EXPERT Question: Local BRI is not ping-able?

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I have 3 routers with an ISDN BRI (801,2503,2523) all with different
versions of IOS (v12+)
but with none i can ping my local BRI itself despite i can always ping to
the "other side"


for example

hostname router1
interface bri 0
ip address 1.0.0.1 255.255.255.0
dialer map ip 1.0.0.2 (phonenumber_router2)
....


hostname router2
interface bri 0
ip address 1.0.0.2 255.255.255.0
dialer map ip 1.0.0.1 (phonenumber_router2)
....


router1#ping 1.0.0.2    (to the other router)
-->>bring up link .....
-->> 5/5 succes

router1#ping 1.0.01   (to the local interface)
-->>bring up link ....
-->> 0/5 succes

and same happens at the CLI of the other side ...
it doenst matter what kind of DDR i use, i seem not to be able to ping my
BRI localy, even if i use other router combinations.
so this looks like a "normal" behavior.

can some expert explain me why please?



Re: EXPERT Question: Local BRI is not ping-able?


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That is actually normal behaviour since BRI is multipoint interface. So,
to ping your own IP, you have to map it using 'dialer map' too.


--
-Ivan.

*** Use Rot13 to see my eMail address ***

Re: EXPERT Question: Local BRI is not ping-able?


Partly solved:

Thanks a lot Ivan, multipoint interface was the keyword here.
My first searchresults on the cisco site did not resolve to anything usefull
at first, but the word "multipoint" did it :-)
The most intresting i found on the cisco site for now was this:
---start copy of
source:http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Care
er%20Certifications&topic=Training&CommCmd=MB%3Fcmd%3Dpass_through%26locatio
n%3Doutline%40%5E1%40%40.ee8a9ca/3#selected_message
kirkster - Network Consultant, SC Communications, CCIE

Mar 29, 2003, 3:53am PST
That's right.
You cannot, by default, ping the routers own interface on:
frame-relay physical interfaces
frame-relay multipoint interfaces
ISDN interfaces
ATM physical interfaces
ATM multipoint interfaces

In order to be able to ping your own interface you need to create a map
statement on that interface, mapping that interface's own IP address to a
PVC used by something else.
EG
ip address 123.123.123.254
frame-relay map ip 123.123.123.1 234 broadcast
! now put a map to our own interface without broadcast keyword
frame relay map ip 123.123.123.254 234

On ISDN
!
ip address 10.0.0.1 255.255.255.0
dialer map ip 10.0.0.2 name cisco 555111111 broadcast
dialer map ip 10.0.0.1 555111111
This will bring the ISDN link up when you ping own interface.

On ATM
int atm2/0
ip address 10.1.1.1 255.255.255.0
pvc 0/222
protocol ip 10.1.1.2 broadcast
protocol ip 10.1.1.1
!
Steve
CCIE #11330
--- end copy

I've tested your solution and it works PERFECTLY :-) while the link is down,
the int can't be pinged; but it activates the dialer, ... and is ping-able
then
So this is very consistent behaviour for me then :-) thanks a lot for your
help.

Now i still need to find out how it can be done with DDR Dialer Profiles for
ISDN
The problem is that dialer maps and profiles can't be combined on the
interface level (very logical) but even not on dialer level too


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Re: EXPERT Question: Local BRI is not ping-able?



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I think you have partly answered your own question. By definition a
dialer profile is a point to point connection and not a multipoint
connection. Normally you use the command

dialer string (phonenumber_router2)

since you are only connecting to 1 remote router and not many in the
multipoint case you do not need map statements for L3 to L2
resolution. Enter the dial string under the dialer interface and try
pinging your own interface. It should work!!!

Beez
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Re: EXPERT Question: Local BRI is not ping-able?


CORRECT

Tested and it works as you said Beez
So my problem is completely solved now :-)
Thanks a lot for the help guys, i learned from it

I'll be back with harder questions one day ;-) (all questions look hard in
the beginning until you know the solution ofcourse)
Keep up the spirit guys !!


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for
ping
So,



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