Topic requirements and topology diagram
My topology diagram
Perform pap authentication for r1 and r5
[The above ppp authentication-mode pap should be deleted]
Then realize mutual authentication
At this time, you need to manually turn off the s 4/0/0 interface of R1 and then turn it on for the authentication to take effect.
The authentication is valid
for the CHAP authentication of r2 and r5.
Similarly, the s 4/0/0 interface of R2 must be manually turned off and on again to make the authentication take effect . The MGRE environment
of the HDLC encapsulation
r1/2/3 of r3 and r5 must
be built first. Interoperability, point to r5 by default for 1/2/3/4,
turn on RIP,
turn off split horizon
point-to-point r1 and r4, GRE
normal access to r5 loopback
End of experiment