Boys are favoured over girls

Boys are favoured over girls 重男轻女
今天看看新闻说【劳力输出有利各方】,其中提到 Boys are favoured over girls 的现象,才发现其实原来很多国家现在也一直存在重男轻女的现象~
现在的中国,农村重男轻女的现象好像也蛮多的~俺老家那个山沟沟就是,嘿嘿!
不过城市就不一样了,大家都想生个女孩,不担可以养老,还可以给老妈子当当背心
观念怎么差距就这么大呢?

FIB sources There are various entities in the system that can add routes to the FIB tables. Each of these entities is termed a source. When the same prefix is added by different sources the FIB must arbitrate between them to determine which source will contribute the forwarding information. Since each source determines the forwarding information using different best path and loop prevention algorithms, it is not correct for the forwarding information of multiple sources to be combined. Instead the FIB must choose to use the forwarding information from only one source. This choice is based on a static priority assignment 4. The FIB must maintain the information each source has added so it can be restored should that source become the best source. VPP has two control-plane sources; the API and the CLI the API has the higher priority. Each source data is represented by a fib_entry_src_t object of which a fib_entry_t maintains a sorted vector. The following configuration: set interface ip address GigabitEthernet0/8/0 192.168.1.1/24 results in the addition of two FIB entries; 192.168.1.0/24 which is connected and attached, and 192.168.1.1/32 which is connected and local (a.k.a. receive or for-us). A prefix is connected when it is applied to a router’s interface. Both prefixes are interface sourced. The interface source has a high priority, so the accidental or nefarious addition of identical prefixes does not prevent the router from correctly forwarding. Packets matching a connected prefix will generate an ARP request for the packets destination address, this process is known as a glean. An attached prefix also results in a glean, but the router does not have its own address in that sub-net. The following configuration will result in an attached route, which resolves via an attached path; ip route add table X 10.10.10.0/24 via gre0 as mentioned before, these are only appropriate for point-to-point links. If table X is not the table to which gre0 is bound, then this is the case of an attached export (see the section Attached Export). Adjacency source FIB entries Whenever an ARP entry is created it will source a fib_entry_t. In this case the route is of the form: ip route add table X 10.0.0.1/32 via 10.0.0.1 GigabitEthernet0/8/0 This is a host prefix with a path whose next-hop address is the same host. This route highlights the distinction between the route’s prefix - a description of the traffic to match - and the path - a description of where to send the matched traffic. Table X is the same table to which the interface is bound. FIB entries that are sourced by adjacencies are termed adj-fibs. The priority of the adjacency source is lower than the API source, so the following configuration: set interface address 192.168.1.1/24 GigabitEthernet0/8/0 ip arp 192.168.1.2 GigabitEthernet0/8/0 dead.dead.dead ip route add 192.168.1.2 via 10.10.10.10 GigabitEthernet1/8/0 will forward traffic for 192.168.1.2 via GigabitEthernet1/8/0. That is the route added by the control plane is favoured over the adjacency discovered by ARP. The control plane, with its associated authentication, is considered the authoritative source. To counter the nefarious addition of adj-fibs, through the nefarious injection of adjacencies, the FIB is also required to ensure that only adj-fibs whose less specific covering prefix is attached are installed in forwarding. This requires the use of cover tracking, where a route maintains a dependency relationship with the route that is its less specific cover. When this cover changes (i.e. there is a new covering route) or the forwarding information of the cover is updated, then the covered route is notified. Adj-fibs that fail this cover check are not installed in the fib_table_t’s forwarding table, they are only present in the non-forwarding table. Overlapping sub-nets are not supported, so no adj-fib has multiple paths. The control plane is expected to remove a prefix configured for an interface before the interface changes VRF.翻译一下
10-23
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