\u3000\u3000MPLS(\u591a\u534f\u8bae\u6807\u7b7e\u4ea4\u6362\uff0cMultiprotocol Label Switching)<\/strong>\u662f\u4e00\u79cd\u57fa\u4e8e\u6807\u7b7e\u4ea4\u6362\u6280\u672f\u7684\u7f51\u7edc\u534f\u8bae\uff0c\u4e3b\u8981\u7528\u4e8e\u63d0\u9ad8\u6570\u636e\u5305\u8f6c\u53d1\u7684\u6548\u7387\u548c\u901f\u5ea6\u3002\u5176\u57fa\u672c\u539f\u7406\u548c\u4f5c\u7528\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\u3000\u3000MPLS\u5728\u6570\u636e\u5305\u7684\u5934\u90e8\u6dfb\u52a0\u4e00\u4e2a\u56fa\u5b9a\u957f\u5ea6\u7684\u6807\u7b7e(Label)\uff0c\u8fd9\u4e2a\u6807\u7b7e\u5305\u542b\u4e86\u8def\u7531\u5668\u5728\u7f51\u7edc\u4e2d\u4f20\u9001\u6570\u636e\u5305\u65f6\u6240\u9700\u7684\u4fe1\u606f\u3002\u6bcf\u4e2a\u6807\u7b7e\u90fd\u662f\u77ed\u800c\u5b9a\u957f\u7684\u3001\u53ea\u5177\u6709\u672c\u5730\u610f\u4e49\u7684\u3002<\/p>\n\n\n\n
\u3000\u3000\u6570\u636e\u5305\u5728\u7ecf\u8fc7\u5404\u4e2a\u8def\u7531\u5668\u65f6\uff0c\u8fd9\u4e9b\u8def\u7531\u5668\u4f1a\u6839\u636e\u6807\u7b7e\u6765\u51b3\u5b9a\u6570\u636e\u5305\u7684\u8f6c\u53d1\u8def\u5f84\uff0c\u800c\u4e0d\u662f\u50cf\u4f20\u7edfIP\u8def\u7531\u90a3\u6837\u9700\u8981\u8fdb\u884c\u590d\u6742\u7684\u67e5\u627e\u548c\u5206\u6790\u3002\u8fd9\u79cd\u673a\u5236\u4f7f\u5f97\u6570\u636e\u5305\u80fd\u591f\u6cbf\u7740\u9884\u5b9a\u7684\u8def\u5f84\u5feb\u901f\u4f20\u8f93\uff0c\u4ece\u800c\u663e\u8457\u63d0\u5347\u8f6c\u53d1\u6548\u7387\u3002<\/p>\n\n\n\n
\u3000\u3000\u6807\u7b7e\u901a\u8fc7\u6807\u7b7e\u5206\u53d1\u534f\u8bae(\u5982LDP\u3001RSVP-TE\u7b49)\u5728\u8def\u7531\u5668\u4e4b\u95f4\u8fdb\u884c\u5206\u53d1\u548c\u540c\u6b65\uff0c\u4ee5\u786e\u4fdd\u6240\u6709\u53c2\u4e0e\u7684\u6570\u636e\u5305\u90fd\u80fd\u6b63\u786e\u5730\u4f7f\u7528\u76f8\u5e94\u7684\u6807\u7b7e\u3002<\/p>\n\n\n\n
\u3000\u3000MPLS\u53ef\u4ee5\u5efa\u7acb\u9759\u6001\u6807\u7b7e\u4ea4\u6362\u8def\u5f84(LSP)\uff0c\u4e5f\u53ef\u4ee5\u5229\u7528\u52a8\u6001\u8def\u7531\u534f\u8bae\u548c\u6807\u7b7e\u5206\u53d1\u534f\u8bae\u6765\u52a8\u6001\u521b\u5efaLSP\u3002<\/p>\n\n\n\n
\u3000\u3000\u7531\u4e8e\u6807\u7b7e\u673a\u5236\u7684\u5f15\u5165\uff0c\u6570\u636e\u5305\u5728\u8def\u7531\u5668\u4e4b\u95f4\u7684\u8f6c\u53d1\u4e0d\u518d\u4f9d\u8d56\u4e8e\u590d\u6742\u7684\u8def\u7531\u67e5\u627e\uff0c\u800c\u662f\u901a\u8fc7\u7b80\u5355\u7684\u6807\u7b7e\u4ea4\u6362\u5b9e\u73b0\uff0c\u8fd9\u5927\u5927\u51cf\u5c11\u4e86\u8def\u7531\u5668\u7684\u5904\u7406\u65f6\u95f4\uff0c\u63d0\u9ad8\u4e86\u6570\u636e\u5305\u7684\u8f6c\u53d1\u901f\u5ea6\u3002<\/p>\n\n\n\n
\u3000\u3000MPLS\u5141\u8bb8\u7f51\u7edc\u7ba1\u7406\u5458\u66f4\u9ad8\u6548\u5730\u7ba1\u7406\u4e0d\u540c\u7c7b\u578b\u7684\u901a\u4fe1\u6d41\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u5355\u4e00\u7684\u6807\u7b7e\u6765\u63a7\u5236\u6d41\u91cf\u7684\u4f18\u5148\u7ea7\u548c\u670d\u52a1\u8d28\u91cf\u3002<\/p>\n\n\n\n
\u3000\u3000MPLS\u4e0d\u4ec5\u9002\u7528\u4e8eIP\u7f51\u7edc\uff0c\u8fd8\u53ef\u4ee5\u652f\u6301\u5176\u4ed6\u7c7b\u578b\u7684\u7f51\u7edc\u534f\u8bae\uff0c\u5982ATM\u3001FDDI\u7b49\uff0c\u56e0\u6b64\u5177\u6709\u5f88\u9ad8\u7684\u7075\u6d3b\u6027\u548c\u53ef\u6269\u5c55\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728IP\u9aa8\u5e72\u7f51\u4e0a\uff0cMPLS\u901a\u8fc7\u5c06IP\u5730\u5740\u6620\u5c04\u4e3a\u7b80\u77ed\u4e14\u957f\u5ea6\u56fa\u5b9a\u7684\u6807\u7b7e\uff0c\u8fdb\u4e00\u6b65\u63d0\u5347\u4e86\u7f51\u7edc\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000MPLS\u901a\u8fc7\u5f15\u5165\u6807\u7b7e\u4ea4\u6362\u673a\u5236\uff0c\u5b9e\u73b0\u4e86\u9ad8\u6548\u7684\u6570\u636e\u5305\u8f6c\u53d1\u548c\u7075\u6d3b\u7684\u7f51\u7edc\u7ba1\u7406\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u73b0\u4ee3\u4e92\u8054\u7f51\u548c\u4f01\u4e1a\u7f51\u7edc\u4e2d\uff0c\u4ee5\u6ee1\u8db3\u65e5\u76ca\u589e\u957f\u7684\u7f51\u7edc\u9700\u6c42\u3002<\/strong><\/p>\n\n\n\n
\u3000\u3000MPLS(\u591a\u534f\u8bae\u6807\u8bb0\u4ea4\u6362)\u534f\u8bae\u4e2d\u7684\u6807\u7b7e\u5206\u53d1\u673a\u5236\u662f\u5176\u6838\u5fc3\u7ec4\u6210\u90e8\u5206\u4e4b\u4e00\uff0c\u5176\u5de5\u4f5c\u539f\u7406\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u6b65\u9aa4\uff1a<\/p>\n\n\n\n
\u3000\u3000\u6807\u7b7e\u7531\u6807\u7b7e\u5206\u53d1\u534f\u8bae(LDP\u3001BGP-LS\u7b49)\u52a8\u6001\u5206\u914d\u3002\u6bcf\u4e2a\u8def\u7531\u5668\u6839\u636e\u4e00\u5b9a\u7684\u7b56\u7565\u4e3a\u8fdb\u5165\u7684\u6d41\u91cf\u5206\u914d\u4e00\u4e2a\u552f\u4e00\u7684\u6807\u7b7e\u503c\u3002<\/p>\n\n\n\n
\u3000\u3000\u6807\u7b7e\u901a\u5e38\u4f4d\u4e8e\u94fe\u8def\u5c42\u5305\u5934\u548c\u7f51\u7edc\u5c42\u5206\u7ec4\u4e4b\u95f4\uff0c\u957f\u5ea6\u4e3a4\u4e2a\u5b57\u8282\uff0c\u5305\u542b\u591a\u4e2a\u5b57\u6bb5\uff0c\u5982\u6807\u7b7e\u503c\u3001\u4fdd\u7559\u4f4d(Exp)\u3001\u6808\u5e95\u6307\u793a\u4f4d(S)\u7b49\u3002<\/p>\n\n\n\n
\u3000\u3000\u5165\u53e3\u8def\u7531\u5668(ingress LSR)\u6839\u636e\u5165\u7ad9\u63a5\u53e3\u548cFEC(\u8f6c\u53d1\u7b49\u4ef7\u7c7b)\u4fe1\u606f\u751f\u6210\u6807\u7b7e\uff0c\u5e76\u5c06\u5176\u6dfb\u52a0\u5230\u6570\u636e\u5305\u7684\u6807\u7b7e\u6808\u4e2d\u3002<\/p>\n\n\n\n
\u3000\u3000\u6807\u7b7e\u6620\u5c04\u5206\u4e3a\u4e24\u79cd\uff1a\u4e00\u79cd\u662f\u5728\u5165\u53e3\u8def\u7531\u5668\u5904\u8fdb\u884c\u7684\u6807\u7b7e\u6620\u5c04\uff0c\u53e6\u4e00\u79cd\u662f\u5728MPLS\u4f53\u7cfb\u7ed3\u6784\u57df\u5185\u8fdb\u884c\u7684\u6807\u7b7e\u6620\u5c04\u3002<\/p>\n\n\n\n
\u3000\u3000\u6bcf\u4e2a\u8def\u7531\u5668\u90fd\u4f1a\u7ef4\u62a4\u4e00\u4e2a\u6807\u7b7e\u8f6c\u53d1\u8868(LFIB)\uff0c\u8be5\u8868\u7531\u6807\u7b7e\u5206\u53d1\u534f\u8bae\u5efa\u7acb\u5e76\u8d1f\u8d23\u5e26MPLS\u6807\u7b7e\u62a5\u6587\u7684\u8f6c\u53d1\u3002<\/p>\n\n\n\n
\u3000\u3000\u5f53\u6536\u5230\u5e26\u6709\u6807\u7b7e\u7684IP\u62a5\u6587\u65f6\uff0c\u67e5\u627eFIB\u8868\uff0c\u5982\u679cTunnel ID\u4e3a0x0.\u5219\u8fdb\u884c\u666e\u901aIP\u8f6c\u53d1;\u5982\u679cTunnel ID\u4e3a\u975e0x0.\u5219\u8fdb\u884cMPLS\u8f6c\u53d1\u3002<\/p>\n\n\n\n
\u3000\u3000\u6570\u636e\u5305\u5728\u7ecf\u8fc7\u6bcf\u8df3\u4e00\u8df3\u7684\u8def\u7531\u5668\u65f6\uff0c\u8fd9\u4e9b\u8def\u7531\u5668\u4f1a\u6839\u636e\u6807\u7b7e\u6808\u4e2d\u7684\u6807\u7b7e\u503c\u8fdb\u884c\u6807\u7b7e\u4ea4\u6362\u64cd\u4f5c\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5f53\u524d\u8def\u7531\u5668\u4f1a\u5f39\u51fa\u6808\u9876\u7684\u6807\u7b7e\uff0c\u5e76\u5c06\u65b0\u7684\u6807\u7b7e\u538b\u5165\u6808\u4e2d\uff0c\u7136\u540e\u7ee7\u7eed\u8f6c\u53d1\u6570\u636e\u5305\u3002<\/p>\n\n\n\n
\u3000\u3000\u8fd9\u4e00\u8fc7\u7a0b\u786e\u4fdd\u4e86\u6570\u636e\u5305\u80fd\u591f\u5728\u4e0d\u540c\u8def\u7531\u5668\u4e4b\u95f4\u6b63\u786e\u5730\u4f20\u9012\u548c\u8f6c\u53d1\uff0c\u800c\u4e0d\u9700\u8981\u6bcf\u4e2a\u8def\u7531\u5668\u90fd\u91cd\u65b0\u8ba1\u7b97\u8def\u7531\u8def\u5f84\u3002<\/p>\n\n\n\n
\u3000\u3000\u5f53\u6570\u636e\u5305\u5230\u8fbe\u51fa\u53e3\u8def\u7531\u5668(egress LSR)\u65f6\uff0c\u51fa\u53e3\u8def\u7531\u5668\u4f1a\u5f39\u51fa\u6240\u6709\u6807\u7b7e\uff0c\u5e76\u5c06\u5269\u4f59\u7684\u6570\u636e\u5305\u8fdb\u884c\u666e\u901aIP\u8f6c\u53d1\u3002<\/p>\n\n\n\n
\u3000\u3000\u901a\u8fc7\u4e0a\u8ff0\u6b65\u9aa4\uff0cMPLS\u5b9e\u73b0\u4e86\u9ad8\u6548\u7684\u6570\u636e\u5305\u8f6c\u53d1\u673a\u5236\uff0c\u663e\u8457\u63d0\u9ad8\u4e86\u7f51\u7edc\u7684\u8f6c\u53d1\u901f\u5ea6\u548c\u7075\u6d3b\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728MPLS\u7f51\u7edc\u4e2d\u5b9e\u73b0\u9759\u6001\u4e0e\u52a8\u6001LSP\u7684\u5207\u6362\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
\u3000\u3000BFD\u53ef\u4ee5\u4e0eLSP\u8054\u52a8\uff0c\u5f53\u68c0\u6d4b\u5230\u94fe\u8def\u6545\u969c\u65f6\uff0c\u8fc5\u901f\u611f\u77e5\u5e76\u89e6\u53d1LSP\u7684\u5207\u6362\u3002\u4f8b\u5982\uff0c\u5728PE1\u4e0a\u914d\u7f6e\u5230PE2\u7684\u52a8\u6001LSP\uff0c\u5e76\u5efa\u7acbBFD\u4f1a\u8bdd\u8fdb\u884c\u68c0\u6d4b\uff0c\u540c\u65f6\u914d\u7f6eVPN FRR\u7b56\u7565\uff0c\u6307\u5b9a\u4fdd\u62a4\u8def\u5f84\u4e3aPE1\u5230PE3.\u5f53PE1\u5230P1\u6216\u8005P1\u5230PE2\u4e4b\u95f4\u7684\u94fe\u8def\u53d1\u751f\u6545\u969c\u65f6\uff0cPE1\u80fd\u8fc5\u901f\u611f\u77e5\u5230LSP\u6545\u969c\uff0c\u5e76\u89e6\u53d1VPN FRR\u5207\u6362\uff0c\u4f7f\u6d41\u91cf\u5207\u6362\u5230PE1\u5230PE3.<\/p>\n\n\n\n
\u3000\u3000\u5728\u8bbe\u5907\u4e0a\u4f7f\u80fdOSPF\u52a8\u6001\u8def\u7531\u534f\u8bae\uff0c\u901a\u8fc7\u52a8\u6001\u8def\u7531\u534f\u8bae\u6765\u5b9e\u73b0\u4e3b\u5907\u94fe\u8def\u7684\u5207\u6362\u3002\u5f53\u4e3b\u94fe\u8def\u53d1\u751f\u6545\u969c\u65f6\uff0cIGP\u8def\u7531\u548cLSP\u5747\u4f1a\u5207\u6362\u5230\u5907\u4efd\u94fe\u8def\u4e0a\u3002\u5f53\u4e3b\u94fe\u8def\u6062\u590d\u540e\uff0cLSP\u4f1a\u968f\u9759\u6001\u8def\u7531\u91cd\u65b0\u5207\u6362\u56de\u4e3b\u94fe\u8def\u3002<\/p>\n\n\n\n
\u3000\u3000\u5982\u679c\u5728lsra\u4e0a\u4f7f\u80fdldp\u4e0e\u9759\u6001\u8def\u7531\u8054\u52a8\uff0c\u5f53ldp\u4f1a\u8bdddown\u65f6\uff0c\u9759\u6001\u8def\u7531\u81ea\u52a8\u5207\u6362\u5230linkb\uff0c\u4f7flsp\u5207\u6362\u5230\u5907\u4efdlsp\uff0c\u4fdd\u8bc1\u6d41\u91cf\u4e0d\u4e2d\u65ad\u3002\u5f53lsra\u548clsrb\u4e4b\u95f4\u7684\u94fe\u8def\u6062\u590d\u65f6\uff0clsp\u4f1a\u968f\u9759\u6001\u8def\u7531\u5207\u6362\u56de\u4e3b\u94fe\u8def\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728ar1\u4e0a\u901a\u8fc7\u624b\u52a8\u8bbe\u7f6e\u9759\u6001\u8def\u7531\uff0c\u4f7f\u5f97\u8981\u53bb150.1.5.5.\u8d70\u4e0b\u4e00\u8df3155.1.12.2\u5230\u8fbear2;\u5728ar2\u4e0a\u56e0\u4e3aar2\u662flsp\uff1aar2->ar4\u7684ingress\u8bbe\u5907\uff0c\u9700\u8981\u624b\u52a8\u8bbe\u7f6elsp\u5bf9\u5e94\u7684fec\u7684\u672c\u5730\u8def\u7531\u8868\uff0c\u4e14\u8def\u7531\u7684\u4e0b\u4e00\u8df3\u4e0elsp\u6307\u5b9a\u7684\u4e0b\u4e00\u8df3\u76f8\u540c\uff0c\u4f7f\u5f97lsp\u751f\u6548\u3002<\/p>\n\n\n\n
\u3000\u3000\u542f\u7528\u81eaping\u529f\u80fd\u4e14LSP\u4fe1\u4ee4\u6210\u529f\u65f6\uff0cLSP\u4e0d\u4f1a\u7acb\u5373\u5207\u6362\uff0c\u800c\u662f\u7b49\u5230\u4e3aLSP\u914d\u7f6e\u7684\u81eaping\u6301\u7eed\u65f6\u95f4\u7ed3\u675f\u65f6\u624d\u8fdb\u884c\u5207\u6362\u3002\u8fd9\u6837\u53ef\u4ee5\u5728\u94fe\u8def\u6545\u969c\u68c0\u6d4b\u5230\u540e\uff0c\u6d41\u91cf\u7acb\u5373\u5207\u6362\u5230\u5907\u7528\u8def\u5f84\u3002<\/p>\n\n\n\n
\u3000\u3000MPLS(\u591a\u534f\u8bae\u6807\u7b7e\u4ea4\u6362)\u4e0d\u4ec5\u652f\u6301IP\u7f51\u7edc\uff0c\u8fd8\u652f\u6301\u591a\u79cd\u5176\u4ed6\u7c7b\u578b\u7684\u7f51\u7edc\u534f\u8bae\u3002MPLS\u53ef\u4ee5\u652f\u6301\u4ee5\u4e0b\u51e0\u79cd\u4e3b\u8981\u7684\u7f51\u7edc\u534f\u8bae\uff1a<\/p>\n\n\n\n
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