Using RSVP for VPN Signaling

To use the Resource Reservation Protocol (RSVP) for VPN signaling, perform the following steps:

1. On each PE router, configure traffic engineering. To do this, you must configure an interior gateway protocol (IGP) that supports traffic engineering (either IS-IS or OSPF) and enable traffic engineering support for that protocol.

   To enable OSPF traffic engineering support, include the traffic-engineering statement at the [edit protocols ospf] hierarchy level:

   [edit protocols ospf]

   traffic-engineering {

   shortcuts;

   }

   For IS-IS, traffic engineering support is enabled by default.

2. On each PE and P router, enable RSVP on the interfaces that participate in the label-switched path (LSP). On the PE router, these interfaces are the ingress and egress points to the LSP. On the P router, these interfaces connect the LSP between the PE routers. Do not enable RSVP on the interface between the PE and the CE routers, because this interface is not part of the LSP.

   To configure RSVP on the PE and P routers, include the interface statement at the [edit protocols rsvp] hierarchy level. Include one interface statement for each interface on which you are enabling RSVP.

   [edit protocols]

   rsvp {

   interface interface-name;

   interface interface-name;

   }

3. On each PE router, configure an MPLS LSP to the PE router that is the LSP’s egress point. To do this, include the label-switched-path and interface statements at the [edit protocols mpls] hierarchy level:

   [edit protocols]

   mpls {

   label-switched-path path-name {

   to ip-address;

   }

   interface interface-name;

   }

   In the to statement, specify the address of the LSP’s egress point, which is an address on the remote PE router.

   In the interface statement, specify the name of the interface (both the physical and logical portions). Include one interface statement for the interface associated with the LSP.

   When you configure the logical portion of the same interface at the [edit interfaces] hierarchy level, you must also configure the family mpls and family inet statements:

   [edit interfaces]

   interface-name {

   unit logical-unit-number {

   family inet;

   family mpls;

   }

   }

4. On all P routers that participate in the LSP, enable MPLS by including the interface statement at the [edit mpls] hierarchy level. Include one interface statement for each connection to the LSP.

   [edit]

   mpls {

   interface interface-name;

   interface interface-name;

   }

5. Enable MPLS on the interface between the PE and CE routers by including the interface statement at the [edit mpls] hierarchy level. Doing this allows the PE router to assign an MPLS label to traffic entering the LSP or to remove the label from traffic exiting the LSP.

   [edit]

   mpls {

   interface interface-name;

   }

   For information about configuring MPLS, see the JUNOS MPLS Applications Configuration Guide.