Refer to the following partial output of the debug standby command on an HSRP-enabled router rtrA:
Which of the following information CANNOT be gathered from the given partial output?
A. IP address of the virtual router
B. IP address of the current active router
C. Priority of the active router
D. The tracked interfaces
Correct Answer: D
Explanation/Reference:
Answer:
The debug standby command does not provide any information about the tracked HSRP interfaces. This command displays information regarding the changes in the state of the HSRP routers and packet transmissions between the routers.
Some of the information that you can view using the debug standby command is as follows:
IP address of the virtual router
IP address of the current active router
Priority of the active router
Hello timer values Hold time values
State of the router
Interface used to exchange HSRP packets
HSRP packets contain the IP address of the virtual router. The IP address preceded by the text ip in the debug standby output is the address of the virtual router. In this case, the packets contain 10.5.5.5 after the text ip. This implies that 10.5.5.5 is the IP address of the virtual router.
After HSRP selects the active and standby routers for a group, only the active and standby routers send HSRP packets to the virtual router. If the active router fails, the standby router becomes the active router. The text Hello in and the text
Hello out indicate the hello packets received from and sent to the given IP address. Initially the router with IP address 10.5.5.1 is the active router, as indicated by the text Active router is 10.5.5.1.
The priority of the active router is 100, which is indicated by the text pri 100. However, when a hello packet from 10.5.5.2 is received, which has a higher priority (120) than the active router, the 10.5.5.2 router automatically and instantly becomes the active router. This implies that the router with the IP address 10.5.5.2 was the standby router and the standby preempt command was executed.
Objective:
Infrastructure Services Sub-Objective:
Configure and verify first-hop redundancy protocols
References:
Cisco IOS Debug Command Reference > debug sntp adjust Through debug tag-switching xtagatm vc > debug standby
Home > Support > Technology Support > IP > IP Application Services > Configure > Configuration Examples and Technotes > Avoiding HSRP Instability in a Switching Environment with Various Router Platforms > Troubleshoot > Troubleshooting Commands > Sample Debug Output
Home > Support > Technology Support > IP > IP Application Services > Design > Design Technotes > Understanding and Troubleshooting HSRP Problems in Catalyst Switch Networks > Understand HSRP
Explanation/Reference:
Answer:
The debug standby command does not provide any information about the tracked HSRP interfaces. This command displays information regarding the changes in the state of the HSRP routers and packet transmissions between the routers.
Some of the information that you can view using the debug standby command is as follows:
IP address of the virtual router
IP address of the current active router
Priority of the active router
Hello timer values Hold time values
State of the router
Interface used to exchange HSRP packets
HSRP packets contain the IP address of the virtual router. The IP address preceded by the text ip in the debug standby output is the address of the virtual router. In this case, the packets contain 10.5.5.5 after the text ip. This implies that 10.5.5.5 is the IP address of the virtual router.
After HSRP selects the active and standby routers for a group, only the active and standby routers send HSRP packets to the virtual router. If the active router fails, the standby router becomes the active router. The text Hello in and the text
Hello out indicate the hello packets received from and sent to the given IP address. Initially the router with IP address 10.5.5.1 is the active router, as indicated by the text Active router is 10.5.5.1.
The priority of the active router is 100, which is indicated by the text pri 100. However, when a hello packet from 10.5.5.2 is received, which has a higher priority (120) than the active router, the 10.5.5.2 router automatically and instantly becomes the active router. This implies that the router with the IP address 10.5.5.2 was the standby router and the standby preempt command was executed.
Objective:
Infrastructure Services Sub-Objective:
Configure and verify first-hop redundancy protocols
References:
Cisco IOS Debug Command Reference > debug sntp adjust Through debug tag-switching xtagatm vc > debug standby
Home > Support > Technology Support > IP > IP Application Services > Configure > Configuration Examples and Technotes > Avoiding HSRP Instability in a Switching Environment with Various Router Platforms > Troubleshoot > Troubleshooting Commands > Sample Debug Output
Home > Support > Technology Support > IP > IP Application Services > Design > Design Technotes > Understanding and Troubleshooting HSRP Problems in Catalyst Switch Networks > Understand HSRP
