{"id":1578,"date":"2011-08-31T16:17:58","date_gmt":"2011-08-31T08:17:58","guid":{"rendered":"http:\/\/www.slyar.com\/blog\/?p=1578"},"modified":"2022-07-03T15:51:39","modified_gmt":"2022-07-03T22:51:39","slug":"ccnp-labs-bgp-ma-next-hop","status":"publish","type":"post","link":"http:\/\/www.slyar.com\/blog\/ccnp-labs-bgp-ma-next-hop.html","title":{"rendered":"CCNP\u5b9e\u9a8c:BGP\u8def\u7531\u5728MA\u7f51\u7edc\u4e0b\u4e00\u8df3\u5c5e\u6027(Next-Hop)\u7279\u4f8b"},"content":{"rendered":"<p>\u6587\u7ae0\u4f5c\u8005\uff1a<span style=\"color: #0000ff;\">\u59dc\u5357(Slyar) <\/span>\u6587\u7ae0\u6765\u6e90\uff1aSlyar Home (<a title=\"Slyar\" href=\"http:\/\/www.slyar.com\" target=\"_blank\" rel=\"noopener\">www.slyar.com<\/a>) \u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff0c\u8c22\u8c22\u5408\u4f5c\u3002<\/p>\n<p><span style=\"color: #0000ff;\">\u3010\u5b9e\u9a8c\u73af\u5883\u3011<\/span><\/p>\n<p>C3640-IK9O3S-M Version 12.4(10)<\/p>\n<p><span style=\"color: #0000ff;\">\u3010\u5b9e\u9a8c\u76ee\u7684\u3011<\/span><\/p>\n<p>\u9a8c\u8bc1BGP\u8def\u7531\u534f\u8bae\u5728MA\u7f51\u7edc\u4e2d\u4e0b\u4e00\u8df3\u5c5e\u6027(Next-Hop)\u81ea\u52a8\u66f4\u6539\u7279\u4f8b<\/p>\n<p><span style=\"color: #0000ff;\">\u3010\u5b9e\u9a8c\u62d3\u6251\u3011<\/span><\/p>\n<p><a href=\"http:\/\/www.slyar.com\/blog\/wp-content\/uploads\/2011\/08\/2011-08-30_191126.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1579\" title=\"BGP\u5728MA\u7f51\u7edc\" src=\"http:\/\/www.slyar.com\/blog\/wp-content\/uploads\/2011\/08\/2011-08-30_191126.png\" alt=\"\" width=\"505\" height=\"323\" srcset=\"http:\/\/www.slyar.com\/blog\/wp-content\/uploads\/2011\/08\/2011-08-30_191126.png 505w, http:\/\/www.slyar.com\/blog\/wp-content\/uploads\/2011\/08\/2011-08-30_191126-150x96.png 150w, http:\/\/www.slyar.com\/blog\/wp-content\/uploads\/2011\/08\/2011-08-30_191126-300x192.png 300w\" sizes=\"auto, (max-width: 505px) 100vw, 505px\" \/><\/a><\/p>\n<p><span style=\"color: #0000ff;\">\u3010\u5b9e\u9a8c\u63cf\u8ff0\u3011<\/span><\/p>\n<p>BGP\u5173\u7cfb\u5982\u56fe\uff0cR1\u3001R2\u3001R3\u5904\u5728\u540c\u4e00\u4ee5\u592a\u7f51\u4e2d(134.0.0.0\/24\u6bb5)\uff0cR2\u4e0eR3\u4e3aEBGP\u5173\u7cfb\uff0cR1\u4e0eR2\u4e3aIBGP\u5173\u7cfb\uff0cR1\u4e0eR4\u4f7f\u7528\u4e32\u884c\u94fe\u8def\u5efa\u7acbEBGP\u5173\u7cfb<\/p>\n<p>\u5b9e\u9a8c\u89c2\u5bdfR3\u4eceR2\u6536\u5230\u7684EBGP\u6761\u76ee\u7684\u4e0b\u4e00\u8df3\u5c5e\u6027\u5e76\u5206\u6790\u539f\u56e0<\/p>\n<p><!--more--><span style=\"color: #0000ff;\">\u3010\u5b9e\u9a8c\u6b65\u9aa4\u3011<\/span><\/p>\n<p><span style=\"color: #0000ff;\">1\u3001R1\u57fa\u672c\u914d\u7f6e\uff0c\u7aef\u53e3\uff0cEIGRP\uff0c\u4e0eR2\u7684IBGP\uff0c\u4e0eR4\u7684EBGP\uff1a<\/span><\/p>\n<p>!<br \/>\ninterface Loopback0<br \/>\nip address 1.1.1.1 255.255.255.255<br \/>\n!<br \/>\ninterface FastEthernet0\/0<br \/>\nip address 134.0.0.1 255.255.255.0<br \/>\n!<br \/>\ninterface Serial1\/0<br \/>\nip address 14.0.0.1 255.255.255.0<br \/>\nclock rate 64000<br \/>\n!<br \/>\nrouter eigrp 1<br \/>\nnetwork 1.1.1.1 0.0.0.0<br \/>\nnetwork 134.0.0.0 0.0.0.255<br \/>\nno auto-summary<br \/>\n!<br \/>\nrouter bgp 1<br \/>\nno synchronization<br \/>\nbgp router-id 1.1.1.1<br \/>\nneighbor 2.2.2.2 remote-as 1<br \/>\nneighbor 2.2.2.2 update-source Loopback0<br \/>\nneighbor 2.2.2.2 next-hop-self<br \/>\nneighbor 14.0.0.2 remote-as 4<br \/>\nno auto-summary<br \/>\n!<\/p>\n<p><span style=\"color: #0000ff;\">2\u3001R2\u57fa\u672c\u914d\u7f6e\uff0c\u7aef\u53e3\uff0cEIGRP\uff0c\u4e0eR1\u7684IBGP\uff0c\u4e0eR3\u7684EBGP\uff1a<\/span><\/p>\n<p>!<br \/>\ninterface Loopback0<br \/>\nip address 2.2.2.2 255.255.255.255<br \/>\n!<br \/>\ninterface FastEthernet0\/0<br \/>\nip address 134.0.0.2 255.255.255.0<br \/>\n!<br \/>\nrouter eigrp 1<br \/>\nnetwork 2.2.2.2 0.0.0.0<br \/>\nnetwork 134.0.0.0 0.0.0.255<br \/>\nno auto-summary<br \/>\n!<br \/>\nrouter bgp 1<br \/>\nno synchronization<br \/>\nbgp router-id 2.2.2.2<br \/>\nneighbor 1.1.1.1 remote-as 1<br \/>\nneighbor 1.1.1.1 update-source Loopback0<br \/>\nneighbor 1.1.1.1 next-hop-self<br \/>\nneighbor 134.0.0.3 remote-as 3<br \/>\nno auto-summary<br \/>\n!<\/p>\n<p><span style=\"color: #0000ff;\">3\u3001R3\u57fa\u672c\u914d\u7f6e\uff0c\u7aef\u53e3\uff0c\u4e0eR2\u7684EBGP\uff1a<\/span><\/p>\n<p>!<br \/>\ninterface Loopback0<br \/>\nip address 3.3.3.3 255.255.255.0<br \/>\n!<br \/>\ninterface FastEthernet0\/0<br \/>\nip address 134.0.0.3 255.255.255.0<br \/>\n!<br \/>\nrouter bgp 3<br \/>\nno synchronization<br \/>\nbgp router-id 3.3.3.3<br \/>\nnetwork 3.3.3.0 mask 255.255.255.0<br \/>\nneighbor 134.0.0.2 remote-as 1<br \/>\nno auto-summary<br \/>\n!<\/p>\n<p><span style=\"color: #0000ff;\">4\u3001R4\u57fa\u672c\u914d\u7f6e\uff0c\u7aef\u53e3\uff0c\u4e0eR1\u7684EBGP\uff1a<\/span><\/p>\n<p>!<br \/>\ninterface Loopback0<br \/>\nip address 4.4.4.4 255.255.255.0<br \/>\n!<br \/>\ninterface Serial1\/0<br \/>\nip address 14.0.0.2 255.255.255.0<br \/>\n!<br \/>\nrouter bgp 4<br \/>\nno synchronization<br \/>\nbgp router-id 4.4.4.4<br \/>\nnetwork 4.4.4.0 mask 255.255.255.0<br \/>\nneighbor 14.0.0.1 remote-as 1<br \/>\nno auto-summary<br \/>\n!<\/p>\n<p><span style=\"color: #0000ff;\">5\u3001\u5728R3\u4e0a\u9a8c\u8bc1\u4e0eR4\u7684\u8fde\u901a\u6027<\/span><\/p>\n<p>R3#ping 4.4.4.4 so 3.3.3.3<br \/>\nSending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:<br \/>\nPacket sent with a source address of 3.3.3.3<br \/>\n!!!!!<br \/>\nSuccess rate is 100 percent (5\/5), round-trip min\/avg\/max = 64\/83\/116 ms<\/p>\n<p><span style=\"color: #0000ff;\">6\u3001\u5728R3\u4e0a\u67e5\u770bBGP\u8def\u7531\u8868<\/span><\/p>\n<p>R3#sh ip bgp<br \/>\nBGP table version is 3, local router ID is 3.3.3.3<br \/>\nNetwork\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Next Hop\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Metric LocPrf Weight Path<br \/>\n*&gt; 3.3.3.0\/24\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 32768 i<br \/>\n*&gt; 4.4.4.0\/24\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 134.0.0.1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 1 4 i<\/p>\n<p><span style=\"color: #ff0000;\">\u6ce8\u610f\u52304.4.4.0\/24\u8fd9\u4e00\u6761\u8def\u7531\u662f\u4eceR2\u4e0a\u5b66\u6765\u7684\uff0cNext Hop\u5c5e\u6027\u672c\u5e94\u8be5\u4e3a134.0.0.2\u7684\uff0c\u73b0\u5728\u5374\u53d8\u6210\u4e86134.0.0.1<\/span><\/p>\n<p><span style=\"color: #0000ff;\">7\u3001\u5728R2\u4e0a\u4f7f\u7528debug\u5206\u6790BGP\u8def\u7531\u66f4\u65b0<\/span><\/p>\n<p>\/\/\u5f00\u542fBGP\u66f4\u65b0\u8c03\u8bd5<br \/>\nR2#debug ip bgp updates<br \/>\nBGP updates debugging is on for address family: IPv4 Unicast<\/p>\n<p>\/\/\u7531\u4e8eBGP\u4e3a\u89e6\u53d1\u66f4\u65b0\uff0c\u56e0\u6b64\u9700\u8981\u8f6f\u6e05\u9664\u4e00\u4e0bBGP\u8def\u7531\u8868<br \/>\nR2#clear ip bgp * soft<\/p>\n<p>*Mar\u00a0 1 00:44:21.315: BGP(0): 1.1.1.1 send UPDATE (format) 3.3.3.0\/24, next 2.2.2.2, metric 0, path 3<br \/>\n*Mar\u00a0 1 00:44:21.319: BGP(0): 134.0.0.3 NEXT_HOP part 3 net 4.4.4.0\/24, next 134.0.0.1<br \/>\n<span style=\"color: #800080;\">*Mar\u00a0 1 00:44:21.319: BGP(0): 134.0.0.3 send UPDATE (format) 4.4.4.0\/24, next 134.0.0.1, metric 0, path 4<\/span><\/p>\n<p><span style=\"color: #ff0000;\">\u4ecedebug\u4fe1\u606f\u53ef\u4ee5\u770b\u5230\uff0cR2\u5728\u5411R3\u53d1\u9001\u7684BGP\u8def\u7531\u66f4\u65b0\u4e2d\uff0c\u4e0b\u4e00\u8df3\u5c5e\u6027\u5c31\u5df2\u7ecf\u662f134.0.0.1\u4e86\uff0c\u518d\u770bR2\u7684\u8def\u7531\u8868\uff1a<\/span><\/p>\n<p>R2#sh ip ro<br \/>\n1.0.0.0\/32 is subnetted, 1 subnets<br \/>\n<span style=\"color: #800080;\">D\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1.1.1.1 [90\/156160] via 134.0.0.1<\/span>, 00:37:02, FastEthernet0\/0<br \/>\n2.0.0.0\/32 is subnetted, 1 subnets<br \/>\nC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2.2.2.2 is directly connected, Loopback0<br \/>\n3.0.0.0\/24 is subnetted, 1 subnets<br \/>\nB\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3.3.3.0 [20\/0] via 134.0.0.3, 00:18:57<br \/>\n4.0.0.0\/24 is subnetted, 1 subnets<br \/>\n<span style=\"color: #800080;\">B\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 4.4.4.0 [200\/0] via 1.1.1.1<\/span>, 00:20:18<br \/>\n134.0.0.0\/24 is subnetted, 1 subnets<br \/>\n<span style=\"color: #800080;\">C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 134.0.0.0 is directly connected, FastEthernet0\/0<\/span><\/p>\n<p><span style=\"color: #ff0000;\">\u8fd9\u91cc\u5c31\u662fBGP\u5728MA\u7f51\u7edc\u4e2d\u7684\u4e0b\u4e00\u8df3\u7279\u4f8b\u4e86\uff0c4.4.4.0\/24\u7f51\u6bb5\u7684\u8def\u7531\u662f\u901a\u8fc71.1.1.1\u8fdb\u884c\u8f6c\u53d1\u7684\uff0c\u800c\u7ecf\u8fc7\u8def\u7531\u8868\u7684\u9012\u5f52\u67e5\u8be2\uff0c1.1.1.1\u53c8\u662f\u7ecf\u8fc7134.0.0.1\u8fdb\u884c\u8f6c\u53d1\u7684\uff0c\u800cF0\/0\u63a5\u53e3\u53c8\u4e0e134.0.0.1\u5728\u540c\u4e00MA\u7f51\u7edc\uff0c\u56e0\u6b64BGP\u5c31\u5c06\u4e0b\u4e00\u8df3\u5c5e\u6027\u76f4\u63a5\u4f18\u5316\u4e3a\u8def\u7531\u66f4\u65b0\u6e90\u7684\u5730\u5740\u4e86\u3002<\/span><\/p>\n<p><span style=\"color: #ff0000;\">\u603b\u7ed3\uff1a\u5982\u679c\u6536\u5230BGP\u8def\u7531\u7684\u4e0b\u4e00\u8df3\u4e0e\u53d1\u51fa\u63a5\u53e3\u5728\u540c\u4e00MA\u7f51\u7edc\uff0c\u5c06\u53d1\u51fa\u8def\u7531\u4e0b\u4e00\u8df3\u76f4\u63a5\u6539\u4e3a\u6e90\u4e0b\u4e00\u8df3\u3002<\/span><\/p>\n<p>\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a<a href=\"http:\/\/www.slyar.com\/blog\">Slyar Home<\/a> &raquo; <a href=\"http:\/\/www.slyar.com\/blog\/ccnp-labs-bgp-ma-next-hop.html\">CCNP\u5b9e\u9a8c:BGP\u8def\u7531\u5728MA\u7f51\u7edc\u4e0b\u4e00\u8df3\u5c5e\u6027(Next-Hop)\u7279\u4f8b<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u4f5c\u8005\uff1a\u59dc\u5357(Slyar) \u6587\u7ae0\u6765\u6e90\uff1aSlyar Home (www.slyar.com) \u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff0c\u8c22\u8c22\u5408\u4f5c\u3002 \u3010\u5b9e\u9a8c\u73af\u5883\u3011 C3640-IK9O3S-M Version 12.4(10) \u3010\u5b9e\u9a8c\u76ee\u7684\u3011 \u9a8c\u8bc1BGP\u8def\u7531\u534f\u8bae\u5728MA\u7f51\u7edc\u4e2d\u4e0b\u4e00\u8df3\u5c5e\u6027 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1104],"tags":[300],"class_list":["post-1578","post","type-post","status-publish","format-standard","hentry","category-computer-networks","tag-300"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"CCNP\u5b9e\u9a8c:BGP\u8def\u7531\u5728MA\u7f51\u7edc\u4e0b\u4e00\u8df3\u5c5e\u6027(Next-Hop)\u7279\u4f8b\uff0c\u5982\u679c\u6536\u5230BGP\u8def\u7531\u7684\u4e0b\u4e00\u8df3\u4e0e\u53d1\u51fa\u53d1\u51fa\u63a5\u53e3\u5728\u540c\u4e00MA\u7f51\u7edc\uff0c\u5c06\u53d1\u51fa\u8def\u7531\u4e0b\u4e00\u8df3\u76f4\u63a5\u6539\u4e3a\u6e90\u4e0b\u4e00\u8df3\u3002\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Slyar\"\/>\n\t<meta name=\"keywords\" 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