交換機里有一個arp表，利用arp表可以找到與其相連的交換機的mac地址，然后再從mac端口對應表里找出端口

def getTrunk(ip,port,agent,communication):

macAddr = []

macList = []

portList = []

macStrList = []

linkPort = []

oid1 = (1,3,6,1,2,1,4,22,1,2)#ARP表oid

oid2 = (1,3,6,1,2,1,17,4,3,1,2)#mac端口對應表lid

gen = cmdgen.CommandGenerator()

errorIndication, errorStatus, errorIndex, varBinds = gen.nextCmd(

cmdgen.CommunityData(agent, communication,1),

cmdgen.UdpTransportTarget((ip,port)),

oid1,

)

#獲取ARP表里的mac地址

for varBind in varBinds:

for name,val in varBind:

macAddr.append(val.prettyPrint(0))

gen.ignoreNonIncreasingOid = True#讓oid可以非遞增

errorIndication, errorStatus, errorIndex, varBinds = gen.nextCmd(

cmdgen.CommunityData(agent, communication,1),

cmdgen.UdpTransportTarget((ip,port)),

oid2,

)

#獲取mac端口對應關系

for varBind in varBinds:

for name,val in varBind:

macList.append(name[-6:])

portList.append(val.prettyPrint())

#將十進制mac地址轉化為16進制的字符串

for item in macList:

temp = ''

for part in item:

temp += str(hex(int(part)))[2:]

temp = '0x' + temp

macStrList.append(temp)

for item in macAddr:#獲取端口號

if item in macStrList:

index = macStrList.index(item)

linkPort.append(portList[index])

#去除列表中的重復元素

linkPort = {}.fromkeys(linkPort).keys()#linkPort = list(set(linkPort))

return linkPort

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