From: Carlos G Mendioroz (tron@xxxxxxxxxxx)
Date: Mon Jul 08 2002 - 17:00:56 GMT-3
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
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:36:22 GMT-3