From: Erick B. (erickbe@xxxxxxxxx)
Date: Mon Jul 08 2002 - 23:16:14 GMT-3
Just some more info... when the router first comes up
it is going to form an OSPF adj over the ISDN if ospf
is allowed as interesting traffic. The OSPF demand
options don't come into play until an OSPF adj is
formed and these options are agreed upon by both
routers. Once it's formed with these options it knows
not to send hellos, not age the routes, etc.
After it's formed and idle-timeout expires the DDR
link will go down. If OSPF is interesting, OSPF will
trigger the DDR to come up if theres a LSDB change,
etc.
--- Carlos G Mendioroz <tron@huapi.ba.ar> wrote:
> Danny,
> Short answer: fix the ospf cost of your ddr
> interfaces (via ip ospf
> cost).
>
> If you take a closer look, you should see that
> hellows are supressed for
> the
> DDR interfaces. The link is being set because of an
> LSU triggered by a
> change in
> cost of the link.
>
> HTH
>
> Danny.Wang@alderwoods.com wrote:
> >
> > Very simple scenario. R1 connected to R2 with both
> ISDN and Ethernet.
> >
> > Requiment:
> >
> > 1. Configure OSPF for the network
> > 2. Do not allow OSPF hello to keep the ISDN link
> up indefinitely
> > 3. The ISDN line should only come up when the
> ethernet connections failed
> >
> > But after i enable the 'ip ospf demand circuit' on
> the dialer interface
> > (one side only), the link still constantly up and
> down, just wonderring if
> > i missed something or it's a Teltone simulator
> "bug" ;-j
> >
> > When i enable debuy ip packet and dialer packet,
> it shows the dialer caused
> > by hello packet, source ip address from dialer 1
> to 224.0.0.5 ).
> >
> > when i modified the dialer-list on the R1, it's
> stopped, and leaving R2 as
> > is
> >
> > dialer list 1 protocol list 100
> > access-list 100 deny ospf any any
> > access-list 100 permit ip any any
> >
> > Any advice?
> >
> > R1------ISDN-------R2
> > \ /
> > \ /
> > Ethernet
> >
> > r1# sh run
> >
> > Building configuration...
> >
> > Current configuration : 1551 bytes
> > !
> > version 12.1
> > no service single-slot-reload-enable
> > service timestamps debug uptime
> > service timestamps log uptime
> > no service password-encryption
> > !
> > hostname r1
> > !
> > !
> > username CCIE2 password 0 cisco
> > username r2 password 0 cisco
> > !
> > !
> > !
> > !
> > ip subnet-zero
> > no ip domain-lookup
> > !
> > ip audit notify log
> > ip audit po max-events 100
> > isdn switch-type basic-ni
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > interface Loopback0
> > ip address 10.10.11.1 255.255.255.255
> > !
> > interface Loopback1
> > ip address 10.10.12.1 255.255.255.255
> > !
> > interface Loopback2
> > ip address 10.10.13.1 255.255.255.255
> > !
> > interface Ethernet0/0
> > no ip address
> > shutdown
> > !
> > interface Serial0/0
> > no ip address
> > shutdown
> > no fair-queue
> > !
> > interface BRI0/0
> > no ip address
> > encapsulation ppp
> > dialer pool-member 1
> > isdn switch-type basic-ni
> > isdn spid1 0835866101 8358661
> > isdn spid2 0835866301 8358663
> > ppp authentication chap
> > ppp multilink
> > !
> > interface Ethernet0/1
> > ip address 192.168.1.211 255.255.255.0
> > !
> > interface Dialer1
> > ip address 172.19.1.6 255.255.255.252
> > encapsulation ppp
> > ip ospf demand-circuit
> > dialer pool 1
> > dialer remote-name CCIE2
> > dialer string 8358662
> > dialer-group 1
> > ppp authentication chap
> > ppp chap hostname CCIE1
> > ppp multilink
> >
> > !
> > router ospf 64
> > log-adjacency-changes
> > network 10.10.11.1 0.0.0.0 area 0
> > network 10.10.12.1 0.0.0.0 area 1
> > network 10.10.13.1 0.0.0.0 area 2
> > network 172.19.1.4 0.0.0.3 area 0
> > network 192.168.1.0 0.0.0.255 area 0
> > !
> > ip classless
> > ip http server
> > ip ospf name-lookup
> > !
> > dialer-list 1 protocol ip permit
> > !
> > !
> > alias exec r show run
> > alias exec c conf t
> > !
> > line con 0
> > exec-timeout 0 0
> > line aux 0
> > line vty 0 4
> > login
> > !
> > end
> >
> > r2#sh run
> > Building configuration...
> >
> > Current configuration : 1627 bytes
> > !
> > version 12.1
> > no service single-slot-reload-enable
> > service timestamps debug uptime
> > service timestamps log uptime
> > no service password-encryption
> > !
> > hostname r2
> > !
> > logging buffered 10000 debugging
> > !
> > username CCIE1 password 0 cisco
> > username r1 password 0 cisco
> > !
> > !
> > !
> > !
> > ip subnet-zero
> > no ip domain-lookup
> > !
> > isdn switch-type basic-ni
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > interface Loopback0
> > ip address 10.10.11.2 255.255.255.255
> > !
> > interface Loopback1
> > ip address 10.10.12.2 255.255.255.255
> > !
> > interface Loopback2
> > ip address 10.10.13.2 255.255.255.255
> > !
> > interface Ethernet0/0
> > no ip address
> > shutdown
> > !
> > interface Serial0/0
> > no ip address
> > shutdown
> > no fair-queue
> > !
> > interface BRI0/0
> > no ip address
> > encapsulation ppp
> > dialer pool-member 1
> > isdn switch-type basic-ni
> > isdn spid1 0835866201 8358662
> > isdn spid2 0835866401 8358664
> > ppp authentication chap
> > ppp multilink
> > !
> > interface Ethernet0/1
> > backup delay 2 2
> > backup interface Dialer1
> > ip address 192.168.1.212 255.255.255.0
> > !
> > interface Dialer1
> > ip address 172.19.1.5 255.255.255.252
> > encapsulation ppp
> > dialer pool 1
> > dialer remote-name CCIE1
> > dialer string 8358661
> > dialer load-threshold 128 either
> > dialer-group 1
> > ppp authentication chap
> > ppp chap hostname CCIE2
> > ppp multilink
> > !
> > router ospf 64
> > log-adjacency-changes
> > network 10.10.11.2 0.0.0.0 area 0
> > network 10.10.12.2 0.0.0.0 area 12
> > network 10.10.13.2 0.0.0.0 area 13
> > network 172.19.1.4 0.0.0.3 area 0
> > network 192.168.1.0 0.0.0.255 area 0
> > !
> > ip classless
> > ip http server
> > !
> > dialer-list 1 protocol ip permit
> > !
> > !
> > alias exec r show run
> > alias exec c conf t
> >
> > line con 0
> > exec-timeout 0 0
> > line aux 0
> > line vty 0 4
> > login
> > !
> > end
> >
> > Debug output:
> >
> > 00:44:45: IP: s=192.168.1.211 (local), d=224.0.0.5
> (Ethernet0/1), len 68,
> > sendin
> > g broad/multicast
> > 00:44:49: IP: s=192.168.1.212 (Ethernet0/1),
> d=224.0.0.5, len 68, rcvd 0
> > 00:44:54: IP: s=172.19.1.6 (local), d=224.0.0.5
> (Dialer1), len 64, sending
> > broad
> > /multicast
> > 00:44:54: Di1 DDR: ip (s=172.19.1.6, d=224.0.0.5),
> 64 bytes, outgoing
> > interestin
> > g (ip PERMIT)
> > 00:44:54: IP: s=172.19.1.6 (local), d=224.0.0.5
> (BRI0/0), len 64,
> > encapsulation
> > failed
> > 00:44:55: IP: s=192.168.1.211 (local), d=224.0.0.5
> (Ethernet0/1), len 68,
> > sendin
> > g broad/multicast
> > 00:44:55: %LINK-3-UPDOWN: Interface BRI0/0:1,
> changed state to up
> > 00:44:55: %DIALER-6-BIND: Interface BR0/0:1 bound
> to profile Di1
> > 00:44:56: %ISDN-6-CONNECT: Interface BRI0/0:1 is
> now connected to 8358662
> > 00:44:56: %ISDN-6-DISCONNECT: Interface BRI0/0:1
> disconnected from 8358662
> >
>
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