What is IOS memory leak?
As per Apple, a memory leak is: Memory that was allocated at some point, but was never released and is no longer referenced by your app. Since there are no references to it, there’s now no way to release it and the memory can’t be used again.
What is memory allocation failure in IOS?
A memory allocation (malloc) failure occurs when the active controller does not have enough memory to run a stack unit. This failure may occur if you configure a large number of VLANs (for example, 4000) or STP instances (for example, 255) in the router image.
How do I check memory usage on Cisco?
To find memory usage due to the subprocesses and tasks operating under a specific process, use the show process memory detailed command. To sort for high activity usage, use the show process memory detailed sorted command. Memory usage can be monitored on a per-switch basis in a stacked environment.
How do you check utilization on a Cisco router interface?
Hi, try command “show interface summary” or for specific interface “show interface fa0/1 summary”.
What is memory leak in Cisco?
The Memory Leak Detector feature is a tool that can be used to detect memory leaks on a router that is running Cisco IOS software. The Memory Leak Detector feature is capable of finding leaks in all memory pools, packet buffers, and chunks.
What is memory leak in Cisco router?
How do I check the free memory on my Cisco router?
The show memory exec command is often used to check the amount of a router’s free memory. In troubleshooting cases where router performance is the focus, this is a major command used to see the statistics about the router’s memory.
How can you troubleshoot the problem of a high CPU utilization existing in a router?
Resolution
- Determine if you are able to issue the show commands on the router.
- Determine if the router is inaccessible and if this problem is reproducible.
- Determine if the router shows symptoms of high CPU utilization at brief and unpredictable intervals.
What is retain cycle in iOS?
Retain Cycle is the condition When 2 objects keep a reference to each other and are retained, it creates a retain cycle since both objects try to retain each other, making it impossible to release. Here The “Grandparent” retains the “parent” and “parent” retains the “child” where as “child” retains the “parent”..
What happens when memory allocation fails?
Answer: When we allocate memory from heap dynamically in a C++ program using new operator, the program crashes when memory is not available, or the system is not able to allocate memory to a program, as it throws an exception. So, to prevent program crash, we need to handle the exception when memory allocation fails.
Which command can be used to determine memory usage on a Cisco router?
The show memory exec command is often used to check the amount of a router’s free memory.
How do you check utilization on a Cisco switch port?
Use the show interface port-utilization command to view a real-time rate display for all ports on the switch. Example of a show interface port-utilization command listing shows a sample output from this command.
Do I need an account on Cisco to use the memory leak detector?
An account on Cisco.com is not required. The Memory Leak Detector feature is a tool that can be used to detect memory leaks on a router that is running Cisco IOS software. The Memory Leak Detector feature is capable of finding leaks in all memory pools, packet buffers, and chunks.
What is the memory leak detector feature?
The Memory Leak Detector feature is a tool that can be used to detect memory leaks on a router that is running Cisco IOS software. The Memory Leak Detector feature is capable of finding leaks in all memory pools, packet buffers, and chunks.
How do I find a memory leak on my router?
Memory Leak Detector. The Memory Leak Detector feature is a tool that can be used to detect memory leaks on a router that is running Cisco IOS software. The Memory Leak Detector feature is capable of finding leaks in all memory pools, packet buffers, and chunks. Your software release may not support all the features documented in this module.
Which Cisco devices are affected by the Cisco IOS XE CDP vulnerability?
This vulnerability affects devices that are running Cisco IOS XE Software Release 16.6.1 or 16.6.2 with the CDP feature enabled on at least one interface. The CDP feature is enabled in Cisco IOS XE on all interfaces by default.