Cisco 10000-2P2-2DC Software Guide - Page 434
Configuring HDLC and PPP over MPLS, Restrictions for HDLC over MPLS
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Configuration Tasks for L2VPN Chapter 20 Configuring L2 Virtual Private Networks 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: Step 1 Command Router(config)# interface serial slot/port Step 2 Router(config-if)# encapsulation encapsulation-type Step 3 Router(config-fr-pw-switching)# xconnect peer-router-id vcid encapsulation mpls Purpose 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. Specifies HDLC or PPP encapsulation and enters connect submode. encapsulation-type can be HDLC or PPP. Creates the VC to transport the Layer 2 packets. 20-36 Cisco 10000 Series Router Software Configuration Guide OL-2226-23
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