HSRP Flashcards
What does FHRP stand for?
First Hop Redundancy Protocol
What is FHRP?
A first hop redundancy protocol which is designed to protect the default gateway used on a network by allowing two or more routers to provide backup for it
What is the most popular FHRP?
HSRP (Hot Standby/Swap Router Protocol)
With HSRP, do the routers being used with the protocol have actual IP addresses on their physical links?
Yes
How are HSRP routers elected under a normal configuration?
The highest IP Address of the physical interfaces being used will be elected as Active. The lowest will be the standby.
How do both routers make sure that the other one is still up?
They send Keep Alive Hellos
How does a Standby Router become an Active Router
A keep alive hello wasn’t responded to so the Standby router will assume the role of Active
What is a virtual IP address on a HSRP router?
It is the Virtual IP Address configured on both routers to act as a default gateway that never goes down
Where does all traffic bound for the Virtual IP go?
Through the Active Router
What is a configuration for an HSRP Router?
R1(config)#int {int}
R1(config-if)#ip address {ip-address} {subnet-mask}
R1(config-if)#no shut
R1(config-if)#standby 1 ip {ip-address}
What is the default priority on routers for HSRP?
100
When a higher priority router comes back online after a failure it will transition back to Active when what is enabled?
Pre-emption
Is Pre-Emption enabled by default?
No
The lower priority router will remain the active router when the failed router comes back online when this is not enabled on the router
Pre-emption
How do you configure a priority and pre-emption on a router?
int {int}
R1(config-if)#standby 1 priority {priority}
R1(config-if)#standby 1 preempt
