From: SFeldberg@xxxxxxxxxxxxx
Date: Wed Nov 07 2001 - 18:51:39 GMT-3
Post your configs- I'll bet you were had an OSPF network type of
point-to-multipoint. I built the scenario using point-to-point links and
it did what it was supposed to. See below:
r2#sh run
!
interface Ethernet0
ip address 20.1.1.1 255.255.255.0
no ip directed-broadcast
!
interface Serial1
ip address 10.1.1.2 255.255.255.0
no ip directed-broadcast
clockrate 64000
!
router ospf 1
network 10.1.1.2 0.0.0.0 area 0
network 20.1.1.1 0.0.0.0 area 1
r2#sh ip route
20.0.0.0/24 is subnetted, 1 subnets
C 20.1.1.0 is directly connected, Ethernet0
10.0.0.0/24 is subnetted, 2 subnets
O 10.2.2.0 [110/74] via 10.1.1.4, 00:04:08, Serial1
C 10.1.1.0 is directly connected, Serial1
r2#sh ip ospf
Routing Process "ospf 1" with ID 10.1.1.2
Supports only single TOS(TOS0) routes
It is an area border router
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
Number of external LSA 0. Checksum Sum 0x0
Number of DCbitless external LSA 0
Number of DoNotAge external LSA 0
Number of areas in this router is 2. 2 normal 0 stub 0 nssa
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm executed 18 times
Area ranges are
Number of LSA 5. Checksum Sum 0x219AA
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Area 1
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm executed 6 times
Area ranges are
Number of LSA 3. Checksum Sum 0x1634B
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
r2#sh ip ospf int s1
Serial1 is up, line protocol is up
Internet Address 10.1.1.2/24, Area 0
Process ID 1, Router ID 20.1.1.1, Network Type POINT_TO_POINT, Cost: 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:01
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.2.2.2
Suppress hello for 0 neighbor(s)
r4#sh run
!
interface Ethernet0
ip address 10.2.2.2 255.255.255.0
no ip directed-broadcast
!
interface Serial1
ip address 10.1.1.4 255.255.255.0
no ip directed-broadcast
!
router ospf 1
network 10.0.0.0 0.255.255.255 area 0
r4#sh ip route
20.0.0.0/24 is subnetted, 1 subnets
O IA 20.1.1.0 [110/74] via 10.1.1.2, 00:04:19, Serial1
10.0.0.0/24 is subnetted, 2 subnets
C 10.2.2.0 is directly connected, Ethernet0
C 10.1.1.0 is directly connected, Serial1
r4#sh ip ospf
Routing Process "ospf 1" with ID 10.1.1.4
Supports only single TOS(TOS0) routes
Supports opaque LSA
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
Number of external LSA 0. Checksum Sum 0x0
Number of opaque AS LSA 0. Checksum Sum 0x0
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 2
Area has no authentication
SPF algorithm executed 18 times
Area ranges are
Number of LSA 7. Checksum Sum 0x21240
Number of opaque link LSA 0. Checksum Sum 0x0
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
r4#sh ip ospf int s1
Serial1 is up, line protocol is up
Internet Address 10.1.1.4/24, Area 0
Process ID 1, Router ID 10.2.2.2, Network Type POINT_TO_POINT, Cost: 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:04
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 20.1.1.1
Suppress hello for 0 neighbor(s)
Steve
Jason
Gardiner To: "Larson, Chris (Contractor)"
<gardiner@spr <Chris.Larson@ed.gov>
int.net> cc: "'Ben-Shalom, Omer'"
Sent by: <omer.ben-shalom@intel.com>, lgao <lga
o@cisco.com>,
nobody@groups Courtney Foster <cfoster@cnr.edu>, Den
nis #6
tudy.com <vacant@home.com>, CCIE Groupstudy
Subject: Re: CCBootCamp 5 OSPF ove
r frame
11/07/2001 question
04:35 PM
Please
respond to
Jason
Gardiner
OK, I tried to put this to the test. When I configured networks with a
host mask, they show up in the remote routing table as /32s. In order
for the whole network to show up, I had to redist connected subnets.
There's to many variables in this setup. I prefer using the network
statement with the mask of the interface to be injected. It just works
better for me.
"Larson, Chris (Contractor)" wrote:
>
> Good point. I never really thought about it that way, but your right of
> course. The network statement simply identifies (in the case of OSPF)
which
> interfaces to advertise out of and therefore a host route would work.
>
> Thinking about it like that, I cannot really think of any instances where
> you would not want to , or could not simply use a host route. Would
everyone
> agree with that????
>
> Are there instances where you could not?
>
> -----Original Message-----
> From: Ben-Shalom, Omer [mailto:omer.ben-shalom@intel.com]
> Sent: Wednesday, November 07, 2001 3:00 PM
> To: lgao; Courtney Foster
> Cc: Dennis #6; CCIE Groupstudy
> Subject: RE: CCBootCamp 5 OSPF over frame question
>
> The OSPF network statement really has nothing to do with networks it is
an
> access list (and that is why it uses the mask the way it does) to filter
the
> interfaces to take part in OSPF, you COULD use the right network mask for
> the interfaces or not, that is really a style issue.
> A while back I asked the same thing stating that I personally prefer the
> network mask to a host mask but later was convinced by a number of good
> people that unless you have a big router with many interfaces using the
host
> mask is cleaner and less prone to mistakes and surprises so I am now
using a
> host mask.
>
> Again - both will work and this is really a style issue nothing more.
>
> Omer.
>
> -----Original Message-----
> From: lgao [mailto:lgao@cisco.com]
> Sent: Wed, November 07, 2001 7:57 PM
> To: Courtney Foster
> Cc: Dennis #6; CCIE Groupstudy
> Subject: Re: CCBootCamp 5 OSPF over frame question
>
> I don't think it is the best practice to advertise a host mask, it looks
> like a lazy thing that dont' want to figure out what the true mask is.
>
> Courtney Foster wrote:
>
> > It is a host specific mask....because you don't have broadcast...you
are
> > telling OSPF that this host is Area 10...At least that's what I think
> >
> > -----Original Message-----
> > From: Dennis #6 [mailto:vacant@home.com]
> > Sent: Wednesday, November 07, 2001 12:04 PM
> > To: CCIE Groupstudy
> > Subject: CCBootCamp 5 OSPF over frame question
> >
> > I noticed on the CCBootCamp lab 5 solution that the wildcard mask on
> > each router for the point-to-multipoint frame connections is 0.0.0.0
> > (see below). Is there a good reason for using this mask as opposed to
> > 0.0.0.255 (it's a /24 subnet)? When is it best to use 0.0.0.0 versus
> > 0.0.0.255. I thought it was normal to use the inverse mask that
> > corresponds to the subnet mask on that interface. What am I missing?
> >
> > router ospf 1
> > redistribute igrp 1 metric 20 metric-type 1 subnets
> > network 172.168.100.5 0.0.0.0 area 10 !point to multipoint frame
> > connection network 137.20.20.0 0.0.0.255 area 0 area 10 virtual-link
> > 172.168.30.97 area 10 virtual-link 172.168.100.6
> >
> > Thanks,
> >
> > Dennis #6
-- Thanks,Jason Gardiner Supervisor, Engineering Services Sprint <Insert Division Name>
"You can swim all day in the Sea of Knowledge and still come out completely dry. Most people do."
- Norton Juster
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