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Configuring a Sham Link

You can create an intra-area link or sham link between two provider edge (PE) routers so that the VPN backbone is preferred over the back-door link. Each sham link is identified by the combination of a local endpoint address and a remote endpoint address.

To configure a sham link, include the sham-link statement:




sham-link {
local address;
}

To configure the local endpoint address, specify the local option.

For a list of hierarchy levels at which you can include this statement, see the statement summary section for this statement.

To configure the remote endpoint address, include the sham-link-remote statement.




sham-link-remote address {

ipsec-sa name;

demand-circuit;

metric metric;
}

To configure the OSPF interface as a demand circuit, include the demand-circuit statement. To configure the remote endpoint metric value, include the metric statement. To configure IPsec authentication for the remote endpoint of a sham link, include the ipsec-sa name statement.

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