Basic question on ppp multilink over ISDN

From: Javier Tomé (fjtm@tid.es)
Date: Fri Oct 07 2005 - 15:28:16 GMT-3


Hi all,

R1 -- ISDN(BRI0/0) -- R2

I am trying to configure ppp multilink on legacy ISDN bringing up both
B-channels from the beginning. This are my configs...

On R1...

interface BRI0/0
 ip address 142.1.45.4 255.255.255.0
 encapsulation ppp
 dialer order round-robin
 dialer map ip 142.1.45.5 name R2 broadcast 5552026
 dialer map ip 142.1.45.5 name R2 broadcast 5552027
 dialer-group 1
 isdn switch-type basic-dms100
 isdn spid1 21255520240101 5552024
 isdn spid2 21255520250101 5552025
 ppp authentication chap
 ppp multilink
 ppp multilink links minimum 2
end

On R2...

interface BRI0/0
 ip address 142.1.45.5 255.255.255.0
 encapsulation ppp
 dialer idle-timeout 0
 dialer map ip 142.1.45.4 name R1 broadcast 5552024
 dialer map ip 142.1.45.4 name R1 broadcast 5552025
 isdn switch-type basic-dms100
 isdn spid1 21255520260101 5552026
 isdn spid2 21255520270101 5552027
 ppp authentication chap
 ppp multilink
end

For some reason (may the ISDN simulator or the switch-type or something
else...) the only way I get this work is by defining both isdn spids and
configuring both isdn map statements. I also need to include the "dialer
order round-robin" to aboid R1 keep trying to call using always the
first dialer map command.

My question is the following:

Why are both dialer map statements required to make this work?. And what
about both ISDN spids? My ISDN simulator is configured to require spids,
but does this make both spids to be required?...

Thank you in advance

Javi



This archive was generated by hypermail 2.1.4 : Sun Nov 06 2005 - 22:00:49 GMT-3