FHRP (HSRP, VRRP, GLBP)

Question 1

What is the command to enable HSRP on an interface?

Answer 1

R1(config-if)# standby {group-id} ip {virtual-address}

Example:
R1(config-if)# standby 99 ip 10.1.1.3

Question 2

What is the default priority of an HSRP router and what priority is most preferred?

Answer 2

• Priority 100
• Higher is preferred

NOTE: Can be any value from 0 - 255

Question 3

What is the command to adjust the HSRP hello and hold down timers?

Answer 3

R1(config-if)# standby {group-id} timers {hello-secs} {holddown-secs}

R1(config-if)# standby 99 timers 5 15

Question 4

What are the HSRP default hello and hold down timers?

Answer 4

3 (hello) and 10 (hold down)

Question 5

What is the command to enable preemption on an HSRP interface?

Answer 5

R1(config-if)# standby {group-id} preempt

R1(config-if)# standby 99 preempt

Question 6

What does the preempt command do in HSRP?

Answer 6

It negotiates the Active router based on priority without waiting for a failover event to occur.

Question 7

What command is used to enable HSRP authentication?

Answer 7

R1(config-if)# standby {group-id} authentication {password | md5 key-chain | key-string keystring}

R1(config-if)# standby 99 authentication My_Pa$$w0Rd
R1(config-if)# standby 99 authentication
R1(config-if)# standby 99 authentication

Question 8

What are the commands to enable HSRP authentication using an MD5 key-chain

Answer 8

R1(config)# key chain HSRP_KEYCHAIN
R1(config-keychain)# key 999
R1(config-keychain-key)# key-string Pa$$W0rd
R1(config)# int gi0/0
R1(config-if)# standby 99 authentication md5 key-chain HSRP_KEYCHAIN

Question 9

In HSRP, what are the roles or states a device can be in?

Answer 9

• Active
• Standby
• Speaker

Question 10

What is the command to verify HSRP?

Answer 10

show standby

Question 11

What are the commands to enable basic VRRP?

Answer 11

R1(config-if)# vrrp {group-id} ip {virtual-address}

Example:
R1(config-if)# vrrp 99 ip 10.1.1.3

Question 12

What are the commands to adjust VRRP Priority on a Cisco router?

Answer 12

R1(config-if)# vrrp {group-id} priority {0-255}

Example:
R1(config-if)# vrrp 99 priority 150

Question 13

In VRRP what is different about preemption compared to HSPR?

Answer 13

Preemption is enabled by default.

Question 14

In VRRP what are the roles (or states) a device can be in?

Answer 14

• Master
• Backup

Question 15

In VRRP, what are the commands to adjust the timers?

Answer 15

R1(config-if)# vrrp {group-id} timers advertise {secs}

Example:
R1(config-if)# vrrp 99 timers advertise 3

Question 16

What is the command to enable VRRPv3?

Answer 16

R1(config)# fhrp version vrrp v3

Question 17

Why would you want to enable VRRPv3 on a device?

Answer 17

To support IPv6 addresses

Question 18

What are the commands to configure basic VRRPv3 on a device?
(4 commands)

Answer 18

R1(config)# fhrp version vrrp v3
R1(config)# int gi0/0
R1(config-if)# vrrp 99 address-family ipv6
R1(config-if-vrrp)# address fc00:a:b:c::1/64

Question 19

What are the commands to configure VRRP priority change with tracking?

Answer 19

R1(config-if)# vrrp {id} track {id} decrement {value}

Example:
R1(config-if)# vrrp 99 track 1 decrement 50

Question 20

In GLBP, what are the names of the device roles?

Answer 20

AVG - Active Virtual gateway
AVF - Active Virtual Forwarder

Question 21

In GLBP, what is the command for basic configuration?

Answer 21

R1(config-if)# glbp {group-id} ip {virtual-address}

Example:
R1(config-if)# glbp 99 ip 10.99.1.4

Question 22

In GLBP, what is the command to enable preemption?

Answer 22

R1(config-if)# glbp {group-id} preempt

Example:
R1(config-if)# glbp 99 preempt

Question 23

In GLBP, what is the command to adjust hello and hold timers?

Answer 23

R1(config-if)# glbp {group-id} timers {hello-secs} {hold-secs}

Example:
R1(config-if)# glbp 99 timers 2 9

Question 24

In GLBP, what are the default hello and hold timer values?

Answer 24

• Hello 3
• Hold 10

Question 25

In GLBP, what are the commands to configure weighted load-balancing?

Answer 25

R1(config-if)# glbp {group-id} load-balancing weighted
R1(config-if)# glbp {group-id} weighting {1-254}

Example:
R1(config-if)# glbp 99 load-balancing weighted
R1(config-if)# glbp 99 weighting 125