python利用pysnmp获取交换机级联接口

交换机里有一个arp表，利用arp表可以找到与其相连的交换机的mac地址，然后再从mac端口对应表里找出端口

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端口对应表lid        gen = cmdgen.CommandGenerator()    errorIndication, errorStatus, errorIndex, varBinds = gen.nextCmd(        cmdgen.CommunityData(agent, communication,1),        cmdgen.UdpTransportTarget((ip,port)),        oid1,        )    #获取ARP表里的mac地址    for varBind in varBinds:        for name,val in varBind:            macAddr.append(val.prettyPrint(0))        gen.ignoreNonIncreasingOid = True#让oid可以非递增    errorIndication, errorStatus, errorIndex, varBinds = gen.nextCmd(        cmdgen.CommunityData(agent, communication,1),        cmdgen.UdpTransportTarget((ip,port)),        oid2,        )    #获取mac端口对应关系    for varBind in varBinds:        for name,val in varBind:            macList.append(name[-6:])            portList.append(val.prettyPrint())    #将十进制mac地址转化为16进制的字符串    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:#获取端口号        if item in macStrList:            index = macStrList.index(item)            linkPort.append(portList[index])    #去除列表中的重复元素    linkPort = {}.fromkeys(linkPort).keys()#linkPort = list(set(linkPort))    return linkPort