Cisco Systems 1600R manual Supported Standards, MIBs, and RFCs, Prerequisites, Configuration Tasks

OSPF Sham-Link Support for MPLS VPN

Supported Standards, MIBs, and RFCs

Supported Standards, MIBs, and RFCs

Standards

No new or modified standards are supported by this feature.

MIBs

No new or modified MIBs are supported by this feature.

To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

RFCs

No new or modified RFCs are supported by this feature.

Prerequisites

Before you can configure a sham-link in an MPLS VPN, you must first enable OSPF as follows:

•Create an OSPF routing process.

•Specify the range of IP addresses to be associated with the routing process.

•Assign area IDs to be associated with the range of IP addresses.

For more information on these OSPF configuration procedures, go to:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fiprrp_r/1rfospf.htm

Configuration Tasks

See the following sections for configuration tasks for the sham-link feature. Each task in the list is identified as either required or optional.

•Creating a Sham-Link(required)

•Verifying Sham-Link Creation (optional)

Creating a Sham-Link

Before you create a sham-link between PE routers in an MPLS VPN, you must:

•Configure a separate /32 address on the remote PE so that OSPF packets can be sent over the VPN backbone to the remote end of the sham-link. The /32 address must meet the following criteria:

–Belong to a VRF.

–Not be advertised by OSPF.

–Be advertised by BGP.

You can use the /32 address for other sham-links.

•Associate the sham-link with an existing OSPF area.

Cisco IOS Release 12.2(8)T

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