All company switches flash, can connect to the Internet, but there are some computers and mobile phones will be broken network (computer displays yellow exclamation mark), then half minutes network automatically restored, under this kind of circumstance how to deal with, please?

CodePudding user response:

Likely loop, screening for exchange and various equipment line is to produce circuit

CodePudding user response:

Company switch is more, I think, is there any way to can locate to which switch is there a problem?

CodePudding user response:

May 1, the arp attack the MAC computer without Internet gateway is normal

2, the loop

CodePudding user response:

Protect loop possibility is very large, probably through the command open loop, the loop DOWN related port automatically, or you can from gathering since check one by one put together the port line pull watch out that no crazy jump bottom allied that we have a problem, and then step by step DOWN

CodePudding user response:

have detected this afternoon loop, which is also have detected specific transceiver (because the transceiver cable pulled out without warning after the loop), but below the transceiver connecting all three switches on the roof ceiling, also not been disturbed, and the cable after pulled out all the lights will shine or frequent switch equipment, is that there is something wrong with the three switches?

CodePudding user response:

trouble you help to look at, I a small white one, don't know how to deal with,

CodePudding user response:

refer to 6th floor go_go_ response:

trouble you help to look at, I a small white one, don't know how to deal with,

The 4 if there's any problem, you first look at the switch and then given PC1 and PC2, see which have ARP attack,

CodePudding user response:

Show the log or see port traffic

CodePudding user response:

Off the PC1, 2 see if switch will flash off

CodePudding user response:

On a router can open ARP attack prevention first, on the three layers configuration loop configuration,

CodePudding user response:

Consider final point anyone to switches, routers and other equipment of the loop

CodePudding user response:

The network storm possibility is very large

CodePudding user response:

Net is broken when caught look, may be too much ARP broadcast packets