OSPF (Open Shortest Path First,\u958b\u653e\u6700\u77ed\u8def\u5f91\u512a\u5148)
ietf\u65bc1988\u767c\u5c55\u51fa,\u65bcrfc2328\u8a73\u8ff0
ip\u7684prot\u6b04\u4f4d\u70ba89,\u4e0d\u4f7f\u7528TCP\u548cUDP
AD=110
\u4f7f\u7528cost\u7576\u8861\u91cf\u6307\u6a19,cost=10\u76848\u6b21\u65b9\/bandwidth(bps),\u4e26\u652f\u63f4\u76f8\u540ccost\u7684\u591a\u91cd\u8def\u5f91
ex:\u983b\u5bec\u70ba1000kbps,metric\u70ba10^8\/1000*10^3=10
<\/p>\n\n\n\n
OSPFv3
\u50c5\u652f\u63f4ipv6,\u65bcrfc2740\u8a73\u8ff0,OSPFv2\u50c5\u652f\u63f4ipv4
SRF\u7fa4\u64ad\u4f4d\u5740\u70baff02::5,ospfv2\u70ba224.0.0.5
DR\u7fa4\u64ad\u4f4d\u5740\u70baff02::6,ospfv2\u70ba224.0.0.6
ps:
\u4e0d\u6703\u8981\u6c42\u76f8\u9130\u7684ipv6\u9130\u5c45\u4ecb\u9762\u70ba\u540c\u4e00\u500b\u7db2\u6bb5,\u4f46OSPFv2\u6703\u8981\u6c42
\u6bcf\u500b\u4ecb\u9762\u652f\u63f4\u591a\u500bOSPF\u7a0b\u5f0f,\u4f46OSPFv2\u4e0d\u884c<\/p>\n\n\n\n
\u7279\u8272<\/strong> \u4f7f\u7528\u7684\u6280\u8853\u5305\u62ec:<\/strong> …………………….. <\/p>\n\n\n\n \u3000 … <\/p>\n\n\n\n DR(designated router,\u6307\u5b9a\u8def\u7531\u5668):<\/strong> BDR(\u5099\u63f4\u6307\u5b9a\u8def\u7531\u5668):<\/strong> DROTHER<\/strong> DR\/BDR\u9078\u8209<\/strong> … <\/p>\n\n\n\n OSPF area<\/strong> area\u7684hiearchy\u67b6\u69cb\u3000<\/strong> hiearchy\u8a2d\u8a08\u5340\u57df\u597d\u8655<\/strong> ps: ………………..\u4f7f\u7528\u5169\u500b\u8cc7\u6599\u5eab<\/strong> \u4e3b\u8981\u6b65\u9a5f<\/strong> neighbor discovery<\/strong> \u5f62\u6210\u9130\u5c45\u5efa\u7acbadjacency\u7684\u5fc5\u8981\u689d\u4ef6<\/strong> timer<\/strong> OSPF\u5728\u4e0d\u540c\u7684\u7db2\u8def\u985e\u578b\u4e0b\uff0c\u4e0d\u540c\u7684\u53c3\u6578 <\/p>\n\n\n\n hello\u5c01\u5305\u6b04\u4f4d\u6709\uff1a<\/strong> … <\/p>\n\n\n\n LSA(link state advertisement,\u93c8\u8def\u72c0\u614b\u5ba3\u50b3)<\/strong> LSA type<\/strong> lsa type1\/router lsa:router link entry,\u7531router\u767c\u51fa, OSPF\u8a0a\u606f\u985e\u578b<\/strong> <\/p>\n\n\n\n OSPF\u72c0\u614b\u8868<\/strong> ps: ps: …….. OSPF\u8def\u5f91\u9078\u64c7\u7b56\u7565 <\/strong> \u9810\u8a2d\u8def\u5f91\u7684\u505a\u6cd5<\/strong> stub area(\u672b\u68a2\u578b\u5340\u57df) <\/strong> stub area\u9650\u5236<\/strong> ….. <\/p>\n\n\n\n external route\u7684\u6210\u672c\u8a08\u7b97\u65b9\u5f0f\u6709\u4ee5\u4e0b\u5169\u7a2e<\/strong> \u5f9e\u591a\u689d\u6210\u672c\u76f8\u540c\u7684E2\u8def\u5f91\u4e2d\u6c7a\u5b9a\u8def\u5f91<\/strong> ………….. <\/p>\n\n\n\n ospf virutal-link(\u865b\u64ec\u93c8\u8def)<\/strong> \u9023\u63a5virtual-link\u7684ABR<\/strong> transit area(\u4e2d\u7e7c\u5340\u57df)<\/strong> …………..<\/p>\n\n\n\n ospf\u5728frame-relay multipoint interface\u4e0a\u7684\u554f\u984c\u8207\u89e3\u6c7a\u65b9\u5f0f<\/p>\n\n\n\n \u9130\u5c45\u63a2\u7d22\u554f\u984c,\u5e38\u898b\u89e3\u6cd5\u6709\u4e8c\u7a2e OSPF (Open Shortest Path First …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[25],"tags":[],"class_list":["post-792","post","type-post","status-publish","format-standard","hentry","category-osi-layer3"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/792","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/comments?post=792"}],"version-history":[{"count":0,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/792\/revisions"}],"wp:attachment":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/media?parent=792"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/categories?post=792"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/tags?post=792"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\u53ea\u652f\u63f4ip,\u4e0d\u50cfeigrp\u652f\u63f4\u591a\u5354\u5b9a
\u7531area\u8207as\u7d44\u6210,\u56e0\u6b64ospf\u5e38\u4ee5\u968e\u5c64\u5f0f\u8a2d\u8a08
\u5177\u64f4\u5145\u6027
\u652f\u63f4vlsm\/cidr,\u652f\u63f4summarization
\u4e0d\u9650\u5236hop count
\u958b\u653e\u5f0f\u6a19\u6e96,\u53ef\u4f48\u5efa\u591a\u7a2e\u5ee0\u5546\u8a2d\u5099
\u53efbroadcast,multicast,unicast,\u800cmulticast\u4f4d\u7f6e\u70ba224.0.0.5(\u7528\u65bcSPF router)\u548c224.0.0.6(\u7528\u65bcDR)
ps:multicast\u7684ipv6\u4f4d\u7f6e\u70baff02::5\u548cff02::6<\/p>\n\n\n\n
initial flood:\u555f\u52d5\u6642\u8cc7\u6599\u5168\u9001,\u6253\u807d\u9130\u5c45\u662f\u8ab0,\u4f46\u9019\u53ef\u80fd\u4f7f\u7db2\u8def\u53d7\u5f71\u97ff
event-trigered(\u6fc0\u767c\u5f0f\u66f4\u65b0):\u6709\u4e8b\u624d\u767c\u8a0a\u865f,\u4e00\u6b21\u9001\u7d66\u5168\u90e8
spf(shortest path first tree,\u6700\u77ed\u8def\u5f91\u6a39):\u6f14\u7b97\u6cd5\u6703\u4f9d\u62d3\u6a38\u8cc7\u6599\u5eab\u548c\u983b\u5bec\u8a08\u7b97\u76ee\u5730\u6210\u672c,\u4e26\u5efa\u7acb\u8def\u7531\u8868<\/p>\n\n\n\n
RID(router id):<\/strong>
\u6bcf\u90e8\u8def\u7531\u5668\u90fd\u6709,id\u70ba\u4ecb\u9762\u6700\u9ad8\u7684ip,\u6c7a\u5b9a\u5f8c\u5373\u4e0d\u53d7\u5f71\u97ff,\u9664\u975e\u91cd\u958b\u6a5f
ps:\u82e5\u672a\u8a2dip\u6216\u4ecb\u9762\u95dc\u9589,\u5247\u627e\u4e0d\u5230rid
RID\u7684\u512a\u5148\u9806\u5e8f
1\u624b\u52d5\u6307\u5b9a
2up\u72c0\u614b\u7684loopback interface\u4e2d\u6578\u5b57\u6700\u5927\u7684IP
3up\u72c0\u614b\u7684\u975eloopback interface\u4e2d\u6578\u5b57\u6700\u5927\u7684IP
ps:
\u82e5\u5169\u8a2d\u5099rid\u76f8\u540c,\u5247\u6703\u8a31\u591a\u554f\u984c,\u50cf\u662f\u6301\u7e8c\u8a08\u7b97SPF,\u6301\u7e8c\u66f4\u65b0\u7b49\u6d88\u8017CPU\u8cc7\u6e90\u7b49\u52d5\u4f5c <\/p>\n\n\n\n
\u63a8\u9078\u51fa\u4f86\u548c\u5176\u4ed6\u8def\u7531\u5668adjacent(\u9130\u63a5)\u4e26\u4e92\u76f8\u4ea4\u63db\u8cc7\u8a0a,\u82e5\u6c92\u9130\u63a5\u5247\u4e0d\u4ea4\u63db\u8cc7\u8a0a
\u5efa\u7acbtype 2 network LSA\u4e26flooding\u5230\u8a72AREA
\u5354\u52a9\u8a72AREA\u4e0a\u62d3\u6a38\u8cc7\u6599\u7684\u4ea4\u63db<\/p>\n\n\n\n
\u53ea\u63a5\u6536\u4e0d\u6563\u64ad,\u4e26\u4fdd\u6301\u6700\u65b0\u8cc7\u8a0a\u4ee5\u9632DR\u58de\u6389\u53ef\u5373\u6642\u66f4\u65b0,\u82e5\u7121\u5247\u9078\u512a\u5148\u5ea6\u9ad8\u70babdr <\/p>\n\n\n\n
\u4e0d\u662fDR\u4e5f\u4e0d\u662fBDR\u7684router <\/p>\n\n\n\n
\u82e5\u7121DR\u5247BDR\u5347\u683cDR,\u82e5\u7121BDR\u5247\u9078\u6700\u4f73\u512a\u5148\u6b0a\u6210\u70baDR,\u6b21\u4f73\u512a\u5148\u6b0a\u70baBDR,
\u82e5\u6709\u76f8\u540c\u512a\u5148\u6b0a\u4ee5\u6700\u9ad8RID\u505a\u70baDR,\u6b21\u9ad8RID\u505a\u70baBDR
\u4e00\u65e6\u9078\u597dDR\u548cBDR\u5247\u4e0d\u6703\u6539\u8b8a,\u5c31\u7b97\u6709\u66f4\u9ad8\u512a\u5148\u7684router\u52a0\u5165\u4e5f\u662f
\u512a\u5148\u5ea60\u5247\u4e0d\u53c3\u8207DR\u9078\u64c7
ps:\u5404area\u6703\u9078\u81ea\u5df1\u7684DR\u53caBDR
ps:\u5efa\u8b70\u5c07loopback(\u56de\u9952\u754c\u9762)\u7684ip\u8a2d\u7684\u6bd4\u6240\u6709\u7db2\u8def\u754c\u9762\u9ad8,\u9019\u6a23\u6b64loopback ip\u6703\u6210\u70baRID
\u9019\u53ef\u907f\u514d\u82e5\u67d0RID\u7684\u4ecb\u9762\u4e0d\u7a69,\u90a3\u5c31\u6703\u4e00\u76f4\u505aDR\u548cBDR\u7684\u9078\u64c7,\u5c31\u7121\u6cd5\u6536\u6582
ps:\u9ede\u5c0d\u9ede\u7db2\u8def\u4e0d\u6703\u6307\u5b9a\u4efb\u4f55DR\/BDR,\u5305\u62ecNBMA\u9ede\u5c0d\u9ede\u7db2\u8def,NBMA\u9ede\u5c0d\u591a\u9ede\u7db2\u8def,\u4e00\u822c\u7684\u9ede\u5c0d\u9ede\u6216\u9ede\u5c0d\u591a\u9ede\u7db2\u8def<\/p>\n\n\n\n
\u662f\u4e00\u7fa4\u9130\u8fd1\u7684\u7db2\u8def\u8207\u8def\u7531\u5668
\u9664\u4e86stand\/ordinary(\u4e00\u822c) area\u5916\uff0c\u53e6\u6709\u4e8c\u7a2e\u7279\u6b8a\u7684area
\u3000backbone area\/area 0:ospf\u4e00\u5b9a\u8981\u6709area 0,as\u5167\u6240\u6709area\u90fd\u5fc5\u9808\u9023\u5230area 0\u3000
\u3000stub area
\u540carea\u4e2d\u6240\u6709router\u53ef\u5171\u4eab\u4e00\u500barea,router\u4e5f\u53ef\u540c\u6642\u5c6c\u65bc\u4e00\u500b\u4ee5\u4e0a\u7684area
\u540c\u4e00\u500barea\u7684router\u6703\u6709\u76f8\u540c\u7684\u62d3\u6a38\u8868,\u4e14\u8b8a\u52d5\u53ea\u4f5c\u7528\u5728\u76f8\u540c\u7684area,
ospf\u7684as\u7531ospf area\u7d44\u6210<\/p>\n\n\n\n
\u8def\u7531\u5668\u89d2\u8272\u5982\u4e0b:
backbone router(\u4e3b\u5e79\u8def\u7531\u5668)\uff1a\u81f3\u5c11\u6709\u4e00\u500b\u4ecb\u9762\u9023\u63a5\u5230area 0
internal router(\u5167\u90e8\u8def\u7531\u5668)\uff1arouter\u6240\u6709\u4ecb\u9762\u90fd\u5728\u540c\u4e00\u500barea
ABR(area broder router,\u5340\u9593\u8def\u7531\u5668)\uff1a
\u30001.\u5404\u4ecb\u9762\u5206\u5225\u9023\u5230\u4e0d\u540carea,\u4f46\u81f3\u5c11\u6709\u4e00\u4ecb\u9762\u9023\u5230area 0,
\u30002.\u8ca0\u8cac\u8f49\u9001area\u9593\u7684\u4e3b\u8981\u8def\u5f91\u8cc7\u8a0a,\u4f46area\u5167\u7684topology\u7d30\u7bc0\u4e0d\u6703\u8f49\u9001
\u30003.ABR\u7684LSDB\u5305\u542b\u6240\u9023\u63a5AREA\u7684LSA\u3000
ASBR(autonomous system border router,\u81ea\u4e3b\u7cfb\u7d71\u908a\u754c\u8def\u7531\u5668):\u548c\u5176\u4ed6as\u9023\u7d50\uff0c\u5c07\u5176\u4ed6as\u7684\u8def\u5f91(\u5916\u754c\u8def\u5f91)\u8cc7\u8a0a\u532f\u5165ospf\u7db2\u8def,<\/p>\n\n\n\n
confine network instability to an area(\u53ef\u5c07\u7db2\u8def\u7684\u4e0d\u7a69\u5b9a\u6027\u9650\u5236\u5728\u4e00\u5340\u57df\u5167)
improve performance\u3000
\u3000speed up convergence(\u52a0\u5feb\u6536\u6582):\u5c0f\u7684area\u6703\u6709\u5c0f\u7684topology db,\u53ef\u7528\u8f03\u5c11\u8cc7\u6e90\u7522\u751froute,\u6e1b\u5c11spf\u8a08\u7b97\u983b\u7387,\u800c\u4e14route table\u4e5f\u8f03\u5c0f
\u3000decrease routing overhead(\u4f4e\u9076\u9001\u7684\u984d\u5916\u8ca0\u64d4):type 1,2 lsa\u6703\u88ab\u9650\u5236\u5728area\u5167,\u4ee5\u6e1b\u5c11LSU\u7684\u8ca0\u64d4
\u64f4\u5145\u6027\u9ad8
\u5176\u4ed6\u9084\u6709\u4e0d\u592a\u788e\u5f31,packet are seq and ack,…\u7b49
ps:\u7f3a\u9ede\u662f\u8a2d\u8a08\u8907\u96dc<\/p>\n\n\n\n
The maximum number of routers per area depends on following:
1.What kind of area do you have?
2.What kind of CPU power do you have in that area?
3.What kind of media?
4.Will you be running OSPF in NBMA mode?
5.Is your NBMA network meshed?
6.Do you have a lot of external LSAs in the network?
7.Are other areas well summarized?<\/p>\n\n\n\n
topological database(\u62d3\u6a38\u8cc7\u6599\u5eab):\u6216\u7a31link state database(\u9023\u7d50\u72c0\u614b\u8cc7\u6599\u5eab)
\u3000router\u7528\u6b64\u8cc7\u8a0a\u8a08\u7b97\u51fa\u5404\u7db2\u8def\u6700\u77ed\u8def\u5f91
\u3000\u900f\u904ehello\u5c01\u5305\u548clsa\u5b8c\u6210\u53ca\u7dad\u8b77
\u3000\u6bcf\u500brouter\u6703\u76f8\u540c
neighborship database(\u9130\u5c45\u8cc7\u6599\u5eab):\u6216\u7a31adjacencies database\/Link State Adjacency table
\u3000\u542b\u6240\u6709router router\u6e05\u55ae,\u4ee5\u53ca\u5404router\u7684id,\u72c0\u614b,…\u7b49\u7d30\u7bc0
\u3000\u900f\u904ehello\u5c01\u5305\u5b8c\u6210\u53ca\u7dad\u8b77
\u3000\u6bcf\u500brouter\u4e0d\u4e00\u5b9a\u6703\u76f8\u540c
\u3000\u985e\u4f3ceigrp\u7684neighbor table<\/p>\n\n\n\n
1neighbor discovery:\u5c0b\u627e\u9130\u5c45\u4e26\u5b58\u9032neighborship database
2topology database exchange:\u5404\u8def\u7531\u5668\u5c07topology\u8cc7\u8a0a\u5132\u5b58\u81ea\u5df1\u7684topology database\/LSDB(link state database,\u93c8\u8def\u72c0\u614b\u8cc7\u6599\u5eab)
3.route computation:\u6839\u64daLSDB\u8cc7\u6599\uff0c\u4f7f\u7528SPF\u6f14\u7b97\u6cd5\u627e\u51fa\u6700\u77ed\u8def\u5f91
4.maintaining routing information(\u7dad\u8b77\u8def\u5f91\u8cc7\u8a0a) <\/p>\n\n\n\n
establish router adjacencies(\u5efa\u7acb\u8def\u7531\u5668\u7684\u76f8\u9023):\u900f\u904ehello\u5c01\u5305\u5efa\u7acb\u96d9\u65b9\u9023\u7d50\u7684\u95dc\u4fc2
\u30001,router\u52a0\u5165\u6642\u6703\u5411\u76f8\u9130router\u9001\u51fahello\u5c01\u5305,\u4f7f\u7528multicast223.0.0.5
\u30002,\u76f8\u9130router\u6536\u5230hello\u5c01\u5305\u5f8c\u7d00\u9304\u5230\u81ea\u5df1\u7684\u76f8\u9130\u8cc7\u6599\u5eab,\u4e26\u9001\u56dehello\u5c01\u5305\u7d66\u65b0\u52a0\u5165router
\u30003,\u65b0\u52a0\u5165router\u6536\u5230\u76f8\u9130router\u7684hello\u5c01\u5305\u5f8c\u4e5f\u7d00\u9304\u5230\u81ea\u5df1\u7684\u76f8\u9130\u8cc7\u6599\u5eab,\u65bc\u662f\u5f62\u6210adjacency(\u76f8\u9130\u95dc\u4fc2)
\u30004,\u9078dr\u548cbdr,\u82e5dr\u548cbdr\u5df1\u9078\u5b9a,\u5247\u65b0\u52a0\u5165\u7684router\u53ea\u6703\u548cdr\u8207bdr\u4ea4\u63db\u8cc7\u8a0a
\u30005,router\u900f\u904e\u9031\u671f\u7684hello update\u4f86\u7dad\u6301\u6574\u500b\u7db2\u8def\u7684\u904b\u4f5c
ps:nbma\u7b49\u975e\u5ee3\u64ad\u7684\u7db2\u8def\u9700\u8981\u624b\u52d5\u5efa\u7acbadjacency<\/p>\n\n\n\n
\u76f4\u9023\u4ecb\u9762\u4e0d\u53ef\u70bapassive interface
\u9700\u5728\u76f8\u540carea\u5167
hello timer\u53cadead timer\u9700\u76f8\u540c
router\u7684RID\u9700\u552f\u4e00
\u901a\u904e\u9a57\u8b49
stub area flag\u8981\u7b26\u5408
\u4ecb\u9762\u7684\u7db2\u8def\u985e\u578b\u8981\u4e00\u81f4
ps:
\u8981\u57fa\u672c\u901a\u8a0a\u80fd\u529b,ex:\u4ecb\u9762\u4e3b\u8981ip\u4f4d\u7f5d\u9700\u5c6c\u65bc\u76f8\u540c\u5b50\u7db2\u8def,\u624d\u53ef\u627e\u7684\u5230\u9130\u5c45
IP MTU\u9700\u4e00\u81f4\uff0c\u82e5\u6c92\u6709\u552f\u4e00\u5247\u7121\u6cd5\u4ea4\u63dbtopology\u8cc7\u6599
ps:
\u7121\u6cd5\u6210\u70ba\u9130\u5c45\u5efa\u7acbadjacency
\u53ef\u80fd\u662f\u7531\u65bc\u4efb\u4f55\u4e0b\u5217\u7406\u7531:Hello\u6c92\u6709\u5f9e\u9130\u5c45\u5169\u7aef\u50b3\u9001<\/p>\n\n\n\n
hello timer\u9810\u8a2d\u70ba10\u79d2\u9001\u4e00\u6b21hello
dead timer\u9810\u8a2d40\u79d2,hello timer\u76844\u500d,\u6b780\u5f8c\u5247\u9130\u5c45\u95dc\u4fc2\u4e2d\u6b62
ps:\u82e5\u4ecb\u9762\u5931\u53bb\u4f5c\u7528\u5247\u9130\u5c45\u95dc\u4fc2\u99ac\u4e0a\u5931\u6548\u3000<\/p>\n\n\n\ninterface
type <\/strong><\/td> \u4f7f\u7528
DR\/BDR<\/strong><\/td> hello
timer <\/strong><\/td>\u63a2\u7d22
\u9130\u5c45<\/strong><\/td>\u652f\u63f42\u53f0\u4ee5\u4e0arouter
\u5728\u540c\u4e00\u5b50\u7db2\u8def<\/strong> <\/td>\u61c9\u7528 <\/td><\/tr> broadcast
Multi access<\/td> Y<\/td> 10 <\/td> Y<\/td> Y<\/td> LAN
Token Ring <\/td><\/tr>Non-Broadcast
Multi Access
(NBMA)<\/td> Y <\/td> 30<\/td> <\/td> Y <\/td> Frame Relay
ATM
X.25 <\/td><\/tr>loopback<\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr> point-to-point<\/td> <\/td> 10 <\/td> Y <\/td> <\/td> PPP,HDLC
frame relay<\/td><\/tr>point-to-multipoint<\/td> <\/td> 30<\/td> Y<\/td> Y<\/td> Hub-and-Spoke\u67b6\u69cb
frame relay <\/td><\/tr>point-to-multipoint
non-broadcast
(cisco\u5c08\u5c6c)<\/td> <\/td> 30<\/td> <\/td> Y<\/td> <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
version
type
packet length
RID(router id)
area-id:
checksum
authentication password:\u9a57\u8b49\u5bc6\u78bc\u662f\u7576router\u9700\u4e92\u76f8\u9a57\u8b49\u6642\u7528
network mask
hello intervals:\u5e7e\u79d2\u50b3\u9001\u4e00\u6b21hello\u5c01\u5305,\u9810\u8a2d\u70ba10\u79d2,\u82e5\u70banbma\u524730\u79d2
option
router priority:\u9810\u8a2d\u70ba1,\u6b64\u503c\u6700\u9ad8\u7684router\u5373\u53ef\u505aDR
dead intervals:\u7b49\u5f85\u9130\u8fd1router\u7684\u6642\u9593,\u9810\u8a2d\u662fhello\u76844\u500d,\u82e5\u8d85\u904e\u6b64\u6642\u9593\u8868\u793a\u9130\u8fd1router\u672a\u56de\u61c9
dr:dr\u7684ip\u4f4d\u5740adjacency
bdr:bdr\u7684ip\u4f4d\u5740
neighbors:\u5df1\u7d93\u5efa\u7acb\u9130\u8fd1router\u7684\u8cc7\u6599
stub area flag:\u82e52\u500brouter\u5c6c\u76f8\u540cstub area\u9700\u8981\u6b64\u503c\u505a\u6e9d\u901a <\/p>\n\n\n\n
ospf\u8cc7\u6599\u5c01\u5305,\u542b\u8207\u5176\u4ed6ospf router\u5206\u4eab\u7684link state\u8207\u8def\u5f91\u8cc7\u8a0a,\u4f7f\u7528multicast\u65b9\u5f0f\u8655\u7406
ps:\u5404\u8def\u7531\u5668\u5c07\u9031\u671f\u6027\u6536\u5230lsp\u5f8c\u6703\u5c07\u8cc7\u8a0a\u5132\u5b58\u5728link state database
<\/p>\n\n\n\n
\u4f7f\u752832bit LSID(link state identifier,\u93c8\u8def\u72c0\u614b\u8b58\u5225\u78bc)\u8fa8\u8b58LSA\u3000
\u4e3b\u8981\u5206\u70ba
\u7528\u5728\u8a08\u7b97\u5167\u90e8\u8def\u5f91:lsa type1,2,3
\u7528\u5728\u8a08\u7b97\u5916\u90e8\u8def\u5f91:lsa type4,5,7<\/p>\n\n\n\n
\u3000type 1 lsa\u7684LSID=router\u672c\u8eab\u7684RID
\u3000area\u4e0b\u7684\u6bcf\u500brouter\u90fd\u6703\u8ca0\u8cac\u5efa\u7acb \u3000
\u3000router\u6703\u5c07\u6b64lsa flooding\u5230\u76f8\u540c\u7684area\uff0c\u4e00\u76f4\u5230area\u5167\u9130\u5c45\u90fd\u6709\u76f8\u540c\u7684lsa\u526f\u672c,\u3000
\u3000\u7528\u9014\uff1a\u63cf\u8ff0router\u672c\u8eab\u9023\u63a5\u5230\u7684area
lsa type2\/network lsa:network link entry,\u7531dr\u767c\u51fa
\u3000type2 lsa\u7684LSID=\u8a72AREA\u4e2dDR\u7684IP\u3000
\u3000\u8a72AREA\u4e2d\u7684DR\u6703\u8ca0\u8cac\u5efa\u7acb\u3000\u3000
\u3000OSPF\u5b9a\u7fa9typ2 lsa\u505a\u70bapseudonode(\u865b\u64ec\u7bc0\u9ede) \u3000
\u3000type2 lsa\u6703\u5217\u51fa\u6240\u6709\u76f8\u9023\u4e4btype 1 lsa\u7684\u53c3\u8003\u503c
\u3000\u7528\u9014\uff1a\u7dad\u8b77\u9023\u63a5\u5230\u8a72\u7db2\u8def\u7684router\u6e05\u55ae
lsa type3\/summary lsa:summary link entry,\u7531abr\u767c\u51fa
\u3000type3 lsa\u7684LSID=area\u8981\u901a\u544a\u7684\u5b50\u7db2\u8def
\u3000ABR\u6703\u8ca0\u8cac\u5c07\u76f8\u9130AREA\u5167\u7684\u5b50\u7db2\u8def\u5efa\u7acbtype3 lsa,\u4e26\u901a\u544a\u5230\u5176\u4ed6area
\u3000typ3 lsa\u6703\u542bABR\u7684RID\uff0c\u4ee5\u8b58\u5225\u662f\u90a3\u500bABR\u6240\u767c\u51fa\u3000
\u3000\u61c9\u7528\uff1a\u5728ABR\u4e0a\u624b\u52d5\u532f\u6574\u8def\u5f91\u6642\uff0c\u6703\u900f\u904etype3 lsa\u3000
lsa type4\/asbr summary lsa:summary link entry,\u7531abr\u767c\u51fa
\u3000type4 lsa\u7684LSID=ASBR\u7684rid
\u3000\u6703\u5305\u542basbr\u7684rid\uff0c\u4ee5\u53caABR\u5230ASBR\u7684\u6210\u672c
\u3000\u985e\u4f3ctype3 lsa\uff0c\u5dee\u5225\u5728type4 lsa\u662f\u901a\u544a\u4e00\u7b46\u5230\u9054ASBR\u7684\u8def\u5f91\u3000
\u3000\u61c9\u7528\uff1a
\u3000\u3000ABR\u6536\u5230type5 LSA\u5f8c\u6703\u8f49\u63db\u70batype4 lsa\uff0c\u4e26flooding\u5230\u76f8\u9130\u7684\u5340\u57df
\u3000\u3000\u7528\u4f86\u5354\u52a9\u8a08\u7b97E2\u985e\u578b\u7684\u5340\u57df\u9593external route \u3000 \u3000\u3000
lsa type5\/as external lsa:as extenal link entry,\u7531asbr\u767c\u51fa\u3000
\u3000\u8ca0\u8cac\u5c07\u5176\u4ed6AS\u7522\u751f\u6216\u5176\u4ed6\u8def\u7531\u5354\u5b9a\u5b78\u5230\u7684\u5916\u90e8\u8def\u5f91\u7f6e\u5165OSPF\u5167
\u3000\u61c9\u7528\uff1a\u5728ASBR\u4e0a\u624b\u52d5\u532f\u6574\u8def\u5f91\u6642\uff0c\u6703\u900f\u904etype5 lsa
\u3000\u6b04\u4f4d\u5305\u62ec\u4ee5\u4e0b
\u3000\u3000LSID\uff1a\u5b50\u7db2\u8def\u7de8\u865f
\u3000\u3000Mask\uff1a\u906e\u7f69
\u3000\u3000Advertising router\uff1a\u901a\u544a\u8def\u5f91\u7684ASBR\u4e4brid
\u3000\u3000Metric\uff1aASBR\u6307\u5b9a\u7684\u6b0a\u503c
\u3000\u3000External Metric Type\uff1a\u6307\u5b9aexternal type1\u6216type2
lsa type7\/nssa external lsa,\u7531asbr\u5728nssa\u5167\u767c\u51fa
\u3000\u985e\u4f3ctype5,\u53ef\u5c07\u5916\u90e8\u8def\u5f91\u7f6e\u5165nssa stub\u5340\u57df\u4e2d
\u3000\u7528\u4f86\u89e3\u6c7astub\u5340\u57df\u7121\u6cd5\u901a\u544alsa type5\u7684\u554f\u984c\u3000
ps:
lsa type 8\/external attributes:\u7528\u4f86\u9023\u63a5OSPF\u548cBGP BT4
lsa type 9,10,11\/oqaque:\u7528\u65bcOSPF\u7684\u5347\u7d1a\u64f4\u5145\u7b49
\u3000type 9:\u7528\u65bcIntra-Area-Prefix-LSA
\u3000type 10:\u7528\u65bcmpls<\/p>\n\n\n\n
hello:\u7de8\u865f1,\u63a2\u7d22\u53ca\u7dad\u8b77\u9130\u5c45,\u4e5f\u53ef\u6e2cdelay\u6642\u9593
DD\/DBD(database description,\u8cc7\u6599\u5eab\u63cf\u8ff0 ):\u7de8\u865f2,
\u30001.\u7528\u65bc\u521d\u59cb\u5316\u62d3\u6a38\u4ea4\u63db,
\u30002.\u5ba3\u544a\u50b3\u9001\u7aef\u4fee\u6539\u4e86\u4ec0\u9ebc
\u30003.\u50c5\u5217\u51faLSA header\u800c\u5df2,\u5305\u62ecLSID\u548c\u5e8f\u865f,\u6bcf\u7576LSA\u8b8a\u66f4\u6642,\u5e8f\u865f\u6703\u52a01,\u4e26\u958b\u59cbflooding DD\u8a0a\u606f
LSR(link-state request,\u93c8\u8def\u72c0\u614b\u8981\u6c42):\u7de8\u865f3,\u8981\u6c42\u5c0d\u65b9\u63d0\u4f9bLSA\u7684LSID\u5c01\u5305
LSU(link-state update,\u93c8\u8def\u72c0\u614b\u66f4\u65b0):\u7de8\u865f4,\u56de\u61c9LSR\u7684\u8acb\u6c42\u50b3\u9001\u8a72\u5c01\u5305,\u5176\u5167\u5bb9\u70ba\u5b8c\u6574\u7684LSA\u3000
LSack(link-state ack,\u93c8\u8def\u72c0\u614b\u78ba\u8a8d):\u7de8\u865f5,\u56de\u8986LSack\u4ee5\u78ba\u8a8d\u6536\u5230LSU\u7684\u56de\u61c9\u6642
ps:lsp(link state packet,\u93c8\u7d50\u72c0\u614b\u5c01\u5305) \u3000<\/p>\n\n\n\n
\u63a2\u7d22\u9130\u5c45\u76f8\u95dc\u72c0\u614b
\u3000down:dead timer\u6b780\u5f8c\u4e2d\u6b62\u9130\u5c45\u95dc\u4fc2\u7684\u72c0\u614b
\u3000attemp:\u624b\u52d5\u6307\u5b9a\u9130\u5c45\u6642,\u767c\u9001\u7aef\u50b3\u9001hello,\u4e26\u6536\u5230\u9130\u5c45hello\u4e4b\u524d\u7684\u72c0\u614b
\u3000init:\u9130\u5c45\u6536\u5230hello\u6642,\u767c\u73fe\u53c3\u6578\u4e0d\u4e00\u81f4\u6642\uff0c\u6703\u7522\u751f\u6b64\u72c0\u614b
\u30002way:\u9130\u5c45\u5df2\u5efa\u7acb
\u4ea4\u63dbLSDB\u76f8\u95dc\u72c0\u614b
\u3000ExStart:1\u5354\u5546\u76ee\u524dDD\u5e8f\u865f\uff0c2\u5354\u5546\u7528\u65bcDD\u5c01\u5305\u7684master\/slave
\u3000ExChange:\u5b8c\u6210DD\u7a0b\u5e8f\u4e26\u4ea4\u63dbDD\u5c01\u5305
\u3000Loading:\u6240\u6709DD\u5c01\u5305\u4ea4\u63db\u5b8c\uff0c\u4e14router\u6b63\u50b3\u9001LSR,LSU,LSack\u7528\u4f86\u4ea4\u63db\u5b8c\u6574\u7684LSA
\u3000Full:\u8207\u9130\u5c45\u5f62\u6210fully adjacent neighborship(\u5b8c\u5168\u76f8\u9130\u95dc\u4fc2)
ps:
\u82e5\u662f\u6709DR\u7684\u60c5\u6cc1\u4e0b,\u8207\u5176\u4ed6DROTHER\u53ea\u5230\u90542way\u72c0\u614b,\u53ea\u6709\u548cDR\u6703\u5230\u9054FULL\u72c0\u614b
\u5728\u6c92\u6709DR\u7684\u60c5\u6cc1\u4e0b,\u8207\u5176\u4ed6DROTHER\u6703\u5230\u9054FULL\u72c0\u614b <\/p>\n\n\n\n
\u4ea4\u63dbLSDB\u5c0d\u8c61<\/strong>
\u6709DR\u7684\u60c5\u6cc1
\u3000DROTHER\u53ea\u65bcDR\u4e92\u76f8\u4f5c\u696d,\u8a0a\u606f\u6703\u5148\u50b3\u5230DR\u7684mutli-address224.0.0.6,
\u3000\u63a5\u8457DR\u5728\u50b3\u9001\u8a0a\u606f\u5230SPF router\u7684multi-address224.0.0.5
\u7121DR\u7684\u60c5\u6cc1
\u3000DROTHER\u4e4b\u9593\u4e92\u76f8\u4f5c\u696d,\u8a0a\u606f\u6703\u50b3\u9001\u5230SPF router\u7684multi-address224.0.0.5
\u4ea4\u63dbLSDB\u7a0b\u5e8f<\/strong>
1.\u4ee5multicast\u50b3\u9001\u7b2c\u4e00\u500bDD,(\u76ee\u5730\u4f9d\u6709DR\u548c\u7121DR\u6703\u4e0d\u4e00\u6a23)
2.router\u8b8a\u70baExStart\u72c0\u614b,\u958b\u59cb\u627e\u4e00\u53f0\u8f03\u9ad8\u7684RID\u626e\u6f14Master\u89d2\u8272
3.router\u8b8a\u70baExChange\u72c0\u614b,\u4e26\u900f\u904eDD\u8a0a\u606f\u76f4\u5230\u96d9\u65b9\u5df2\u6536\u96c6\u5b8c\u8a72AREA\u4e4bLSID
4.router\u8b8a\u70baLoading\u72c0\u614b,\u6839\u64daLSID\u6e05\u55ae\u4e4b\u5167\u5bb9,\u91dd\u5c0d\u672a\u77e5\u6216\u5df2\u6539\u8b8a\u7684\u90e8\u4efd,\u4ea4\u63db\u5b8c\u6574\u7684LSA
\u30001\u7f3a\u5c11LSA\u7684\u4e00\u65b9\u50b3\u9001LSR
\u30002\u6709\u8a72LSA\u7684\u4e00\u65b9\u56de\u61c9LSU
\u30003\u6536\u5230LSU\u5f8c\u56de\u61c9LSack\u8868\u793a\u6536\u5df2\u6536\u5230
\u3000\u91cd\u89863\u500b\u6b65\u9a5f\u76f4\u5230\u6240\u6709LSA\u4e00\u81f4
5.router\u8b8a\u70baFULL\u72c0\u614b,\u9130\u5c45\u9593\u6709\u76f8\u540c\u7684LSDB
6.\u958b\u59cb\u57f7\u884cSPF\u6f14\u7b97\u6cd5
ps:
\u900f\u904eflooding\u8b93\u6240\u6709router\u6709\u6700\u65b0\u7684LSA,\u4e26\u9632\u6b62loop\u7684\u767c\u751f
\u9810\u8a2d30\u5206\u9418\u5167\u7121\u4efb\u4f55\u8b8a\u5316\uff0c\u5247\u6703\u81ea\u52d5\u57f7\u884c\u4e00\u6b21flooding\uff0c\u4e26\u589e\u52a0\u4e00\u6b21LSA\u5e8f\u865f
\u7576type3 lsa\u8b8a\u66f4\u6642SPF\u6f14\u7b97\u6cd5\u4e0d\u6703\u91cd\u7b97,\u53ea\u6709type1\u548ctype 2 lsa\u8b8a\u66f4\u6642\u624d\u6703
ps:
\u7576router\u6536\u5230LSU,\u82e5\u672c\u8eab
\u3000lsa entry\u4e0d\u5b58\u5728,\u6216\u6536\u5230\u7684LSU\u8f03\u65b0:\u5247\u5c07\u8a72entry\u52a0\u5165LSDB,\u4e26\u56de\u50b3LSAck,flooding\u8a72\u8cc7\u8a0a,\u57f7\u884cSPF,\u66f4\u65b0route table
\u3000\u6536\u5230\u7684LSU\u8f03\u820a:\u5247\u56de\u50b3\u8f03\u65b0\u7684LSU<\/p>\n\n\n\n
discover routes(\u767c\u73fe\u8def\u5f91)\/\u4ea4\u63dbLSDB\u7a0b\u5e8f:
\u30001,\u4e00\u822crouter\u9001\u51fa\u5e36\u6709RID\u7684hello\u5c01\u5305\u7d66DR
\u30002,dr\u5c07link state database(\u9023\u7d50\u72c0\u614b\u8cc7\u6599\u5eab)\u9001\u7d66\u4e00\u822crouter,\u4e00\u822crouter\u4e5f\u9001\u81ea\u5df1\u7684link state database\u7d66dr
\u30003,dr\u548c\u4e00\u822crouter\u6703\u4ea4\u63db\u4e00\u6b21\u4ee5\u4e0a\u7684dbd(database description packets),\u6700\u5f8c\u6703\u56de\u61c9lsack(link state ack)
\u30004,\u6240\u6709router\u90fd\u6709\u76f8\u540clink state database\u6642,\u5c31\u9032\u5165full state(\u5b8c\u5168\u72c0\u614b)\/full adjacency neighborship<\/p>\n\n\n\n
\u7570\u52d5\u904b\u4f5c\u904e\u7a0b
1\u5075\u6e2c\u5230\u767c\u73fe\u8b8a\u52d5\u7684router\u7528multicast 224.0.0.6\u50b3\u9001lsu(link state update)\u7d66dr\u548cbdr
2,dr\u6536\u5230\u8a0a\u606f\u5f8c\u7528multicast 224.0.0.5\u50b3\u9001lsu\u7d66\u5176\u4ed6router
3,\u4e00\u822crouter\u6536\u5230dr\u5e36\u6709\u7570\u52d5\u7684lsu\u5f8c,\u5247\u66f4\u65b0\u81ea\u5df1\u7684link state database,\u518d\u5efa\u7acb\u65b0\u7684route table <\/p>\n\n\n\n
1\u6210\u672c\u6700\u4f4e\u503c\u505a\u70ba\u8def\u5f91
\u4f9d\u4e0d\u540c\u5340\u57df\u6709\u4e0d\u540c\u7684\u8a08\u7b97\u65b9\u5f0f
\u3000intra-area(\u5340\u57df\u5167)\uff1a\u5c07\u7d93\u904e\u7684\u4ecb\u9762\u6210\u672c\u52a0\u7e3d,\u5f9etype2 lsa\u548ctype1 lsa\u7684\u8cc7\u6599\u53ef\u4ee5\u5f97\u77e5\u4ecb\u9762\u6210\u672c
\u3000interarea(\u5340\u57df\u9593)\uff1a\u8a08\u7b97\u5340\u57df\u5167route\u5230\u5340\u57df\u5167ABR\u7684\u6210\u672c(\u5217\u65bctype3 lsa)+abr\u5230asbr\u7684\u6210\u672c(\u5217\u65bctype4 lsa)
2\u76f8\u540c\u76ee\u5730,intra-area route\u512a\u65bcinterarea route <\/p>\n\n\n\n
1\u8b93\u6240\u6709\u6d41\u91cf,\u9810\u8a2d\u5c0e\u5230\u9023\u7d50internet\u7684ASBR
\u9023\u63a5\u5230internet\u7684ASBR,\u6703\u5c07\u8def\u5f91\u532f\u6574\u70ba0.0.0.0,\u4e26\u900f\u904etype 5 lsa\u516c\u544a\u5230\u6574\u500b\u7db2\u8def
2\u8b93stub area\u7684\u6d41\u91cf,\u9810\u8a2d\u5c0e\u5230\u7279\u5b9aarea\u5167\u7684ABR <\/p>\n\n\n\n
\u53ef\u7528\u505a\u9810\u8a2d\u8def\u5f91\uff0c\u7528\u4f86\u5c07stub area\u5167\u7684\u8cc7\u6599\u6d41\u5c0e\u5411\u5230\u8a72area\u7684\u5176\u4e2d\u4e00\u500babr
\u8a72area\u7684LSA\u6703\u6e1b\u5c11\uff0c\u4f7farea\u5167\u7684router\u6e1b\u7701memory\u53cacpu\u8cc7\u6e90
ABR\u6703\u904e\u6ffe\u6240\u6709\u9032\u5165\u8a72stub area\u7684type5 lsa
ABR\u6703\u5efa\u7acbtype3 lsa(\u542b0.0.0.0\/0\u7684default route)\u4e26flooding\u5230\u8a72stub area\u5167,
ps:\u53ea\u6709NSSA\u7684ABR\u4e0d\u6703\u81ea\u52d5\u5efa\u7acbtype3 lsa default route
stub type\u53ef\u5206\u70ba<\/strong>
\u3000stub:allow type1,2,3,4
\u3000NSSA(not-so-stubby areas):allow type1,2,3,4,7
\u3000totally stubby:allow type1,2,4
\u3000totally NSSA :allow type1,2,4,7
\u5176\u4e2d
totally\u8868\u793a\u6703\u904e\u6ffe\u9032\u5165\u8a72stub area\u7684type3 lsa(\u7528\u65bcdefaulte route\u7684type3 lsa\u9664\u5916),\u6b64\u985e\u578b\u70bacisco\u5c08\u5c6cstub\u3000
NSSA\u8868\u793a\u6703\u5c07\u5916\u90e8\u8def\u5f91\uff0c\u900f\u904eASBR\u8f49\u63db\u6210type7 lsa\u9001\u5230\u8a72stub area\u5167
\u800cnssa\u5167type7 lsa\u4e5f\u6703\u900f\u904e\u8a72area\u7684abr\uff0c\u8f49\u63db\u6210type5 lsa\u9001\u5230\u5176\u4ed6area <\/p>\n\n\n\n
\u4e0d\u53ef\u70baarea 0
\u4e0d\u53ef\u70bavirtual-link\u7684transit area
\u4e0d\u80fd\u6709ASBR<\/p>\n\n\n\n
E1\uff1aOSPF\u5916\u90e8\u6210\u672c+OSPF\u5167\u90e8\u6210\u672c \u3000
E2\uff1aOSPF\u5916\u90e8\u6210\u672c\u3000
ps:
\u5916\u90e8\u6210\u672c\u6839\u64datype5 lsa
\u5167\u90e8\u6210\u672c\u70barouter\u5230abr\u7684\u6210\u672c(\u6839\u64da\u5340\u57df\u5167\u7684lsdb\u62d3\u6a38)+abr\u5230asbr\u7684\u6210\u672c(\u6839\u64datype4 lsa)<\/p>\n\n\n\n
\u7576\u6709\u591a\u689d\u6210\u672c\u76f8\u540c\u7684e2\u8def\u5f91\u6642,router\u6839\u64da\u4ee5\u4e0b\u60c5\u6cc1\u6c7a\u5b9a\u4e00\u689d\u8def\u5f91
\u7576router\u8207asbr\u5728\u540c\u4e00area\u6642,\u6b65\u9a5f\u5982\u4e0b
\u30001\u5f9etype5 lsa\u88e1\u627e\u51faasbr\u7684rid
\u30002\u8a08\u7b97\u5230\u9054asbr\u6700\u4f4e\u6210\u672c\u8def\u5f91(\u6839\u64da\u5340\u57df\u5167\u7684lsdb\u62d3\u6a38),\u4e26\u6c7a\u5b9a\u5230asbr\u7684\u9023\u51fa\u4ecb\u9762\u8207\u4e0b\u4e00\u7ad9
\u7576router\u8207asbr\u5728\u4e0d\u540carea\u6642,\u6b65\u9a5f\u5982\u4e0b
\u30001\u8a08\u7b97\u5230\u9054abr\u6700\u4f4e\u6210\u672c\u8def\u5f91(\u6839\u64da\u5340\u57df\u5167\u7684lsdb\u62d3\u6a38),
\u30002\u8a08\u7b97abr\u5230\u9054asbr\u7684\u6210\u672c(\u6839\u64datype4 lsa)
\u30003\u6b65\u9a5f1\u7684\u503c+\u6b65\u9a5f2\u7684\u503c
ps:
abr\u6703\u5c07asbr\u516c\u544a\u7684type5 lsa\u8f49\u63db\u6210type4 lsa<\/p>\n\n\n\n
\u7528\u90141
\u8b93ospf\u652f\u63f4\u5169\u500barea 0\u7684\u60c5\u6cc1
virtual-link\u6703\u9023\u63a5\u5169\u500barea0\u7684abr
\u53ef\u89e3\u6c7a\u5169\u516c\u53f8\u5408\u4f75\u6642,\u540c\u6642\u6709\u5169\u500bospf area0\u7684\u72c0\u6cc1
\u7528\u90142
\u8b93ospf\u7684area\u53ef\u900f\u904e\u5176\u4ed6area,\u5728\u9023\u63a5\u5230area0(\u8b93\u5176\u4ed6area\u4e0d\u7528\u76f4\u63a5area0)
\u53ef\u89e3\u6c7a\u65b0\u589earea\u6642,\u56e0\u6210\u672c\u8003\u91cf\u800c\u4e0d\u76f4\u63a5\u9023area0<\/p>\n\n\n\n
1.\u4ee5\u55ae\u9ede\u50b3\u64ad\u7684\u65b9\u5f0f\u5c07\u6240\u6709OSPF\u8a0a\u606f\u50b3\u5230virtual-link\u7684\u53e6\u4e00\u500bABR
2.LSA\u88e1\u6709DNA(do not age,\u7121\u903e\u671f)\u4f4d\u5143,\u56e0\u6b64\u4e0d\u6703\u6bcf30\u5206\u9418\u91cd\u65b0flooding<\/p>\n\n\n\n
virtual-link\u9023\u63a5\u5169\u500barea\u7684\u5340\u57df
transit area\u4e0a\u4e0d\u53ef\u5b58\u5728stub area<\/p>\n\n\n\n
\u3000\u624b\u52d5\u6307\u5b9a\u9130\u5c45
\u3000\u8981\u6c42frame-relay\u4f7f\u7528broadcast\u7684\u53c3\u6578
\u3000ps:\u82e5\u4f7f\u7528\u5141\u8a31hello\u63a2\u7d22\u9130\u5c45\u7684OSPF\u7db2\u8def\u985e\u578b,\u5247\u8981\u78ba\u5b9a\u5df2\u4f7f\u7528InARP
\u9078\u4e0d\u5230DR\u7684\u554f\u984c,\u5e38\u898b\u89e3\u6c7a\u6709\u4e8c\u7a2e
\u3000\u907f\u514d\u4f7f\u7528DR\/BDR\u7684OSPF\u7db2\u8def\u985e\u578b
\u3000\u82e5\u662f\u4f7f\u7528DR\/BDR\u7684OSPF\u7db2\u8def\u985e\u578b,\u5247\u8981\u624b\u52d5\u6307\u5b9aDR\u548cBDR\u89d2\u8272\u907f\u514d\u554f\u984c\u767c\u751f
\u5169router\u6c92\u6709\u76f4\u9023\u7684\u554f\u984c
\u3000\u89e3\u6c7a\u65b9\u5f0f
\u3000\u5c07\u5df2\u9023\u63a5\u7684PVC(DLCI)\u5c0d\u61c9\u5230\u672a\u76f4\u9023router\u7684IP,\u900f\u904e\u5df2\u9023\u63a5\u7684PVC\u4e4b\u53e6\u4e00\u7aefrouter,\u5354\u52a9\u8f49\u9001\u8a0a\u606f\u5230\u672a\u76f4\u9023router<\/p>\n","protected":false},"excerpt":{"rendered":"