交换机级联端口变化 引发无法上网（Switch cascading port changes caused no access to the Internet）.docVIP

交换机级联端口变化 引发无法上网（Switch cascading port changes caused no access to the Internet） Switch cascading port changes caused no access to the Internet 2010-7-23 10:30:53 source: enter the forum to add to Favorites Switch is one of the core hub devices in LAN, the number of switches used in LAN is relatively large, and the location of them may be more frequent. In such a working environment, the network administrator must make reasonable arrangements according to the characteristics and performance of the switch, because our random deployment may cause hidden trouble to the normal operation and maintenance of the network. Now, this article and we share a switch due to changes in the cascade port caused by the Internet can not be the case, in the hope that we can effectively manage LAN help. Fault phenomenon A LAN building larger, about 300 units around the computer distribution on each floor, each floor stationed units are not the same, there is only one floor unit, some floors up to four units including; in order to efficient management of building network, and to ensure that the various units in the building of Internet security, network the administrator selects the H3C S3050 type switch can be managed as a floor on the floor in the switch, and the switch unit according to the number of different, divided a virtual subnet separately for each unit, so that a unit within the network suffered a virus attack, it will not affect the normal access of other units at the same time, the network administrator in the network troubleshooting, only need to troubleshoot locking range in a virtual subnet, without the need for large Search, troubleshoot, and troubleshoot nodes. After the network administrators reasonable planning and correct configuration, all the units in the building work subnet can normally access the Internet network. However, some units have recently moved into the building, in order to ensure that these units can also be normal access to the Internet, network admi