hostname Switch1
interface Vlan10
ip address 172.16.10.32 255.255.255.0
no ip redirects
standby 1 ip 172.16.10.110
standby 1 timers msec 200 msec 700
standby 1 preempt
hostname Switch2
interface Vlan10
ip address 172.16.10.33 255.255.255.0
no ip redirects
standby 1 ip 172.16.10.110
standby 1 timers msec 200 msec 750
standby 1 priority 110
standby 1 preempt
hostname Switch3
interface Vlan10
ip address 172.16.10.34 255.255.255.0
no ip redirects
standby 1 ip 172.16.10.110
standby 1 timers msec 200 msec 750
standby 1 priority 150
standby 1 preempt
Refer to the above. Three switches are configured for HSRP.
Switch1 remains in the HSRP listen state. What is the most likely cause of this status?
A.
This is normal operation.
B.
The standby group number does not match the VLAN number.
C.
IP addressing is incorrect.
D.
Priority commands are incorrect.
E.
Standby timers are incorrect.
Explanation:
This is expected behavior. When HSRP is configured on an interface, the router progresses
through a series of states before becoming active. This forces a router to listen for others in
a group and see where it fits into the pecking order. Devices participating in HSRP must
progress their interfaces through the following state sequence:
1. Disabled
2. Init
3. Listen
4. Speak
5. Standby
6. Active
Only the standby (the one with the second-highest priority) router monitors the hello
message from the active router. By default, hellos are sent every 3 seconds. If hellos are
missed for the duration of the holdtime timer (default 10 seconds, or three times the hello
timer), the active router is presumed to be down. The standby router is then clear to assume
the active role. At that point, if other routers are sitting in the Listen state, the next-highest
priority router is allowed to become the new standby router.
Reference:
CCNP BCMSN Official Exam Certification Guide, Fourth Edition, Chapter 13: Router,
Supervisor, and Power Redundancy, p. 318