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1. Multilink Ppp

Configuring Serial Interfaces on the Cisco ASR 9000 Series Router

When LCP is running on the peer and receives an ECHOREQ packet, it responds with an echo reply

(ECHOREP) packet, regardless of whether keepalives are enabled on the peer.

Keepalives are independent between the two peers. One peer end can have keepalives enabled; the other

end can have them disabled. Even if keepalives are disabled locally, LCP still responds with ECHOREP

packets to the ECHOREQ packets it receives. Similarly, LCP also works if the period of keepalives at

each end is different.

Use the debug chdlc slarp packet command and other Cisco HDLC debug commands to display

Note

information about the Serial Line Address Resolution Protocol (SLARP) packets that are sent to the peer

after the keepalive timer has been configured.

Frame Relay Encapsulation

When Frame Relay encapsulation is enabled on a serial interface, the interface configuration is

hierarchical and comprises the following elements:

The administrative state of a parent interface drives the state of the subinterface and its PVC. When the

Note

administrative state of a parent interface or subinterface changes, so does the administrative state of any

child PVC configured under that parent interface or subinterface.

To configure Frame Relay encapsulation on serial interfaces, use the encapsulation frame-relay

command.

Frame Relay interfaces support two types of encapsulated frames:

•

Use the encap command in PVC configuration mode to configure Cisco or IETF encapsulation on a

PVC. If the encapsulation type is not configured explicitly for a PVC, then that PVC inherits the

encapsulation type from the main serial interface.

Note

Cisco encapsulation is required on serial main interfaces that are configured for MPLS. IETF

encapsulation is not supported for MPLS.

OL-26061-03

The serial main interface comprises the physical interface and port. If you are not using the serial

interface to support Cisco HDLC and PPP encapsulated connections, then you must configure

subinterfaces with permanent virtual circuits (PVCs) under the serial main interface. Frame Relay

connections are supported on PVCs only.

Serial subinterfaces are configured under the serial main interface. A serial subinterface does not

actively carry traffic until you configure a PVC under the serial subinterface. Layer 3 configuration

typically takes place on the subinterface.

Point-to-point PVCs are configured under a serial subinterface. You cannot configure a PVC directly

under a main interface. A single point-to-point PVC is allowed per subinterface. PVCs use a

predefined circuit path and fail if the path is interrupted. PVCs remain active until the circuit is

removed from either configuration. Connections on the serial PVC support Frame Relay

encapsulation only.

Cisco (default)

IETF

Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide

Information About Configuring Serial Interfaces

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