So many misleading comments. Current status of track object is "Up" as displayed under "show standby". o, current priority is 90. If fa0/0 goes down, track object changes to "Down", and so priority decrements by 10 (to 80).
Timers are default.
Tricky question.
E: is 100% correct
A: should also be correct, the main reason for using FHRP is when the active device doesn't respond anymore, then the backup one will become active and when Hold time expires that means that the active device is not responding anymore.
B: should also be correct unless if I understand it wrong and the "UP" statement means that the track will be triggered when the int goes from down to up. which in real life I don't think this makes any sense. why do you want to track a down interface only to decrement the priority of a standby device?!
in conclusion I think A b and E are correct, which is normal with Cisco exams
A. wrong! because the statement is incomplete, for being correct it should say: "R2 -Fa1/0- becomes the active router..."
C. wrong! because we can see from the output that the link has already came back up but R2 Fa1/0 remains as Standby (because of the preemption disabled)
D. wrong! the statement can not be confirmed because there are other possibilities for the descripted scenario e.g. "the router with IP 10.10.1.3 is active because R2 Fa1/0 went down and recover back up but the preemption is not enabled" (this is the most likely reason why router 10.10.1.3 is active despite that it has a lower priority than R2 Fa1/0)
B & E are correct! and they get explained themself...
A: Incorrect, we don't know if there are more routers on the HSRP group, the preemption being disabled also reasures me that R2 will not become active router, just another router will come up as active.
B: Correct, the command "track interface FastEthernet0/0 state Up decrement 10" will be checking if the state is Up, when it goes down, the action occurs.
E: Correct, nothing to add xD.
If the hold time expires and R2 has the highest priority, then it might as well become the active router. Preemption has nothing to do in that scenario. But I agree with you that we don't know if there are any other routers in the group
Confirmed it is B in CML
HSRP_R2(config-track)#int g0/0
HSRP_R2(config-if)#shut
*Sep 11 19:43:32.681: %RG_FAULTS-6-PRICHANGE: RG Infra RG[1] Priority update. new priority [90] old priority [100] Reason: Fault occurred on the traffic interface
*Sep 11 19:43:32.706: %TRACK-6-STATE: 1 interface Gi0/0 line-protocol Updo show standby
GigabitEthernet0/1 - Group 0
State is Standby
1 state change, last state change 00:03:53
Virtual IP address is 10.10.1.1
Active virtual MAC address is 0000.0c07.ac00
Local virtual MAC address is 0000.0c07.ac00 (v1 default)
Hello time 3 sec, hold time 10 sec
Next hello sent in 0.704 secs
Preemption disabled
Active router is 10.10.1.2, priority 85 (expires in 8.880 sec)
Standby router is local
>>>>>>>>>>>> Priority 80 (configured 90) <<<<<<<<<<<<<<<<<<<<<<<
Track object 1 state Down decrement 10
Group name is "hsrp-Gi0/1-0" (default)
It has not been mentioned that there are only two routers in the HSRP group. A group can have up to 32 routers. Maybe there is another router R3 that also has a priority of 90 but R2 was elected as primary.
Therefore BE
With HSRP it is common to track the interface connecting to an upstream device. However, HSRP is set up on the LAN interface (or vlan interface), which serves as a default gateway for the LAN. So, the different interfaces are OK.
A - Well, that's the default behaviour of HSRP- TRUE
B - When the interface is up, the SLA REDUCES the priority - WRONG
C - Preemption is disabled - WRONG
D - The priorities don't match - WRONG
E - 3 and 10 are the HSRP default timers - TRUE
Maybe Fa0/0 just went down, therefore the HSRP priority went up from 80 to 90.
B) It has not much to do with IP SLA. The track configuration under "show standby" means that the current state of the track object is "Up". If fa0/0 is shut down, then the state changes to "Down."
Something like this:
DSW2(config)#int fa0/1
DSW2(config-if)#shut
00:02:25: %LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down
00:02:25: %TRACKING-5-STATE: 1 interface Fa0/1 state Up->Down
DSW2(config-if)#do sh stand
Vlan 1 - Group 1
State is Active
2 state changes, last state change 00:2:34
Virtual IP address is 172.16.3.1
Active virtual MAC address is 0000.0c07.ac01
Local virtual MAC address is 0000.0c07.ac01(v1 default)
Hello time 3 sec, hold time 10 sec
Next hello sent in 2.102secs
Preemption enabled
Active router is local
Standby router is 172.16.3.3, priority 99 (expires in 3.555 sec)
Priority 91 (default 100)
Track interface FastEthernet0/1 state Down decrement 9
cisco_R3(config-subif)#do s runn int Ethernet0/0.60
Building configuration...
Current configuration : 180 bytes
!
interface Ethernet0/0.60
encapsulation dot1Q 60
ip address 10.111.11.1 255.255.255.0
standby 40 ip 10.111.11.254
standby 40 priority 90
standby 40 track 2 decrement 10
end
...
!
track 2 interface Loopback1 line-protocol
!
cisco_R3(config-subif)#do s stand
...
Ethernet0/0.60 - Group 40
State is Active
2 state changes, last state change 00:20:03
Virtual IP address is 10.111.11.254
Active virtual MAC address is 0000.0c07.ac28
Local virtual MAC address is 0000.0c07.ac28 (v1 default)
Hello time 3 sec, hold time 10 sec
Next hello sent in 0.896 secs
Preemption disabled
Active router is local
Standby router is unknown
Priority 90 (configured 90)
Track object 2 state Up decrement 10
Group name is "hsrp-Et0/0.60-40" (default)
cisco_R3(config-subif)#
cisco_R3(config-subif)#in loo1
cisco_R3(config-if)#shutdown
cisco_R3(config-if)#
*Dec 22 15:41:59.953: %TRACK-6-STATE: 2 interface Lo1 line-protocol Up -> Down
cisco_R3(config-if)#
*Dec 22 15:42:01.958: %LINK-5-CHANGED: Interface Loopback1, changed state to administratively down
*Dec 22 15:42:02.960: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to down
cisco_R3(config-if)#do s stand
...
Ethernet0/0.60 - Group 40
State is Active
2 state changes, last state change 00:23:15
Virtual IP address is 10.111.11.254
Active virtual MAC address is 0000.0c07.ac28
Local virtual MAC address is 0000.0c07.ac28 (v1 default)
Hello time 3 sec, hold time 10 sec
Next hello sent in 1.920 secs
Preemption disabled
Active router is local
Standby router is unknown
Priority 80 (configured 90) <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Track object 2 state Down decrement 10
Group name is "hsrp-Et0/0.60-40" (default)
cisco_R3(config-if)#
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