實驗手冊]MPLS/×××分解：防止PE-CE的路由環路???????????????? 2009-05-12 0:34? 附件: mpls-lab-1.7.zip [254.65 KiB] 被下載 46 次 附件: mpls-lab1_7.gif [ 56.27 KiB | 被瀏覽 154 次 ] Router CE1 and Router CE2 are located in the same OSPF area. These CE routers are linked together by a Layer 3 ××× over Router PE1 and Router PE2. In addition, Router CE1 and Router CE2 are connected by an intraarea link used as a backup. OSPF treats the link through the Layer 3 ××× as an interarea link. By default, OSPF prefers intraarea links to interarea links, so OSPF selects the backup intraarea link as the active path. This is not acceptable in configurations where the intraarea link is not the expected primary path for traffic between the CE routers. An OSPF sham link is also an intraarea link, except that it is configured between the PE routers. You can configure the metric for the sham link to ensure that the path over the Layer 3 ××× is preferred to a backup path over an intraarea link connecting the CE routers. 附件: ***l3-configa.gif [ 10.78 KiB | 被瀏覽 148 次 ] You should configure an OSPF sham link under the following circumstances: Two CE routers are linked together by a Layer 3 ×××. These CE routers are in the same OSPF area. An intraarea link is configured between the two CE routers. If there is no intraarea link between the CE routers, you do not need to configure an OSPF sham link. For more information on OSPF sham links, see the Internet draft draft-ietf-l3***-ospf-2547-01.txt, OSPF as the PE/CE Protocol in BGP/MPLS ×××s. 【ITAA學習組原創】

轉載于:https://blog.51cto.com/cisco/164359

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