BGP协议的报文有哪些?各自有什么作用? BGP的主要功能是什么？它的报文有几种？BGP用这几种报文实...
bgp\u534f\u8bae\u7684\u56db\u79cd\u62a5\u6587\u662f\u4ec0\u4e48\uff1f(1) \u6253\u5f00(Open)\u62a5\u6587\uff0c\u7528\u6765\u4e0e\u76f8\u90bb\u7684\u53e6\u4e00\u4e2aBGP\u53d1\u8a00\u4eba\u5efa\u7acb\u5173\u7cfb\u3002
(2) \u66f4\u65b0(Update)\u62a5\u6587\uff0c\u7528\u6765\u53d1\u9001\u67d0\u4e00\u8def\u7531\u7684\u4fe1\u606f\uff0c\u4ee5\u53ca\u5217\u51fa\u8981\u64a4\u6d88\u7684\u591a\u6761\u8def\u7531\u3002
(3) \u4fdd\u6d3b(Keepalive)\u62a5\u6587\uff0c\u7528\u6765\u786e\u8ba4\u6253\u5f00\u62a5\u6587\u548c\u5468\u671f\u6027\u5730\u8bc1\u5b9e\u90bb\u7ad9\u5173\u7cfb\u3002
(4) \u901a\u77e5(Notificaton)\u62a5\u6587\uff0c\u7528\u6765\u53d1\u9001\u68c0\u6d4b\u5230\u7684\u5dee\u9519\u3002
BGP\u53eb\u8fb9\u754c\u7f51\u5173\u534f\u8bae\uff0c\u662f\u7528\u4e8eAS\u95f4\u7684\u4e00\u79cd\u8def\u7531\u534f\u8bae\u3002
ospf\u3001rip\u3001isis\u7b49\uff0c\u5747\u662f\u7528\u6765\u53d1\u73b0\u8def\u7531\u7684\u3002
\u800cBGP\u7684\u529f\u80fd\u4e3b\u8981\u662f\u7528\u6765\u7ba1\u7406\u8def\u7531\uff0c\u800c\u975e\u53d1\u73b0\u8def\u7531\uff0c\u7528\u4e8eisp\u4e4b\u95f4\u3002
\u62a5\u6587\u67094\u79cd\uff1aopen\uff0ckeepalive\uff0cupdate\uff0cnotification\u3002\u7528\u6b644\u4e2d\u62a5\u6587\uff0c\u67096\u79cd\u72b6\u6001\u673a\u3002
open\u7528\u6765\u5efa\u7acbbgp\u90bb\u5c45\u5173\u7cfb\uff0ckeepalive\u7528\u6765\u4fdd\u6301\u8fd9\u79cd\u8fde\u63a5\uff0cupdate\u7528\u6765\u53d1\u9001\u66f4\u65b0\u6216\u64a4\u9500\u7684\u8def\u7531\u6761\u76ee\uff0cnotification\u7528\u6765\u901a\u544a\u7f51\u7edc\u9519\u8bef\u3002
\u4e00\u4e2a\u5178\u578b\u7684\u8fc7\u7a0b\u4e3a\uff1aIdle(\u542f\u52a8\u6d88\u606f)->Connect(TCP\u8fde\u63a5\u6210\u529f\uff0c\u53d1OPEN)->OpenSent(\u6536\u5230OPEN\u6d88\u606f\uff0c\u534f\u5546\u6210\u529f)->OpenConfirm(\u6536\u5230KEEPALIVE\u6d88\u606f)->Established(TCP\u8fde\u63a5\u5173\u95ed\uff0c\u6709\u9519\u8bef\uff0c\u6216\u5904\u7406UPDATE\u6d88\u606f\u5931\u8d25\uff0c\u6216\u6536\u5230NOTIFICATION\u6d88\u606f)->Idle
Keepalive ---每隔60S发送一次。hold time=180S
Update ---information for one path only (could be to multiple networks)
---Includes path attributes and networks
Notification
---when error is detected
---BGP connection is closed after sent
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