From: Donny MATEO (donny.mateo@sg.ca-indosuez.com)
Date: Tue Nov 19 2002 - 03:02:45 GMT-3
the problem with 2 backup interface is when say rtr1 serial interface is down, rtr1 will enable the
BRI and call the rtr2. A problem will occured if on router 2, the serial interface is indicated as
up (as is the norm with frame-relay). Router 2 will force the BRI to be on standby state then it
would not be able to be used to accept the call from rtr1.
for the disconecting after 120sec, did you specify OSPF as interesting traffic under your
access-list for the dialer-list on both routers ?
Donny
"Nancy Courtney
\(ncourtne\)" To: "ccie" <ccielab@groupstudy.com>
<ncourtne@cisco.c cc:
om> Subject: Solie lab 16-pg 536--backup interface using ISDN
Sent by:
nobody@groupstudy
.com
19-11-2002 12:13
Please respond to
"Nancy Courtney
\(ncourtne\)"
Good Evening,
I am having issues working this lab where item 5 states "both routers
must be capable of initiating ISDN calls" . Solie's solution places the
backup interface cmd on both routers' serial interface. On my lab, this
brings both sides into a standby state and neither will call the other.
When removing the backup interface cmd off one router, backup works well
except the B channels start to disconnect on the called router after the
120 second timeout.
Is Solie incorrect on this config? If not, can someone tell me what I
am doing wrong?
Below is the config where R1 will call R2; however, R2 disconnects the
call after 120 seconds:
R1-Greenbay
interface BRI0
ip address 170.20.20.1 255.255.255.252
encapsulation ppp
dialer map ip 170.20.2.2 name R2-SanDiego broadcast 6785556789
dialer map ip 170.20.2.2 name R2-SanDiego broadcast 6785559876
dialer load-threshold 1 either
dialer-group 1
isdn switch-type basic-ni
isdn spid1 67855512341101
isdn spid2 67855543211102
ppp authentication pap
ppp pap sent-username R1-Greenbay password 7 14141B180F0B
ppp multilink
end
!
interface Serial0
backup delay 10 120
backup interface BRI0
backup load 50 25
ip address 170.10.251.9 255.255.255.252
encapsulation frame-relay
ip ospf network point-to-point
no fair-queue
frame-relay interface-dlci 102
end
R2-SanDiego
interface BRI0
ip address 170.20.20.2 255.255.255.252
encapsulation ppp
dialer map ip 170.20.20.1 name R1-Greenbay broadcast 6785551234
dialer map ip 170.20.20.1 name R1-Greenbay broadcast 6785554321
dialer load-threshold 1 either
dialer-group 1
isdn switch-type basic-ni
isdn spid1 67855567891101
isdn spid2 67855598761102
ppp authentication pap
ppp pap sent-username R2-SanDiego password 7 14141B180F0B
ppp multilink
end
!
interface Serial0
ip address 170.10.251.10 255.255.255.252
encapsulation frame-relay
ip ospf network point-to-point
no fair-queue
frame-relay interface-dlci 101
end
thanks
Nancy
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