table_manager.py 文件源码

def add_to_global_table(self, prefix, nexthop=None,
                            is_withdraw=False):
        src_ver_num = 1
        peer = None
        # set mandatory path attributes
        origin = BGPPathAttributeOrigin(BGP_ATTR_ORIGIN_IGP)
        aspath = BGPPathAttributeAsPath([[]])

        pathattrs = OrderedDict()
        pathattrs[BGP_ATTR_TYPE_ORIGIN] = origin
        pathattrs[BGP_ATTR_TYPE_AS_PATH] = aspath

        net = netaddr.IPNetwork(prefix)
        ip = str(net.ip)
        masklen = net.prefixlen
        if netaddr.valid_ipv4(ip):
            _nlri = IPAddrPrefix(masklen, ip)
            if nexthop is None:
                nexthop = '0.0.0.0'
            p = Ipv4Path
        else:
            _nlri = IP6AddrPrefix(masklen, ip)
            if nexthop is None:
                nexthop = '::'
            p = Ipv6Path

        new_path = p(peer, _nlri, src_ver_num,
                     pattrs=pathattrs, nexthop=nexthop,
                     is_withdraw=is_withdraw)

        # add to global ipv4 table and propagates to neighbors
        self.learn_path(new_path)