What are the reasons for the router packet loss?

[Aabheer]

If the router packet loss of multiple interfaces at the same time, when the issue is a headache. Routers to achieve the data exchange process is required between the different interfaces to send messages. Receives a packet routing switch for there is a vital role. In the Ethernet interface such as a router receives a packet will first get the MAC from the message header information, and then check the network layer packet header. The router will check whether the routing table and the packet destination address match the table entry. If the routing table has a matching table entry, then it will follow-up work. So, the router interface can receive the packet is the basis for its work. If the packet is lost, then the routing will greatly affect the switching function, eventually leading to data loss. So it will better to find out the reasons for the packed loss and then try to find the solution for the problem, I need help related to this issue.

[Milton.J]

Packet loss caused by many reasons, but the most important may be the router memory, or CPU overload caused. To solve this problem, you first need to determine cause of the problem.
First thing you should determine whether the problem is memory fragmentation caused by packet loss
Memory fragmentation refers to the router memory is divided into a number of non-contiguous blocks. He will lead to reduced memory utilization, in severe cases may produce memory errors, affecting the performance of the router. It will also lead to the router packet loss problem. In fact, there is not only the router's memory fragmentation problems, the ordinary hard disk is also the existence of such problems. Such as the Microsoft operating system comes with a defragmentation on the tools that can protect the user to defragment the hard disk of debris in order to enhance the hard disk storage capacity and storage performance. This refers to memory fragmentation is actually fragmented hard drive is similar.

[Spyrus]

How to determine whether there is fragmentation? This is mainly through the Cisco router comes with SHOW MEMORY command. This command displays the current memory related information. Such as the implementation of this command will display the current available memory (Free) and the maximum available soon (Largest) values. Network administrators to compare these two values, we can determine the performance impact of debris on the router. This is mainly to the router with the maximum available memory available to compare the size of the fast. If the router's available memory and the maximum size of available fast closer, it said that although there is debris, but little effect on the router. However, if the largest block of available small, as only the greatest can be a few one-tenth of the memory, then the router shows a more serious problem of memory fragmentation.

[Snake08]

According to me if the router's available memory for the 20M, while the largest available block size 15M, then said the router, there is a certain amount of memory fragments, but this fragment does not affect the normal operation of the router. If the available memory to 20M, while the largest available block 0.8M, then shows the router memory, there are more fragments. Continuous memory is not large enough to be used quickly, which could lead to serious memory allocation problems, such as one or more interfaces leading to intermittent loss of packets. Memory in the router, allows a certain degree of memory fragmentation.

[Zachary]

One of the simplest ways is to restart the router. The router is restarted, the router IOS system will re-allocate memory and cache space. After restarting, the network administrator and then look at the memory allocation process. Under normal circumstances, too much debris is due to the router is running a long time caused by overload. Only need to restart the look, we can solve the memory fragmentation problem.