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Cisco Systems 1400 series manual

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Table of contents for the manual

  • Page 1

    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. This [...]

  • Page 2

    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 routers, all routing information learned from a VPN site is placed in the VPN routing and forwarding (VRF) instance associated with the incoming inter[...]

  • Page 3

    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. Because each site runs OSPF within the same Area 1 configuration, all routing between the three sites follows the intraarea path across the ba[...]

  • Page 4

    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 10.2.1.38 on Serial0/0/0, 00:00:17 ago Routing Descriptor Blo[...]

  • Page 5

    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. The PE ro[...]

  • Page 6

    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 . PE-1# show ip bgp vpnv4 all 10.3.1.7 BGP ro[...]

  • Page 7

    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 10.3.1.2, 0 dependencies, recursiv[...]

  • Page 8

    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. For this reason, you should not modify t[...]

  • Page 9

    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 3631 • Cisco 3640 • Cisco 3660 • Cico 3725 • Cisco 3745 • Cisco 7100 • Cisco 7200 • Cisco 7500 • Cisco 7700 • URM • Cisco uBR7200 [...]

  • Page 10

    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. T o obtain lists of supported MIBs by platform and Cisco IOS release, and to do [...]

  • Page 11

    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 that the sham-link w as successfully created and is operational, use the show ip ospf sham-links command in EXEC mode: Router1# show ip ospf sham-lin[...]

  • Page 12

    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 FULL (Hello suppressed) Index 2/2, retransmission queue length 4, number of retransmission 0 First 0x63311F3C(205)/0x63311FE4(59) Next 0x63311F3C(205)/[...]

  • Page 13

    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. T o remove the sham-link[...]

  • Page 14

    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 backbone by using the area sham-link cost command on each router: Router1(config)# interface loopback 55 Router1(config-if)# ip vrf forwarding v1 Router1(c[...]

  • Page 15

    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. show ip ospf sham-links Syntax Description [...]

  • Page 16

    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 . A router that is part of a customer network and that interfaces to a provide[...]