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3.
4.
Step 2: Is the router communicating with the ISDN
network at the LAPD level?
Once the router has established a signalling connection with the network, it starts sending
LAPD packets. LAPD (Link Access Protocol - D channel) is a protocol whereby the router
establishes a logical connection with the ISDN switch. It is via this protocol that the router
informs the switch of its presence, and the switch allocates the router a connection ID. An
LAPD connection has to be established before the router can make or receive ISDN calls.
To see if an LAPD connection has been established, use the command:
where n is the number of the BRI interface under consideration. Interfaces are numbered
from 0.
The output of this command will be as shown in the following figure.
Interfaces:
ISDN
--------------------------------------------
BRI0
--------------------------------------------
SAPs:
ISDN
--------------------------------------------------------------------
BRI0
--------------------------------------------------------------------
DLCs:
ISDN
--------------------------------------------------------------------
BRI0
--------------------------------------------------------------------
The most important item to look at in this output table is the very last line. If an LAPD
connection has been established, then the entry in the State column in this line will be ALIVE.
If the connection has not been established, the state will be DEAD.
If the LAPD is alive, then the problem lies at a higher layer. Go to
connecting successfully?" on page
4
The cable connecting the router to the ISDN network or NTI is faulty.
Try a different cable.
There is a fault in the ISDN network or the NT1.
If options 1, 2 and 3 do not show any faults on the router, then contact your ISDN network
provider and see if they can find the fault on their network.
show lapd=n
Type
TEI Mode
TE
automatic
SAPI
T200
063
000010 000010 000020 000100 000003 000260 000003 001
000
000010 000010 000020 000100 000003 000260 000003 001
SAPI
CES
TEI
063
000
127
000
000
127
001
064
Debug
TEI
off
064
T201
T202
T203
State
V(S)
V(A) rxN(S)
bcast
-
bcast
-
ALIVE
0000
0000
5.
N200
N201
V(R) rxN(R)
-
-
-
-
-
-
0000
0000
"Step 3: Are ISDN calls
N202
k
-
-
0000