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Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 20 Configuring L2 Virtual Private Networks
Configuration Tasks for L2VPN
Configuring HDLC and PPP over MPLS
With HDLC over MPLS, the entire HDLC packet is transported. The ingress PE router removes only the
HDLC flags and frame check sequence (FCS) bits. The contents of the packet are not used or changed.
With PPP over MPLS, the ingress PE router removes the flags, address, control field, and the FCS.
HDLC over MPLS is described in:
• Restrictions for HDLC over MPLS, page 20-36
• Restrictions for PPP over MPLS, page 20-36
• Configuring HDLC over MPLS or PPP over MPLS, page 20-36
Restrictions for HDLC over MPLS
The following restrictions pertain to the HDLC over MPLS feature:
• Asynchronous interfaces: Asynchronous interfaces are not supported.
• Interface configuration: You must configure HDLC over MPLS on router interfaces only. You
cannot configure HDLC over MPLS on subinterfaces.
Restrictions for PPP over MPLS
The following restrictions pertain to the PPP over MPLS feature:
• Asynchronous interfaces—Are not supported. The connections between the CE and PE routers on
both ends of the backbone must have similar link layer characteristics. The connections between the
CE and PE routers must both be synchronous.
• Multilink PPP (MLP)—Is not supported.
• Interface configuration: You must configure PPP on router interfaces only. You cannot configure
PPP on subinterfaces.
Configuring HDLC over MPLS or PPP over MPLS
To configure HDLC over MPLS or PPP over MPLS, enter the following commands beginning in global
configuration mode:
Command Purpose
Step 1
Router(config)# interface serial slot/port
Specifies a serial interface and enters interface configuration
mode. You must configure HDLC and PPP over MPLS on
router interfaces only. You cannot configure HDLC over MPLS
on subinterfaces.
Step 2
Router(config-if)# encapsulation
encapsulation-type
Specifies HDLC or PPP encapsulation and enters connect
submode.
encapsulation-type can be HDLC or PPP.
Step 3
Router(config-fr-pw-switching)# xconnect
peer-router-id vcid encapsulation mpls
Creates the VC to transport the Layer 2 packets.