Cisco router PPP Back-to-Back Connection

Hardware and Software Versions

This configuration is applicable to all Cisco IOS software versions.

DCE edge is connected by Wan DCE cable.

DTE edge is connected by Wan DTE cable.

For more information about the wan dce/DTE cable, see the serial cable documentation.

Network Diagram

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This article is based on the following Configuration:

In this configuration, Prasit serves as DCE and Spicey as DTE.

Configuration

Prasit

Interface Serial0 Ip address 5.0.2.1 255.255.255.0 Encapsulation ppp Clockrate 64000 No cdp enable

Spicey

Interface Serial1 Ip address 5.0.2.2 255.255.255.0 Encapsulation ppp No cdp enable

R1 # show cdp nei

Capability Codes: R-Router, T-Trans Bridge, B-Source Route Bridge

S-Switch, H-Host, I-IGMP, r-Repeater

Device IDLocal IntrfceHoldtmeCapabilityPlatformPort ID

//No neighbors found.

R1 # ping 5.0.2.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 5.0.2.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 44/76/124 MS

R1 #

* May 28 23:24:36. 487: IP: tableid = 0, s = 5.0.2.1 (local), d = 5.0.2.2 (Serial/1), routed via FIB

* May 28 23:24:36. 487: IP: s = 5.0.2.1 (local), d = 5.0.2.2 (Serial/1), len 100, sending

* May 28 23:24:36. 535: IP: tableid = 0, s = 5.0.2.2 (Serial/1), d = 5.0.2.1 (Serial/1), routed via RIB

* May 28 23:24:36. 539: IP: s = 5.0.2.2 (Serial/1), d = 5.0.2.1 (Serial/1), len 100, rcvd 3

* May 28 23:24:36. 543: IP: tableid = 0, s = 5.0.2.1 (local), d = 5.0.2.2 (Serial/1), routed via FIB

* May 28 23:24:36. 543: IP: s = 5.0.2.1 (local), d = 5.0.2.2 (Serial/1), len 100, sending

* May 28 23:24:36. 639: IP: tableid = 0, s = 5.0.2.2 (Serial/1), d = 5.0.2.1 (Serial/1), routed via RIB

* May 28 23:24:36. 643: IP: s = 5.0.2.2 (Serial/1), d = 5.0.2.1 (Serial/1), len 100, rcvd 3

* May 28 23:24:36. 647: IP: tableid = 0, s = 5.0.2.1 (local), d = 5.0.2.2 (Serial/1), routed via FIB

* May 28 23:24:36. 647: IP: s = 5.0.2.1 (local), d = 5.0.2.2 (Serial/1), len 100, sending

* May 28 23:24:36. 763: IP: tableid = 0, s = 5.0.2.2 (serial'/1), d = 5.0.2.1 (serial'

R1 #/1), routed via RIB

* May 28 23:24:36. 767: IP: s = 5.0.2.2 (Serial/1), d = 5.0.2.1 (Serial/1), len 100, rcvd 3

* May 28 23:24:36. 771: IP: tableid = 0, s = 5.0.2.1 (local), d = 5.0.2.2 (Serial/1), routed via FIB

* May 28 23:24:36. 771: IP: s = 5.0.2.1 (local), d = 5.0.2.2 (Serial/1), len 100, sending

* May 28 23:24:36. 831: IP: tableid = 0, s = 5.0.2.2 (Serial/1), d = 5.0.2.1 (Serial/1), routed via RIB

* May 28 23:24:36. 835: IP: s = 5.0.2.2 (Serial/1), d = 5.0.2.1 (Serial/1), len 100, rcvd 3

* May 28 23:24:36. 835: IP: tableid = 0, s = 5.0.2.1 (local), d = 5.0.2.2 (Serial/1), routed via FIB

* May 28 23:24:36. 839: IP: s = 5.0.2.1 (local), d = 5.0.2.2 (Serial/1), len 100, sending

* May 28 23:24:36. 875: IP: tableid = 0, s = 5.0.2.2 (Serial/1), d = 5.0.2.1 (Serial/1), routed via RIB

* May 28 23:24:36. 879: IP: s = 5.0.2.2 (Serial/1), d = 5.0.2.1 (Serial/1), len 100, rcvd 3

//No physical neighbors are found to be accessible..