Refer to the exhibit. An engineer configures a new HSRP group. While reviewing the HSRP status, the engineer sees the logging message generated on R2. What is the cause of the message?
A.
The HSRP configuration has caused a routing loop
B.
The same virtual IP address has been configured for two HSRP groups
C.
A PC is on the network using the IP address 10.10.1.1
D.
The HSRP configuration has caused a spanning-tree loop
Actually no, there will be problems. You can't have active duplicate IPs associated with different MACs on a subnet. The reason HSRP works is because only one host (router) in an HSRP group is active with the VIP/MAC.
But with two independent groups, both are speaking and in this case, with conflicting IPs
The sourced Mac address is an HSRP mac: 0000.0c07.acxx (xx is the HSRP group number in hexadecimal format).
Both HSRP groups (groups 50 & 28) use the same virtual IP address which is causing the issue.
look at the MAC address of the LOG Message: "%IP-4-DUPADDR: Duplicate address 10.10.1.1 on FastEthernet1/0, sourced by 0000.0c07.ac28" ... The MAC Address is a Virtual HSRP MAC Address!!!
I've tested again and cought this bug, the same error actually nyway you can chache MAC manually, by default yes, it belongs to HSRP process, the difference only in the groups 10 vs 11;
*Jan 10 10:11:31.992: %IP-4-DUPADDR: Duplicate address 10.99.0.254 on Ethernet0/1.10, sourced by 0000.0c07.ac0a
cisco_R5#
cisco_R5#s runn int ethernet 0/1.10
Building configuration...
Current configuration : 119 bytes
!
interface Ethernet0/1.10
encapsulation dot1Q 10
ip address 10.99.0.5 255.255.255.0
standby 11 ip 10.99.0.254 <<<<<<<<<<<<<<
end
cisco_R5#
far end:
*Jan 10 10:11:01.888: %IP-4-DUPADDR: Duplicate address 10.99.0.254 on Ethernet0/1.10, sourced by 0000.0c07.ac0b
cisco_R2(config-subif)#
cisco_R2(config-subif)#do s runn int ethernet 0/1.10
Building configuration...
Current configuration : 119 bytes
!
interface Ethernet0/1.10
encapsulation dot1Q 10
ip address 10.99.0.2 255.255.255.0
standby 10 ip 10.99.0.254 <<<<<<<<<<<<<<<<<<<<<<<
end
cisco_R2(config-subif)#
*Jan 10 10:11:31.993: %IP-4-DUPADDR: Duplicate address 10.99.0.254 on Ethernet0/1.10, sourced by 0000.0c07.ac0b
cisco_R2(config-subif)#
fix:
cisco_R2(config-subif)#int ethernet 0/1.10
cisco_R2(config-subif)#no standby 10 <<<<<<<<<<<<<<<<<<<
*Jan 10 10:16:33.457: %HSRP-5-STATECHANGE: Ethernet0/1.10 Grp 10 state Active -> Disabled
cisco_R2(config-subif)# standby 11 ip 10.99.0.254 <<<<<<<<<<<<<<<<<<<
cisco_R2(config-subif)#
*Jan 10 10:17:03.504: %HSRP-5-STATECHANGE: Ethernet0/1.10 Grp 11 state Speak -> Standby
cisco_R2(config-subif)#do s standby br
P indicates configured to preempt.
|
Interface Grp Pri P State Active Standby Virtual IP
Et0/0.10 200 100 Active local unknown 192.168.255.254
Et0/1.10 11 100 Standby 10.99.0.5 local 10.99.0.254 <<<<<<<<<<<<<<<
cisco_R2(config-subif)#
cisco_R2(config-subif)#do s runn int ethernet 0/1.10
!
interface Ethernet0/1.10
encapsulation dot1Q 10
ip address 10.99.0.2 255.255.255.0
standby 11 ip 10.99.0.254
end
cisco_R3(config-subif)#
*Dec 22 20:44:43.970: %IP-4-DUPADDR: Duplicate address 10.111.12.6 on Ethernet0/0.70, sourced by aabb.cc00.5000
cisco_R3(config-subif)#do show runn int Ethernet0/0.70
Building configuration...
Current configuration : 123 bytes
!
interface Ethernet0/0.70
encapsulation dot1Q 70
ip address 10.111.12.1 255.255.255.248
standby 11 ip 10.111.12.6
end
cisco_R3(config-subif)#
*Dec 22 20:45:13.974: %IP-4-DUPADDR: Duplicate address 10.111.12.6 on Ethernet0/0.70, sourced by aabb.cc00.5000
cisco_R3(config-subif)#
you are wrong... look at the MAC address of the LOG Message: "%IP-4-DUPADDR: Duplicate address 10.10.1.1 on FastEthernet1/0, sourced by 0000.0c07.ac28" ... The MAC Address is a Virtual HSRP MAC Address!!!
far-end:
cisco_R5(config-subif)#do s runn interface ethernet 0/0.70
Building configuration...
Current configuration : 96 bytes
!
interface Ethernet0/0.70
encapsulation dot1Q 70
ip address 10.111.12.6 255.255.255.248
end
cisco_R5(config-subif)#
upvoted 1 times
...
...
This section is not available anymore. Please use the main Exam Page.350-401 Exam Questions
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
civan
Highly Voted 2 years, 4 months agolandgar
Highly Voted 2 years, 3 months agodanman32
1 year, 9 months agoAbdullahMohammad251
Most Recent 8 months, 1 week ago[Removed]
11 months, 2 weeks agoRose66
2 years, 3 months agonushadu
2 years, 3 months agonushadu
2 years, 3 months agonushadu
2 years, 3 months agonushadu
2 years, 4 months agoRose66
2 years, 3 months agonushadu
2 years, 4 months ago