BGP内隐退出

Question

以下是Wang等人关于隐式退出的定义。在“压力下BGP行为的观察与分析”一文中。

我不明白的是，我如何计算隐式提款？例如，如果下面显示的4条BGP消息具有相同的IP地址和不同的AS-PATH属性，那么我有多少隐式取款？是3号吗？还是6岁？在计算隐式撤回时，我是否只查看连续消息，还是看第一条消息涉及其余信息，而不是第二条消息涉及其余部分，第三条消息涉及第四条？

如果我查看连续消息，结果将是3，如果我使用第二种方法，结果是6。

帮帮忙，Jannine

TIME: 2001-9-16 00:00:06
TYPE: BGP4MP/BGP4MP_MESSAGE AFI_IP
FROM: 192.65.185.144
TO: 192.65.185.40
BGP PACKET TYPE: UPDATE
ORIGIN: IGP
AS_PATH: 6893 8938 1 297
NEXT_HOP: 192.65.185.144
ANNOUNCED: 192.152.102.0/24

TIME: 2001-9-16 00:00:18
TYPE: BGP4MP/BGP4MP_MESSAGE AFI_IP
FROM: 192.65.184.3
TO: 192.65.185.40
BGP PACKET TYPE: UPDATE
ORIGIN: IGP
AS_PATH: 513 10764 6509 297
NEXT_HOP: 192.65.185.9
ANNOUNCED: 192.152.102.0/24

TIME: 2001-9-16 00:00:36
TYPE: BGP4MP/BGP4MP_MESSAGE AFI_IP
FROM: 192.65.185.144
TO: 192.65.185.40
BGP PACKET TYPE: UPDATE
ORIGIN: IGP
AS_PATH: 6893 3561 209 297
NEXT_HOP: 192.65.185.144
ANNOUNCED: 192.152.102.0/24

TIME: 2001-9-16 00:00:44
TYPE: BGP4MP/BGP4MP_MESSAGE AFI_IP
FROM: 192.65.185.130
TO: 192.65.185.40
BGP PACKET TYPE: UPDATE
ORIGIN: IGP
AS_PATH: 559 8933 6509 297
NEXT_HOP: 192.65.185.130
ANNOUNCED: 192.152.102.0/24


Implicit Withdrawal Definition:If the sender announces a route
to a previously unreachable address, this is a new
announcement. If the sender announces a route to
a currently reachable address and the new route is
identical to the current route, this is a duplicate
announcement. Otherwise, the sender is replacing
the current route with a new route and this is an
implicit withdrawal.

Answer 1

对于给定的消息，它将是3。第一条消息包含一个更新，如果您目前没有该前缀的路由，那么这将是我们安装的第一个路由。随后的消息包含相同前缀的信息，因此是隐式取款。