From: William Swedberg (swedbergwp@xxxxxxxxx)
Date: Fri Jul 28 2000 - 09:55:15 GMT-3
In ospf a router id will be the highest IP address of
an ACTIVE interface without the presence of a
loopback. If one or more loopbacks are present it
will be the highest IP of the loopbacks. Make sure
you look at the order in which you configure things.
If you configure loopbacks then ospf, the router will
be one of the loopbacks. If you do it in the reverse
order, untill you reboot or do a shut on the interface
that the highest IP, the router id will no be what you
might think.
In vitual links the destination of the virtual link
must be the router ID. I have found that virtual
links do funny things when you first configure them.
I configure them, wr mem, and reload the routers.
Hope this helps...
William Swedberg CCNP CCDP
--- "D. J. Jones" <meganac@home.com> wrote:
> Hi Aaron,
>
> I may be confused, but is there any reason you are
> trying to setup a virtual
> link between a loopback interface and a serial
> interface. Why don't you set
> it up where each loopback is pointing to each
> otheras follows:
>
> On r3
>
> interface Loopback1
> ip address 10.44.2.1 255.255.255.252
> etc
>
> router ospf 1
> network 10.44.2.1 0.0.0.0 area 3
> area 3 virtual-link 10.34.1.1 (assume this is your
> r4 loopback1)
>
> On r4
> interface Loopback1
> ip address 10.34.1.1 255.255.255.252
> etc
>
> router ospf 1
> network 10.34.1.1 0.0.0.0 area 3
> area 3 virtual-link 10.44.2.1
>
> After you have it all set up, check it with the
> command 'sh ip ospf
> virtual-links'
>
> I have not set this up yet, but I think it is
> reasonable. If I remember
> correctly, by default, the
> ospf outer id is the address assigned to the first
> loopback interface or if
> the loopback is not
> defined, the next highest numbered ip address on the
> router. So in your
> case, if the router id
> is assigned by use of the loopback interface, it
> will always exists as long
> as the router is reachable via a physical interface
> (eg. serial) the virtual
> link will work.
>
> I ask some of the ospf gurus on the list to
> clarify/expand on this so we all
> come away with a
> good understanding..dj
>
> ----- Original Message -----
> From: "Aaron DuShey" <adushey@yahoo.com>
> To: "CCIE (E-mail)" <ccielab@groupstudy.com>
> Sent: Wednesday, July 26, 2000 4:45 PM
> Subject: bootcamp lab 1-r3-r4 stuck in INIT-why?
>
>
> > I can't get r3-r4 to become adjacent. They are
> stuck in init? Any hints?
> > ip tcp synwait-time 5
> > no ip domain-lookup
> > !
> > !
> > voice-port 1/0/0
> > !
> > voice-port 1/0/1
> > !
> > voice-port 1/1/0
> > !
> > voice-port 1/1/1
> > !
> > !
> > interface Loopback0
> > ip address 10.44.1.1 255.255.255.0
> > !
> > interface Loopback1
> > ip address 10.44.2.1 255.255.255.0
> > !
> > interface BRI0/0
> > no ip address
> > shutdown
> > !
> > interface Ethernet0/0
> > ip address 10.4.1.1 255.255.0.0
> > no lat enabled
> > !
> > interface Serial0/0
> > ip address 10.34.1.2 255.255.0.0
> > no ip mroute-cache
> > !
> > interface TokenRing0/0
> > no ip address
> > shutdown
> > ring-speed 16
> > !
> > router ospf 1
> > network 10.4.0.0 0.0.255.255 area 3
> > network 10.34.0.0 0.0.255.255 area 3
> > network 10.44.0.0 0.0.255.255 area 44
> > area 3 virtual-link 10.34.1.1
> > area 44 range 10.44.0.0 255.255.0.0
> > !
> > ip classless
> > logging buffered 4096 debugging
> > !
> > !
> > line con 0
> > exec-timeout 0 0
> > logging synchronous
> > line aux 0
> > line vty 0 4
> > login
> > !
> > interface Ethernet0/0
> > no ip address
> > shutdown
> > no lat enabled
> > !
> > interface Serial0/0
> > ip address 10.10.1.3 255.255.0.0
> > encapsulation frame-relay
> > ip ospf priority 0
> > no ip mroute-cache
> > ip policy route-map frame
> > no fair-queue
> > frame-relay map ip 10.10.1.1 301 broadcast
> > !
> > interface TokenRing0/0
> > ip address 10.3.1.1 255.255.0.0
> > ring-speed 16
> > !
> > interface Serial0/1
> > ip address 10.34.1.1 255.255.0.0
> > clockrate 8000000
> > !
> > interface FastEthernet1/0
> > no ip address
> > shutdown
> > no lat enabled
> > !
> > router ospf 1
> > network 10.10.1.0 0.0.0.255 area 0
> > network 10.34.0.0 0.0.255.255 area 3
> > area 3 virtual-link 10.44.2.1
> > ospf log-adjacency-changes
> > !
> > ip local policy route-map frame
> > ip classless
> > logging buffered 4096 debugging
> > access-list 100 deny ip any 10.3.0.0 0.0.255.255
> > access-list 100 deny ip any 10.34.0.0 0.0.255.255
> > access-list 100 deny ip any 10.44.0.0 0.0.255.255
> > access-list 100 deny ip any 10.4.0.0 0.0.255.255
> > access-list 100 permit ip any any
> > route-map frame permit 10
> > match ip address 100
> > set ip next-hop 10.10.1.1
> > !
> > !
> > !
> > line con 0
> > exec-timeout 0 0
> > logging synchronous
> > line aux 0
> > line vty 0 4
> > login
> > !
> > end
> > r3#
> > end
> > r3#sh ip ospf neig
> > Neighbor ID Pri State Dead Time Address Interface
> > 10.10.1.1 1 FULL/DR 00:01:52 10.10.1.1 Serial0/0
> > 10.44.2.1 1 INIT/ - 00:00:37 10.34.1.2 Serial0/1
> > r3#
> > thanks
> > ad
> >
> >
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