Alcatel-Lucent 6850-48 Guida Di Rete
Configuring MPLS
Configuring MPLS
page 10-18
OmniSwitch AOS Release 6 Network Configuration Guide
September 2009
Configuring MPLS
The MPLS core network directs a flow of packets along a Label Switched Path (LSP) from an ingress
Label Switch Router (LSR) to an egress LSR through a transit LSR. This implementation of MPLS is
based on the Label Distribution Protocol (LDP) and depends on Layer 3 routing protocols such as RIP,
OSPF, ISIS, or Static Routes to set up LSPs through the core.
Label Switch Router (LSR) to an egress LSR through a transit LSR. This implementation of MPLS is
based on the Label Distribution Protocol (LDP) and depends on Layer 3 routing protocols such as RIP,
OSPF, ISIS, or Static Routes to set up LSPs through the core.
Configuring the MPLS network core using OmniSwitch routers requires the following steps:
• Configure the core IP network. Set up a stable IP network by configuring a routing protocol or static
routes. This task includes configuring the necessary VLANs, port assignments, and IP interfaces that
provide the connections over which MPLS tunnels will traverse. See
provide the connections over which MPLS tunnels will traverse. See
• Configure the system IP address on each LSR. The system IP address identifies a router as an MPLS
router that will participate in one or more LSPs. On the OmniSwitch, the “Loopback0” interface serves
as the system IP address and is configured on each OmniSwitch LSR (ingress, egress, or transit). See
the “Configuring IP” chapter in the OmniSwitch AOS Release 6 Network Configuration Guide for
information about how to configure the “Loopback0” interface.
as the system IP address and is configured on each OmniSwitch LSR (ingress, egress, or transit). See
the “Configuring IP” chapter in the OmniSwitch AOS Release 6 Network Configuration Guide for
information about how to configure the “Loopback0” interface.
• Install the Alcatel-Lucent software license for MPLS. A software license is required to run MPLS
on the OmniSwitch. See
• Enable the MPLS instance on the router. When the MPLS software license is installed on the
OmniSwitch, MPLS is globally enabled for the switch by default. Enabling or disabling the MPLS
instance is allowed. See
instance is allowed. See
• Enable the LDP instance on the router. When the MPLS software license is installed on the
OmniSwitch, LDP is also globally enabled for the switch by default. Enabling or disabling the LDP
instance is allowed. See
instance is allowed. See
.
• Configure MPLS LSPs (LDP or static). There are two methods for building MPLS LSPs: LDP
signaling and static LSPs. Static LSPs and LDP-signaled LSPs are mutually exclusive; a service is
associated with one type or the other. There are different configuration requirements and procedures for
each type of LSP. See
associated with one type or the other. There are different configuration requirements and procedures for
each type of LSP. See
for more information.
• Configure graceful restart (optional). Configuring switches with redundant CMMs for graceful
restart is described in
Once the MPLS core network of LSPs is constructed, the next step is to configure services. This imple-
mentation supports the provisioning of VPLS services over the IP/MPLS network. For more information
about provisioning VPLS over IP/MPLS, see the “Configuring VPLS” chapter in this guide.
mentation supports the provisioning of VPLS services over the IP/MPLS network. For more information
about provisioning VPLS over IP/MPLS, see the “Configuring VPLS” chapter in this guide.
At the end of the chapter is a simple MPLS network diagram with instructions on how it was created on a
router-by-router basis. See
router-by-router basis. See
for more information.