05-07-2008 09:37 AM - edited 03-03-2019 09:51 PM
Hello,
I have a site where once ISDN comes up, OSPF stops sending hellos and the adjacency stays up after ISDN drops. Looking into this I read about ospf demand circuit.
I verified this by running 'show ip ospf interface dialer' and saw the line "Run as demand circuit'.
Neither ISDN site has the command in it's running config, yet all the examples I find show it must be explicitly configured.
Is this the default behavior of OSPF over ISDN now? If so, when did it become default?
Thanks,
Bryan
05-07-2008 11:51 AM
Bryan
It has been a while since I dealt with OSPF demand circuit. It certainly did not used to be a default behavior and I would be very surprised if the default had changed. I believe that somewhere in one of the configs there is something that is setting the interface as demand circuit.
Would it be possible to post the router configs?
HTH
Rick
05-07-2008 12:22 PM
Thanks Rick. Here are the dialer spoke and hub configs. They are quite lengthy so I just have isdn related info:
DIAL SPOKE
----------
interface BRI0/2/0
no ip address
encapsulation ppp
no ip route-cache cef
no ip mroute-cache
dialer rotary-group 1
dialer-group 1
isdn switch-type basic-ni
isdn point-to-point-setup
isdn spid1 11111111111111 1111111
isdn spid2 22222222222222 2222222
no cdp enable
!
interface Dialer1
ip address x.x.x.x 255.255.255.0
encapsulation ppp
no ip route-cache cef
no ip mroute-cache
ip ospf network point-to-multipoint
ip ospf cost 16600
dialer in-band
dialer idle-timeout 130
dialer enable-timeout 6
dialer map ip x.x.x.x name HUB broadcast 1xxxxxxxxxx
dialer load-threshold 5 either
dialer watch-disable 15
dialer watch-group 8
dialer-group 1
no peer neighbor-route
no cdp enable
ppp authentication chap
ppp multilink
!
router ospf 64
log-adjacency-changes
network x.x.x.x 0.0.0.255 area 0
network x.x.x.x 0.0.0.0 area 0
!
dialer watch-list 8 ip
dialer watch-list 8 delay route-check initial 60
dialer watch-list 8 delay disconnect 15
dialer-list 1 protocol ip list 101
SPOKE#show ip ospf int dialer1 | inc Run
Run as demand circuit.
DIAL HUB
--------
interface Serial1/0:23
no ip address
encapsulation ppp
no ip route-cache cef
dialer rotary-group 0
dialer-group 1
isdn switch-type primary-5ess
no cdp enable
!
interface Serial1/1:23
no ip address
encapsulation ppp
no ip route-cache cef
dialer rotary-group 0
dialer-group 1
isdn switch-type primary-5ess
no cdp enable
!
interface Dialer0
ip address x.x.x.x 255.255.255.0
encapsulation ppp
no ip route-cache cef
no ip mroute-cache
ip ospf network point-to-multipoint
ip ospf cost 16600
dialer in-band
dialer idle-timeout 130
dialer enable-timeout 6
dialer map ip x.x.x.x name xxxxxxxxxx broadcast
dialer map ip x.x.x.x name xxxxxxxxxx broadcast
dialer load-threshold 10 either
dialer-group 1
no peer neighbor-route
no cdp enable
ppp authentication chap
ppp multilink
!
router ospf 64
log-adjacency-changes
redistribute bgp 65500 subnets
network x.x.x.x 0.0.0.255 area 0
!
router bgp 65500
redistribute ospf 64 match internal external 1 external 2
no auto-summary
dialer-list 1 protocol ip permit
05-07-2008 12:24 PM
I just checked with one of the OSPF coders, and it's not "supposed" to be. If the config shows otherwise, I can go poke at the code to make certain this is correct--I'm on the road this week, so I can't poke at it right this second.
:-)
Russ
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: