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Chapter 3
Configuring Remote Access to MPLS VPN
Prerequisites for RA to MPLS VPN
The RA to MPLS VPN feature has the following requirements:
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Note
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OL-2226-23
Your network must be running the following Cisco IOS services before you configure
VPN operation:
MPLS in the service provider backbone routers
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Tag distribution protocol (TDP) or the label distribution protocol (LDP)
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BGP in all routers providing a VPN service
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Cisco Express Forwarding (CEF) switching in each MPLS-enabled router
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IP CEF is on by default on the Cisco 10000 series router and it cannot be turned off. If you
attempt to enable IP CEF, an error appears.
For PPPoX to MPLS VPN networks, the Cisco 10000 series router must be running Cisco IOS
Release 12.2(4)BZ1 or later releases and the performance routing engine must be installed in the
router's chassis.
For ATM RBE to MPLS VPN networks, the Cisco 10000 series router must be running Cisco IOS
Release 12.2(15)BX or later releases and the performance routing engine must be installed in the
router's chassis.
You must configure DHCP option 82 support on the DHCP relay agent by using the ip dhcp relay
information option command before you can use the DHCP Option 82 support for the RBE feature.
Configure all the PE routers that belong to the same VPN with the same VPN ID. Make sure that the
VPN ID is unique to the service provider network.
Cisco 10000 Series Router Software Configuration Guide
Prerequisites for RA to MPLS VPN
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Troubleshooting
