If we go right back to the question of 'what problem are you trying to solve' (I
think this has become the official groupstudy motto :-), everything is working
fine except that the dialup link is triggering when it's not supposed to.
So, following the other useful principle of KISS (Keep It Simple, S*****), we
shouldn't need to muck around with the routing protocols themselves. Passive
interfaces and snapshot routing protocols are both (probably) overkill.
How do you specify what brings up the link? A dialer-list statement. The
original post didn't show what dialer-list is configured, and I haven't seen any
posts stating the outcome of a 'dialer debug' or 'show dialer' (show dialer when
the call is up will show what triggered the call), but OSPF updates do sound
like a likely candidate for what is triggering the link.
So, assuming that investigation shows that it really is OSPF that's causing the
ISDN to dial, we want the solution that will cause the least side effects -
don't forget that everything else is working fine now.
Making a passive interface or introducing snapshot routing will stop (or at
least change) routing across the dialup link, which could cause other problems.
But if the dialer-list statement excludes OSPF, it won't stop OSPF across the
link, it'll just stop it triggering dialup.
Something like the following should help. It may need changes depending on what
the existing dialer-list is.
access-list 101 deny ospf any any
access-list 101 permit ip any any
dialer-list 1 protocol ip list 101
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 20/07/2000 08:49
---------------------------
"Ruslan S Tchinyakov" <[EMAIL PROTECTED]> on 19/07/2000 19:12:04
Please respond to "Ruslan S Tchinyakov" <[EMAIL PROTECTED]>
To: "'McCallum, Robert'" <[EMAIL PROTECTED]>
"'Ruslan S Tchinyakov'" <[EMAIL PROTECTED]>
"'Olden Pieterse'" <[EMAIL PROTECTED]>
"'Evan You'" <[EMAIL PROTECTED]>
cc: [EMAIL PROTECTED] (bcc: JENNY MCLEOD/NSO/CSDA)
Subject: RE: OSPF On Demand Circuit
Shapshot Routing is for DV protocols only!!
It breaks OSPF and others LS protocols.
Ruslan Tchinyakov,
CCNP+Security, CCDP, MCSE
-----Original Message-----
From: McCallum, Robert [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, July 19, 2000 12:47 PM
To: 'Ruslan S Tchinyakov'; 'Olden Pieterse'; 'Evan You'
Cc: [EMAIL PROTECTED]
Subject: RE: OSPF On Demand Circuit
Also if you make your interface a passive interface then you will NOT pass
routing updates across the link. What you should do is Snapshot Routing.
Put in a static route across this line and give it a higher admin distance
i.e. 180. Then when the primary link fails the static route will takeover
and your backup timers will bring up the link.
-----Original Message-----
From: Ruslan S Tchinyakov [mailto:[EMAIL PROTECTED]]
Sent: 19 July 2000 09:00
To: 'Olden Pieterse'; 'Evan You'
Cc: [EMAIL PROTECTED]
Subject: RE: OSPF On Demand Circuit
In OSPF unlike DV protocols (including EIGRP) the router should have
COMPLETE vision of the network. So distribute-lists and passive interfaces
can breake all routing at once.
Regards, Ruslan Tchinyakov,
CCNP, CCDP,MCSE
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Olden
Pieterse
Sent: Tuesday, July 18, 2000 7:55 PM
To: 'Evan You'
Cc: '[EMAIL PROTECTED]'
Subject: RE: OSPF On Demand Circuit
Hi there
My 2 cents ...
Try and put passive interface on your bri0 so it doesnt send out routing
updates .
Some updates (routing ???) is bringing up that line .
Hope it helps
Cheers
Olden
-----Original Message-----
From: Evan You [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 18, 2000 5:33 PM
To: [EMAIL PROTECTED]
Subject: OSPF On Demand Circuit
Hey all,
I have two routers in OSPF Area 0 that have ISDN backup connections from one
to the other.
The ISDN config is working great. When the primary FR link goes down, the
ISDN kicks in instantly and it dies when the primary link goes back up. My
dilemma is that even though the primary FR link is up, the ISDN link goes up
every few minutes.
I've configured EIGRP DDR scenarios and had to use Access-list to control
EIGRP traffic over the BRI interface. Is it the same with OSPF? What can be
causing the ISDN BRI to go up every few minutes?
The routers are currently running:
OSPF
IP
Frame Relay
And nothing else!
interface BRI0
ip address 212.1.22.34 255.255.255.240
encapsulation ppp
ip ospf cost 200
ip ospf demand-circuit
bandwidth 64000
isdn spid1 xxxxxxxxx xxxxx
dialer idle-timeout 180
dialer map ip 212.1.22.33 name R2 broadcast xxxxxxx
dialer hold-queue 75
dialer-group 1
no cdp enable
ppp authentication chap
Thanks,
Evan You - CCNA
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