1, fault phenomenon: the morning of June 5th, the entire core network failure,affect the company almost all systems.
2, temporary treatment: through the examination of the core switch log, foundthe core switches do not contact the main core switches, the virtual address toexchange main preemptive VRRP, resulting in line fault all VRRP VLAN. Forfast recovery business system, decided to temporarily shut down thepreparation of core switch
3, analysis of the phenomenon: VRRP two switches to the virtual IP address isthe broadcast storm caused by two reasons 1, heart line or port fault 2,standby switch equipment under the loop resulted from
4, find the reason:
Open equipment core switches, once again pulled out after all.
Using the serial line connected switches, run disp Inter, port Input message,found that G1/0/4 broadcast packets in particular
G1/0/4 below the floor 8 floor of the switch are respectively 192.168.1.80192.168.1.81 192.168.1.82 192.168.1.83 192.168.1.84, reset
Co inter under clear port statistics, and then run disp Inter, each port Input message view each switch, found that 192.168.1.83 twenty-second portbroadcast
192.168.1.83 22 corresponds to a switch in the conference room, found twointerface a cable received the switch on the formation of a loop.
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