All models include a basic software and configuration in PROM, plus the current software and configuration in Flash Memory.
The PPP implimentation is mutli link capable. The available bandwidth on a circuit may be dynamicaly varied by adding or subtracting ISDN chanels as requierments vary.
Compresion may be at the link layer, or in the form of IP payload compresion. Which allows compresion of suitable packets be for encapsulation and encription. This is performed in an optional hardware modual.
Please note the usefullness of these depend on the unit, having sufficent processing power, and memory to handle the task. So do not use on AR-1xx, and AR2xx units.
The variouse feature licences are interdependent, so cirtain features include others.
Includes dynamic proxies for :-
Also include SSH and its associated encription licences.
Switch on router, Diagnostics mesages should be displayed as unit boots. Note There is a prompt to stop loading of software/configs from Flash, If you have realy messed it up.
There are also a number Technical notes availabe from AlliedTelesyn see the Technotes Index
show debug
Points to bear in mind are :-
ISDN interfaces are automaticaly created for each hardware interface detected. ISDN-2 interfaces will be identified as "bri" and a number.
show bri=0 state
Should return ACTIVATED if carrier is being received from the exchange
on the first ISDN-2 interface on the router.
reset bri=0
Gives the interface a prod to wake it up.
show lapd
This displays the status of the control layer negociated with the exchange.
Look for ALIVE or DEAD if lapd is dead but the interface is
active the exchange has lost sync posible due to line noise the following will
give it a nudge.
reset q931=0
show isdn log
This displays a list of recent call attempts and there outcome.
For more detail see the
ISDN trouble shooting guide
To fix
Wait a few seconds
You should have incrementing counters for both Transmit and receive.
If you do not you have found a problem.
If TX is zero either your router or cable is faulty, or the NTU is not providing clock signals.
If TX >0 but RX stuck at zero. you are not recieving data from remote router.
Try using loop back facilities do locate fault.
If counters look ok and IP interfaces and routes have been set.
You should be able to ping or tracert from a local PC to remote site.
If this does not work try looking at :-
You should now be able to telnet to the remote router.
Cisco RAS servers
Cisco RAS servers do not suport LQR {Link Quality Reporting}
This results in the line droping after exactly 2 minutes.
show ppp
Note the number for the problematic connection
set ppp=0 over=isdn-MyISP lqr=off echo=on
Leased line testing
Start by checking the interfaces in use
show syn
reset syn=0 counter
show sysn=0 counter
show syn=0 counter
show ppp=0
show ip route
ISDN access to a remote router
This Example will work to a remote router running in switch 2 mode 1.8 software.
It will also work if the router has been programed to accept calls.
add isdn call=remote dir=out prec=out num=555100
create ppp=11 over isdn-remote idle=300
enable ip
add ip int=ppp11 ip=192.168.42.1
add ip route=192.168.44.0 mask=255.255.255.0 next=192.168.42.2 int=ppp11
telnet 192.168.42.2