Cisco Systemsメーカー1400 seriesの使用説明書/サービス説明書
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1 Cisco IOS Release 12.2(8)T OSPF Sham-Link Support for MPLS VPN Feature History This document describes how to conf igure and use a sham-link to connect V irtual Priv ate Network (VPN) client sites that run the Open Shortest Path First (OSPF) protocol and share backdoor OSPF links in a Multiprotocol Label Switching (MPLS) VPN conf iguration.
OSPF Sham-Link Support for MPLS VPN Feature Overview 2 Cisco IOS Release 12.2(8)T Figur e 1 OSPF Connectivity Between VPN Client Sit es and an MPLS VPN Backbone When OSPF is used to connect PE and CE .
OSPF Sham-Link Support for MPLS VPN Feature Overview 3 Cisco IOS Release 12.2(8)T Figur e 2 Backdoor P aths Between OSPF Client Sites For example, Figure 2 shows three client sites, each with backdoor links.
OSPF Sham-Link Support for MPLS VPN Feature Overview 4 Cisco IOS Release 12.2(8)T PE-1# show ip route vrf ospf 10.3.1.7 Routing entry for 10.3.1.7/32 Known via "ospf 100", distance 110, metric 86, type intra area Redistributing via bgp 215 Advertised by bgp 215 Last update from 10.
OSPF Sham-Link Support for MPLS VPN Feature Overview 5 Cisco IOS Release 12.2(8)T Figur e 3 Using a Sham-Link Between PE Rout ers to Connect OSPF Client Sit es Because the sham-link is seen as an intra-area link between PE routers, an OSPF adjacency is created and database exchange (for the particular OSPF process) occurs across the link.
OSPF Sham-Link Support for MPLS VPN Feature Overview 6 Cisco IOS Release 12.2(8)T Figur e 4 Sham-Link Example The following example shows the forwarding that occurs between sites from the standpoint of how PE-1 views the 10.3.1.7/32 prefix, the loopback1 interface of the Winchester CE router in Figure 4 .
OSPF Sham-Link Support for MPLS VPN Feature Overview 7 Cisco IOS Release 12.2(8)T PE-1# show ip cef vrf ospf 10.3.1.7 10.3.1.7/32, version 73, epoch 0, cached adjacency to POS3/0/0 0 packets, 0 bytes tag information set local tag: VPN-route-head fast tag rewrite with PO3/0/0, point2point, tags imposed: {42 38} via 10.
OSPF Sham-Link Support for MPLS VPN Supported Platforms 8 Cisco IOS Release 12.2(8)T Restrictions When OSPF is used as a protocol between PE and CE routers, the OSPF metric is preserved when routes are advertised o ver the VPN backbone. The metric is used on the remote PE routers to select the correct route.
OSPF Sham-Link Support for MPLS VPN Supported Platforms 9 Cisco IOS Release 12.2(8)T • Cisco 1721 • Cisco 1750 • Cisco 1751 • Cisco 2420 • Cisco 2600 • Cisco 2691 • Cisco 3620 • Cisco .
OSPF Sham-Link Support for MPLS VPN Supported Standards, MIBs, and RFCs 10 Cisco IOS Release 12.2(8)T Supported Standards, MIBs, and RFCs Standards No new or modif ied standards are supported by this feature. MIBs No new or modif ied MIBs are supported by this feature.
OSPF Sham-Link Support for MPLS VPN Configuration Tasks 11 Cisco IOS Release 12.2(8)T T o create a sham-link, use the follo wing commands starting in EXEC mode: Verifying Sham-Link Creation T o verify.
OSPF Sham-Link Support for MPLS VPN Monitoring and Maintaining a Sham-Link 12 Cisco IOS Release 12.2(8)T Timer intervals configured, Hello 10, Dead 40, Wait 40, Hello due in 00:00:04 Adjacency State F.
OSPF Sham-Link Support for MPLS VPN area sham-link cost 13 Cisco IOS Release 12.2(8)T area sham-link cost T o conf igure a sham-link interface on a provider edge (PE) router in a Multiprotocol Label Switching (MPLS) V irtual Priv ate Network (VPN) backbone, use the ar ea sham-link cost command in global conf iguration mode.
OSPF Sham-Link Support for MPLS VPN area sham-link cost 14 Cisco IOS Release 12.2(8)T Examples The following e xample sho ws ho w to conf igure a sham-link between tw o PE routers in an MPLS VPN backb.
OSPF Sham-Link Support for MPLS VPN show ip ospf sham-links 15 Cisco IOS Release 12.2(8)T show ip ospf sham-links T o display information about all sham-links conf igured for a provider edge (PE) router in the V irtual Priv ate Netw ork (VPN) backbone, use the show ip ospf sham-links command in EXEC mode.
OSPF Sham-Link Support for MPLS VPN Glossary 16 Cisco IOS Release 12.2(8)T Glossary BGP —Border Gate way Protocol. Interdomain routing protocol that exchanges reachability information with other BGP systems. It is def ined in RFC 1163. CE router —customer edge router .
デバイスCisco Systems 1400 seriesの購入後に(又は購入する前であっても)重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります:
Cisco Systems 1400 seriesをまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはCisco Systems 1400 seriesの技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。Cisco Systems 1400 seriesの取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。Cisco Systems 1400 seriesで得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
Cisco Systems 1400 seriesを既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はCisco Systems 1400 seriesの不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、Cisco Systems 1400 seriesに関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちCisco Systems 1400 seriesデバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。