From: simon hart (simon.hart@btinternet.com)
Date: Fri Mar 11 2005 - 14:02:28 GMT-3
Hi all,
I am having a bit of a nightmare with some simple ISDN configuration: I am
trying to establish a connection between two routers R4 and R5. R5 should
not be able to initiate a call - only R4. I am using legacy DDR, configs
below
Frame_R4#
!
interface BRI0
ip address 187.1.45.4 255.255.255.0
encapsulation ppp
dialer map ip 187.1.45.5 name Rack1R5 broadcast 2222
dialer-group 1
isdn switch-type basic-ni
isdn spid1 1211
end
!
dialer-list 1 protocol ip permit
Rack1R5#
!
interface BRI0/0
ip address 187.1.45.5 255.255.255.0
encapsulation ppp
dialer idle-timeout 0
dialer map ip 187.1.45.4 name Rack1R5 broadcast
isdn switch-type basic-ni
isdn spid1 2122
end
If I ping from Frame_R4 then the ISDN line is brought up but no response to
the pings. If I debug IP packet on R5 I notice that I have an encapsulation
failure:
Rack1R5#
*Mar 1 07:52:46.460: IP: s=187.1.45.4 (BRI0/0), d=187.1.45.5 (BRI0/0), len
100, rcvd 3
*Mar 1 07:52:46.460: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
100, sending
*Mar 1 07:52:46.460: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
100, encapsulation failed
Rack1R5#
*Mar 1 07:52:48.459: IP: s=187.1.45.4 (BRI0/0), d=187.1.45.5 (BRI0/0), len
100, rcvd 3
*Mar 1 07:52:48.459: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
100, sending
*Mar 1 07:52:48.463: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
100, encapsulation failed
As you can see it is showing an encapsulation failure, however the map looks
fine and the config is exactly as dictated within the solution guide of the
Internetwork expert solution guide
Any comments most welcome
S.
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