Q: Factors of influence on CPU utilization of MA5200F/G.
1. The amount of online users at the equipment. Use “display access-user” command.
2. The system needs handle packets. These packets are: control packets influence including packets of users online/offline, packets handled by CPU of broadcast and multicast, packets with destination address as the host.
If packets are abnormal, the system will warn. Check with “ display trap” command at MA5200F, and with “diplay trapbuffer” command at MA5200G.
# [2005/09/01 18:23:30-] AAA-5-02042003:
Abnormal packets at user host IP: 184.108.40.206 MAC:00e0-4c8d-ebc8 Portvlan:FE2-101
If it prompts alarm above, it means user-host packets are abnormal and surpass user-host-car limit. The next IP address at port 2 101VLAN is 220.127.116.11. There is virus or attack in user’s machine with MAC 00e0-4c8d-ebc8.
Designate the number of user-host-car under the domain to limit user-host packets, and the number of host-car to limit network-side-host packets.
3. Frequent read flash causes information output. In some case there is much alarm information, it will replicate in flash or configure with local account when SDRAM is full (it can only store 100 lists). But there is no tftp server. When local bill pool is fool, the alarm of accounting-on failure will prompt and flash operation starts. There is loop in dual-layer topology, the host reports MAC conflict. Check alarm information when CPU utilization is high. If there is much alarm information in a short time, it is possible that the system reads flash continuously and results in high CPU utilization. For full bill pool, we need configure with one tftp server to replicate it:
e.g. a. bill replication
[MA5200F-local-aaa-server]cache-bill backup-mode tftp
b. interval of bill replication（default 720 minutes）:
[MA5200F-local-aaa-server]cache-bill backup-interval 120
c. parameters of bill server:
[MA5200F-local-aaa-server]bill-server 10.1.1.1 filename bill
Configuration of MA5200G is similar.
4. Two operation module of MA5200F（normal and simple）. Under normal module, use much resources of the system because it supports nat, pnp, user log and multi-media uploadinf. If the system is not configured with services above, it is suggested to use simple module to save resources.
The command for changing operation module:
STRING<1-127> File name
normal-version The normal version
simple-version The simple version
Execute the command and restart the equipment. When the system restarts, it is simple module.