MA5200F version: MA2.10-7138 (independent of version)
Symptoms: Users under MA5200F access network very slowly, and their downloads reach 20-30KBps through bandwidth of 10M CAR. Remove MA5200 and users download through L3 switch directly, and the speed can reach 800-900KB. The tests use the same equipment, and the fixed IP address, as well as the same software and the same website.
1. Use the same devices, the same software, and the same access mode and the same website to perform contrast test. The download under L3 switch is faster than that under MA5200F; at the same time, all users under MA5200F report that their download is very slow, and it indicates that the upstream links of MA5200F or MA5200F is problematic.
2. Check the negotiation mode of interface of upstream link.
[MA5200F]display interface Ethernet 24
Ethernet24 current state: UP
Link layer protocol current state: UP
Description: TO-S2403H MTU is 1500; Keepalive interval is 10 (second); no Internet address is configured.
The transmitting format of IP packet is PKTFMT_ETHNT_2; the hardware is fast Ethernet 10/100Base-TX, and its MAC address is 00e0-fc**-****.
It supports auto-negotiation and half duplex; 100Mbps network cable type: auto-negotiation (straight-through and cross-over cables capable)
PPPoE server is bound with virtual template 1 at the interface.
It is found that the working mode negotiated by interfaces interconnecting MA5200F to L3 switch is 100M half duplex.
3. The working mode of interface of L3 switch is forced 100M full duplex. Change the working mode of interface of MA5200F to forced 100M full duplex. The command is:
[MA5200F]interface Ethernet 24
[MA5200F-if-ethernet24]undo negotiation auto
4. After another test, the users under MA5200F can reach 800-900KBps in download, the same as that under L3 switch. The problem is solved.
In the connection of two devices, if one device works in forced 100M full duplex, and the other works in auto-negotiation, the auto-negotiation side often negotiate to 100M half duplex. So, once users under MA5200 download slowly, and the test at upper layer equipment is normal, first check if both devices work in the same mode. The case is resulted from different interface working modes.