An operator can choose to terminate GRE SDP tunnel packets directly on a router interface IP address. This is enabled by using the config router interface address <IP address> gre-termination command and is supported on the following platforms:
VSR-I
VSR-a
Services that support GRE SDP termination on the router interface IP address include the following:
VPRN services (spoke SDP and auto-bind-tunnel)
T-LDP signaled Ethernet VLL services
T-LDP signaled VPLS services
BGP-VPLS services
BGP-VPWS services
Only GRE SDP tunnel packets that have a destination IP that is equal to the /31 value of the IP address configured on the router interface can terminate on the router interface. For example, if the address is set to 1.2.3.4/24, only the single /31 address 1.2.3.4 is used for the GRE SDP tunnel packet to terminate on. GRE SDP termination on router interface IP addresses is not supported on loopback interfaces.
When T-LDP is used to signal services, the local-lsr-id must be set to the /31 value of the IP address of the router interface used for the GRE SDP tunnel packets to terminate on.
When BGP is used to advertise routes for services, the local-address for BGP sessions must be set to the /31 value of the IP address of the router interface used for the GRE-SDP tunnel packets to terminate on.