Information Technology Reference
In-Depth Information
Example16-2 Montecito pings Goleta
S: ipcp: config ACK received, type = 3 (CI_ADDRESS), Address =
172.16.20.1
T: BRI0: install route to 172.16.20.2
U: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0: B-Channel 1,
changed state to up
A
—Traffic is generated in order to initiate a dial attempt.
B
—The connection is established (ISDN debugs are not used in this example).
Begin LCP:
C
—Montecito sends LCP configuration requests for AUTHTYPE and for MAGICNUMBER.
D
— Goleta sends its CONFREQs. If the value for MAGICNUMBER is the same as the value sent
by Montecito, there is a strong probability that the line is looped.
E
—This indicates that Montecito has sent acknowledgments to Goleta's CONFREQs.
F
—Montecito receives CONFACKs from Goleta.
Begin authentication phase:
G, H
—Montecito and Goleta challenge each other for authentication.
J
— Goleta responds to the challenge.
K, L
— Goleta successfully passes authentication.
M
— Goleta sends a message to Montecito, saying that authentication was successful.
NCP negotiation begins:
N, P
—Each router sends its configured IP address in a CONFREQ.
Q, R
—Montecito sends a CONFACK to Goleta's CONFREQ . . .
S
— . . . and vice versa.
T, U
—A route is installed from Montecito to Goleta, and the protocol on the interface changes to
“up,” indicating that the NCP negotiations have completed successfully.
Before Calling Cisco Systems's TAC Team
Before calling Cisco Systems's Technical Assistance Center (TAC), make sure that you have read
through this chapter and completed the actions suggested for your system's problem.
Additionally, do the following and document the results so that we can better assist you:
For all problems, collect the output of
show running-config
and
show version
. Ensure that the
command
service timestamps debug datetime msec
is in the configuration.
For DDR problems, collect the following:
•
show dialer map
•
debug dialer
•
debug ppp negotiation
•
debug ppp authentication
If ISDN is involved, collect the following:
