255
!or you can use this network 0.0.0.0 0.0.0.0
 redistribute static

 no auto-summary

R2
hostname R2
key chain MYCHAIN
 key 1
  key-string c1$c0
interface Ethernet0/0
 ip address 12.0.0.3 255.255.255.0
 ip authentication mode eigrp 1 md5
 ip authentication key-chain eigrp 1 MYCHAIN
 standby version 2
 standby 1 ip 12.0.0.1
 standby 1 priority 120
 standby 1 preempt
interface Ethernet0/1
 ip address 23.0.0.3 255.255.255.0
 standby version 2
router eigrp 1
 network 12.0.0.0 0.0.0.255
 network 23.0.0.0 0.0.0.255
!or you can use this network 0.0.0.0 0.0.0.0

 no auto-summary

R3
key chain MYCHAIN
 key 1
  key-string c1$c0
interface Ethernet0/0
 ip address 12.0.0.4 255.255.255.0
 ip authentication mode eigrp 1 md5
 ip authentication key-chain eigrp 1 MYCHAIN
 standby version 2
 standby 1 ip 12.0.0.1
 standby 1 priority 130
 standby 1 preempt
interface Ethernet0/1
 ip address 23.0.0.4 255.255.255.0
 standby version 2
router eigrp 1
 network 12.0.0.0 0.0.0.255
 network 23.0.0.0 0.0.0.255
!or you can use this network 0.0.0.0 0.0.0.0

 no auto-summary

SVR1
interface Ethernet0/1
 ip address 23.0.0.5 255.255.255.0
ip route 12.0.0.0 255.255.255.0 23.0.0.2
ip route 12.0.0.0 255.255.255.0 23.0.0.3
ip route 12.0.0.0 255.255.255.0 23.0.0.4

 

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