From: jfaure@sztele.com
Date: Sat Feb 01 2003 - 07:44:28 GMT-3
Hi Guys!
We are testing OSPF ON DEMAND features in my lab. I'm using it over an ISDN
link with the purpose of backing up the main serial link (it's running
ospf) if it becomes unavailable. Apparently, it's working fine, but i'm
seeing that every 12 hours or so, the on demand circuit brings up after a
message like this:
%OSPF-5-ADJCHG: Process 1, Nbr 133.1.46.1 on BRI1/0 from FULL to DOWN, Nei
ghbor Down: Too many retransmitions on Demand Circuit
This happens when the ospf adjacency beetween the two sides of the isdn
link goes down (you know ospf on demand suppress hellos and ospf lsa's in a
link type "point-to-point" as i have, then the adjacency must keep alive).
Then, why this adjacency goes down?
There is no topollogical change in the ospf network other than this (the
ospf adjacency trough the isdn link goes down). The error i said is
reported by the end that receives the isdn call (this end musn't call, and
the ond demand feature and dialer maps are configured in the other link)
Anybody knows what this error means in a ospf on demand environment? Am I
missing something about this?
Here you are the configs of the two routers:
R3---------main Frame Relay link------R5
|---------------backup isdn link--------------|
R5 (the router that must call if the main link goes down)
username R3 password 0 CISCO
ip subnet-zero
no ip domain-lookup
isdn switch-type basic-net3
interface Loopback0
ip address 133.1.5.5 255.255.255.255
!
interface BRI0/0
description enlace backup
ip address 133.1.35.5 255.255.255.0
encapsulation ppp
ip ospf demand-circuit
dialer map ip 133.1.35.6 name R3 broadcast 7200
dialer load-threshold 128 either
dialer-group 1
isdn switch-type basic-net3
no peer neighbor-route
ppp authentication chap callin
interface Serial1/1
no ip address
encapsulation frame-relay
no arp frame-relay
no frame-relay inverse-arp
interface Serial1/1.2 multipoint
description ENLACE R2 Y R3
ip address 133.1.46.1 255.255.255.0
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 6 CISCO
ip ospf network point-to-multipoint
ip ospf hello-interval 50
ip ospf priority 255
no arp frame-relay
frame-relay map ip 133.1.46.1 502 broadcast
frame-relay map ip 133.1.46.2 502 broadcast
frame-relay map ip 133.1.46.3 503 broadcast
no frame-relay inverse-arp
router ospf 1
router-id 133.1.46.1
log-adjacency-changes
area 5 virtual-link 133.1.56.6
redistribute rip subnets tag 30
network 133.1.5.5 0.0.0.0 area 0
network 133.1.35.0 0.0.0.255 area 3
network 133.1.46.0 0.0.0.255 area 0
network 133.1.56.0 0.0.0.255 area 5
access-list 101 permit ospf any any
access-list 101 deny ip any host 255.255.255.255
access-list 101 deny ip host 133.1.5.5 any
access-list 101 permit ip any any
dialer-list 1 protocol ip list 101
Related config of R3
username R5 password 0 CISCO
ip subnet-zero
no ip domain-lookup
!
isdn switch-type basic-net3
interface Loopback0
ip address 133.1.3.3 255.255.255.255
interface Serial0/0
description AREA 0
ip address 133.1.46.3 255.255.255.0
encapsulation frame-relay
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 6 CISCO
ip ospf network point-to-multipoint
ip ospf hello-interval 50
ip ospf priority 0
no fair-queue
no arp frame-relay
frame-relay map ip 133.1.46.1 305 broadcast
frame-relay map ip 133.1.46.2 305 broadcast
frame-relay map ip 133.1.46.3 305 broadcast
no frame-relay inverse-arp
interface BRI1/0
ip address 133.1.35.6 255.255.255.0
encapsulation ppp
dialer idle-timeout 0
dialer-group 1
isdn switch-type basic-net3
no peer neighbor-route
ppp authentication chap
router ospf 1
router-id 133.1.46.3
log-adjacency-changes
redistribute eigrp 2 subnets tag 25 route-map onlysum
network 133.1.3.3 0.0.0.0 area 0
network 133.1.23.0 0.0.0.255 area 3
network 133.1.35.0 0.0.0.255 area 3
network 133.1.46.0 0.0.0.255 area 0
I don't include all the config of the 2 routers, only the related to this
issue.
Any help would be apreciated. Regards
Juan Faure Ferrer
email: jfaure@sztele.com
Lmnea de Negocio de Telematica y CC
Ingeniero de Integracisn de Redes y Sistemas
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