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Configuring MPLS on Provider Edge Switches Using IP Over MPLS (CLI Procedure)

You can configure MPLS on EX Series switches to increase transport efficiency in your network. MPLS services can be used to connect various sites to a backbone network or to ensure better performance for low-latency applications such as VoIP and other business-critical functions.

To implement MPLS on switches, you must configure two provider edge (PE) switches—an ingress PE switch and an egress PE switch—and at least one provider switch. You can configure customer edge (CE) interfaces on the PE switches of the MPLS network by using either IP over MPLS or MPLS over circuit cross-connect (CCC).

The main differences between configuring IP over MPLS and configuring MPLS over CCC are that for IP over MLPS you configure the customer edge interfaces to belong to family inet (rather than family ccc) and you configure a static route for the label-switched path (LSP). The configuration of the provider switch is the same regardless of whether you have used IP over MPLS or MPLS over CCC. See Configuring MPLS on Provider Switches (CLI Procedure).

This topic describes how to configure an ingress PE switch and an egress PE switch using IP over MPLS:

  1. Configuring the Ingress PE Switch
  2. Configuring the Egress PE Switch

Configuring the Ingress PE Switch

To configure the ingress PE switch:

  1. Configure an IP address for the loopback interface and for the core interfaces:
    [edit]
    user@switch# set interfaces lo0 unit 0 family inet address 100.100.100.100/32
    user@switch# set interfaces ge-0/0/5 unit 0 family inet address 10.1.5.1/24
    user@switch# set interfaces ge-0/0/6 unit 0 family inet address 10.1.6.1/24
  2. Configure OSPF on the loopback and core interfaces:
    [edit protocols]
    user@switch# set ospf area 0.0.0.0 interface lo0.0
    user@switch# set ospf area 0.0.0.0 interface ge-0/0/5.0
    user@switch# set ospf area 0.0.0.0 interface ge-0/0/6.0

    Note: If you want to use routed VLAN interfaces (RVIs) or Layer 3 subinterfaces as the core interfaces, replace ge-0/0/5.0 and ge-0/0/6 each with an RVI name (for example, vlan.logical-interface-number) or a subinterface name (for example, interface-name.logical-unit-number).

    RVIs function as logical routers, eliminating the need to have both a switch and a router. Layer 3 subinterfaces allow you to route traffic among multiple VLANs along a single trunk line that connects an EX Series switch to a Layer 2 switch.

  3. Enable traffic engineering for the routing protocol:
    [edit protocols]
    user@switch# set ospf traffic-engineering
  4. Configure RSVP on the loopback interface and the core interfaces:
    [edit protocols]
    user@switch# set rsvp interface lo0.0
    user@switch# set rsvp interface ge-0/0/5.0
    user@switch# set rsvp interface ge-0/0/6.0
  5. Configure MPLS traffic engineering:
    [edit protocols]
    user@switch# set protocols mpls traffic-engineering bgp-igp
  6. Configure MPLS on the core interfaces:
    [edit protocols]
    user@switch# set mpls interface ge-0/0/5.0
    user@switch# set mpls interface ge-0/0/6.0
  7. Configure family mpls on the logical units of the core interfaces, thereby identifying the interfaces that will be used for forwarding MPLS packets:
    [edit]
    user@switch# set interfaces ge-0/0/5 unit 0 family mpls
    user@switch# set interfaces ge-0/0/6 unit 0 family mpls
  8. Configure a customer edge interface as a Layer 3 routed interface, specifying an IP address:
    [edit]
    user@switch# set interfaces ge-2/0/3 unit 0 family inet 121.121.121.1/16
  9. Configure this Layer 3 customer edge interface for the routing protocol:
    [edit]
    user@switch# set protocols ospf area 0.0.0 interface ge-2/0/3.0
  10. Configure an LSP on the ingress PE switch (100.100.100.100) to send IP packets over MPLS to the egress PE switch (208.208.208.208):
    [edit protocols mpls]
    user@switch# set label-switched-path ip_lspjavae_29 from 100.100.100.100
    user@switch# set label-switched-path ip_lspjavae_29 to 208.208.208.208
  11. Disable constrained-path LSP computation for this LSP:
    [edit protocols mpls]
    user@switch# set label-switched-path ip_lspjavae_29 no-cspf
  12. Configure a static route from the ingress PE switch to the egress PE switch, thereby indicating to the routing protocol that the packets will be forwarded over the MPLS LSP that has been set up to that destination:

    Note: Do not configure a static route if you are using this procedure to configure an MPLS-based Layer 3 VPN.

    [edit]
    user@switch# set routing-options static route 2.2.2.0/24 next-hop 100.100.100.100
    user@switch# set routing-options static route 2.2.2.0/24 resolve

Configuring the Egress PE Switch

To configure the egress PE switch:

  1. Configure an IP address for the loopback interface and for the core interfaces:
    [edit]
    user@switch# set interfaces lo0 unit 0 family inet address 208.208.208.208/32
    user@switch# set interfaces ge-0/0/5 unit 0 family inet address 10.1.20.1/24
    user@switch# set interfaces ge-0/0/6 unit 0 family inet address 10.1.21.1/24
  2. Configure OSPF on the loopback interface (or switch address) and core interfaces:
    [edit protocols]
    user@switch# set ospf area 0.0.0.0 interface lo0.0
    user@switch# set ospf area 0.0.0.0 interface ge-0/0/5.0
    user@switch# set ospf area 0.0.0.0 interface ge-0/0/6.0

    Note: If you want to use routed VLAN interfaces (RVIs) or Layer 3 subinterfaces as the core interfaces, replace ge-0/0/5.0 and ge-0/0/6 each with an RVI name (for example, vlan.logical-interface-number) or a subinterface name (for example, interface-name.logical-unit-number).

    RVIs function as logical routers, eliminating the need to have both a switch and a router. Layer 3 subinterfaces allow you to route traffic among multiple VLANs along a single trunk line that connects an EX Series switch to a Layer 2 switch.

  3. Enable traffic engineering for the routing protocol:
    [edit protocols]
    user@switch# set ospf traffic-engineering
  4. Configure RSVP on the loopback interface and the core interfaces:
    [edit protocols]
    user@switch# set rsvp interface lo0.0
    user@switch# set rsvp interface ge-0/0/5.0
    user@switch# set rsvp interface ge-0/0/6.0
  5. Configure MPLS traffic engineering on both BGP and IGP destinations:
    [edit protocols]
    user@switch# set protocols mpls traffic-engineering bgp-igp
  6. Configure MPLS on the core interfaces:
    [edit protocols]
    user@switch# set mpls interface ge-0/0/5.0
    user@switch# set mpls interface ge-0/0/6.0
  7. Configure family mpls on the logical units of the core interfaces, thereby identifying the interfaces that will be used for forwarding MPLS packets:
    [edit]
    user@switch# set interfaces ge-0/0/5 unit 0 family mpls
    user@switch# set interfaces ge-0/0/6 unit 0 family mpls
  8. Configure a customer edge interface as a Layer 3 routed interface, specifying an IP address:
    [edit]
    user@switch# set interfaces ge-2/0/3 unit 0 family inet address 2.2.2.1/16
  9. Configure this Layer 3 customer edge interface for the routing protocol:
    [edit]
    user@switch# set protocols ospf area 0.0.0 interface ge-2/0/3
  10. Configure an LSP on the egress PE switch (208.208.208.208) to send IP packets over MPLS to the ingress PE switch (100.100.100.100):
    [edit protocols mpls]
    user@switch# set label-switched-path ip_lsp29_javae from 208.208.208.208
    user@switch# set label-switched-path ip_lsp29_javae to 100.100.100.100
  11. Disable constrained-path LSP computation for this LSP:
    [edit protocols mpls]
    user@switch# set label-switched-path ip_lsp29_javae no-cspf
  12. Configure a static route from the ingress PE switch to the egress PE switch, thereby indicating to the routing protocol that the packets will be forwarded over the MPLS LSP that has been set up to that destination:

    Note: Do not configure a static route if you are using this procedure to configure an MPLS-based Layer 3 VPN.

    [edit]
    user@switch# set routing-options static route 121.121.121.0/24 next-hop 208.208.208.208
    user@switch# set routing-options static route 121.121.121.0/24 resolve
 

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Published: 2014-04-23

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