HSRP: INTERVIEW QUESTIONS


 

How many STANDBY/HSRP groups can be formed?

&

How many members can be present in a group in HSRP?

Ans.

Maximum no. of HSRP Groups = 16
Maximum no. of Layer 3 devices or members in a single HSRP group = 16
Total no. of Layer 3 devices = 16 X 16 = 256

Recommended maximum no. of Layer 3 devices, in total is not 256, it is 64.

Reference Link
Topic: HSRP Group Limitation on Catalyst 3550 FAQ

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3550-series-switches/44143-hsrp-cat3550-limit-44143.html

 

Can we have more than one Active router in a group?

What is the effect of Tracking and what is the default value of decrement in  case of failure of a single interface?

In case of single vlan in lan, HSRP provides Redundancy OR, Load sharing OR, both ?

In case of multiple vlan in lan, HSRP provides Redundancy OR, Load sharing OR, both ?

What is Gratious ARP ?

In HSRP, Is Active / Active state a problem or normal ?

Ans.

https://networkproxy.wordpress.com/2014/10/27/fb-discussions-hsrp-active-active/

 

SCENARIO

Case 1: Only one VLAN is present in LAN

Case 2: Multiple VLAN’s are present in LAN

What is the difference in both cases, in terms of L3 interface of L3 device on which HSRP configuration has to be done?

In case of Multiple VLAN’s, Redundancy and Load sharing both can be acheived using single HSRP group. Why Multiple groups are required ?

SCENARIO

HSRP is running. Only one standby group is created. Two routers R1 & R2 in the group. Preempt is enabled on both.

R1 is Active(Priority: 100), R2 is Standby(Priority: 150)

In normal scenario, R1 and R2 both are working fine

New router, R3 becomes member of the same group. R3 :Preempt enabled.R3: (Priority:200)

So, what will happen? R3 will replace R1 and becomes Active itself

This will make R1 Flap or R3 will wait till R1 goes down

 

SCENARIO

R1 is Active and R2 is standby.

If preempt is enabled on R1 only, what is the effect in case of failure?

If preempt is enabled on R2 only, what is the effect in case of failure?

 

 

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