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Catalyst 3750 Metro Switch Software Configuration Guide
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Chapter 30 Configuring MPLS and EoMPLS
Configuring MPLS VPNs
Configuring MPLS VPNs
This section includes this information about configuring MPLS VPNs on a Catalyst 3750 Metro switch
used as a PE router:
• Default MPLS Configuration, page 30-6
• MPLS VPN Configuration Guidelines, page 30-6
These sections describe the required tasks:
• Enabling MPLS, page 30-7
• Defining VPNs, page 30-8
• Configuring BGP Routing Sessions, page 30-9
• Configuring PE-to-PE Routing Sessions, page 30-9
You must also configure a PE to CE routing session. These sections provide example configurations:
• Configuring BGP PE-to-CE Routing Sessions, page 30-10
• Configuring RIP PE-to-CE Routing Sessions, page 30-10
• Configuring Static Route PE-to-CE Routing Sessions, page 30-11
For an example of packet flow in an MPLS VPN, see the “Packet Flow in an MPLS VPN” section on
page 30-11.
Default MPLS Configuration
By default, label switching of IPv4 packets along normally routed paths is globally enabled. MPLS
forwarding of IPv4 packets is disabled by default on interfaces.
If no distribution protocol is explicitly configured by the mpls label protocol global configuration
command, tag distribution protocol (TDP) is the default label distribution protocol for the switch. Cisco
recommends that you configure label distribution protocol (LDP) for MPLS.
If no protocol is explicitly configured for an interface, the default label distribution protocol for the
switch is used. By default, the labels of all destinations are advertised to all LDP neighbors.
No VRFs are defined. The default routing table for an interface is the global routing table.
MPLS VPN Configuration Guidelines
MPLS requires that CEF is enabled on the switch. CEF is enabled by default. For more information about
CEF, refer to the “Configuring Cisco Express Forwarding” section on page 28-86.
The switch must connect to the MPLS network through an ES port. MPLS configuration is supported
only on ES ports.
Do not configure VLAN mapping on an interface configured for MPLS.
The switch supports a total of 26 VRFs and VPNs.
VRFs are not compatible with the PBR template. If you configure the PBR template by entering the sdm
prefer routing-pbr command, any preconfigured VRFs are removed from the configuration. PBR and
VRFs cannot function on the same switch.
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