No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


Due to the port negotiation problem lead to Internet lost packages seriously

Publication Date:  2019-07-17 Views:  155 Downloads:  0

Issue Description

A site tests the Eudemon8040, the butting equipment is C company’s switches, in the user testing found that the Internet package loss rate is about 30%.

Alarm Information


Handling Process

1, users Ping firewall found a large number of package loss, but Ping exchange did not appear package loss;
2, in the fire wall check if there is a package loss, found in firewall there is no package loss phenomenon;
3, check the configuration strategy is also no problem, delete all the strategies, the network is still a lot of package loss, judge it is no relationship with strategy;
4, consider whether the data package has been lost between switches and firewall, the log in C3500, discovery the port butted with firewall is UP and down ceaselessly;
4, because C3500 equipment is obsolete and version is low, consider that it may be the port negotiation problem;
5, through changing the negotiation mode of port, at last confirmed only the uses forced gigabit full duplex and Eudemon8040 interface uses autonegotiation mode can negotiate normally, other mode are all not successful.

Root Cause

1, firewall package loss;
2, strategy configuration reasons.


When butting with other equipments must consider the port negotiation problem, general our company’s equipments use the default mode, but need to consider special circumstances.