Verifying PPP Encapsulation
Now that PPP encapsulation is enabled, I’ll show you how to verify that it’s up and running
(see Table 11.4) connected with either a point-to-point serial or ISDN connection.
FIGURE 1 1 . 3 PPP authentication example
TABLE 1 1 . 4 Verifying PPP
Command Meaning
show interface interface Verifies the interface configuration and encapsulation set on
each interface
debug ppp authentication Displays the CHAP authentication process as it occurs between
two routers in the network
show cdp neighbors detail Displays a detailed output of all directly connected Cisco
devices, which includes the IP addresses of each device and
their hostname
You can start verifying the configuration with the show interface command:
Pod1R1#sh int s0/0
Serial0/0 is up, line protocol is up
Hardware is PowerQUICC Serial
Internet address is 10.0.1.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 239/255, txload 1/255, rxload 1/255
Encapsulation PPP
loopback not set
Keepalive set (10 sec)
LCP Open
Open: IPCP, CDPCP
[output cut]
Notice that the sixth line lists encapsulation as PPP and the eighth line shows that the LCP
is open. This means it has negotiated the session establishment and all is good! The ninth line
tells you that NCP is listening for the protocols IP and CDP.
But what will you see if everything isn’t perfect? I’m going to type in the configuration
shown in Figure 11.4 and find out.