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 command do you need to issue on an interface if you require HSRP group numbers from 256 - 4069 and timers will millisecond values?

Answer 6

R1(config-if)# standby version 2

Question 7

What does the preempt command do in HSRP?

Answer 7

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

Question 8

What command is used to enable HSRP authentication?

Answer 8

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

Examples:
R1(config-if)# standby 99 authentication My_Pa$$w0Rd
R1(config-if)# standby 99 authentication md5 key-chain NAME
R1(config-if)# standby 99 authentication key-string My_Pa$$w0Rd

Question 9

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

Answer 9

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 10

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

Answer 10

• Active
• Standby
• Speaker

Question 11

What is the command to verify HSRP?

Answer 11

show standby

Question 12

What are the commands to enable basic VRRP?

Answer 12

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

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

Question 13

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

Answer 13

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

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

Question 14

In VRRP what is different about preemption compared to HSPR?

Answer 14

Preemption is enabled by default.

Question 15

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

Answer 15

• Master
• Backup

Question 16

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

Answer 16

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

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

Question 17

What is the command to enable VRRPv3?

Answer 17

R1(config)# fhrp version vrrp v3

Question 18

Why would you want to enable VRRPv3 on a device?

Answer 18

To support IPv6 addresses

Question 19

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

Answer 19

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 20

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

Answer 20

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

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

Question 21

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

Answer 21

AVG - Active Virtual gateway
AVF - Active Virtual Forwarder

Question 22

In GLBP, what is the command for basic configuration?

Answer 22

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

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

Question 23

In GLBP, what is the command to enable preemption?

Answer 23

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

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

Question 24

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

Answer 24

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

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

Question 25

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

Answer 25

• Hello 3
• Hold 10

Question 26

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

Answer 26

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