From: Jason Gardiner (gardiner@xxxxxxxxxx)
Date: Wed Nov 07 2001 - 22:32:26 GMT-3
Actually, it was on a Virtual Toekn Ring interface, which OSPF said it was
going to treat as a loopback. I think that might be the issue. Although
the ethernet seemed to have a similar problem. Will check and see.
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
On Wed, 7 Nov 2001, Krake, Kris wrote:
> Any chance the network is configured on a loopback? Unless you've got 11.3
> or later IOS OSPF will advertise only the host route and not the network on
> a loopback. Didn't see a config so I'm not sure that isn't the case.
> Reason that I mention that is because redistributing is one way to fix
> that....
>
> From http://www.cisco.com/warp/public/104/9.html#QB
> Q: Why are loopbacks advertised as /32 host routes in OSPF?
>
> A: Loopbacks are considered host routes in OSPF, and they're advertised as
> /32. For more information, see section 9.1 of RFC 2328. In Cisco IOS .
> version 11.3T and 12.0, if the ip ospf network point-to-point command is
> configured under loopbacks, then OSPF advertises the loopback subnet as the
> actual subnet configured on loopbacks.
>
>
> Kris
>
>
>
> -----Original Message-----
> From: Jason Gardiner [mailto:gardiner@sprint.net]
> Sent: Wednesday, November 07, 2001 5:04 PM
> To: SFeldberg@edeltacom.com
> Cc: CCIE Groupstudy; Courtney Foster; Larson, Chris (Contractor); lgao;
> nobody@groupstudy.com; 'Ben-Shalom, Omer'; Dennis #6
> Subject: Re: CCBootCamp 5 OSPF over frame question
>
>
> I'll try it at home later and post if I have the same issues. I'm just
> trying way to much weird stiff on these routers - Virtual Token rings
> interfaces, DLSW and Back-to-back AUX dialer connections - to shoot the
> problem. I did notice that you are still using a /8 inverse mask on the
> R4. Change that to a host mask and see if it still works right :)
>
>
> SFeldberg@edeltacom.com wrote:
> >
> > 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
> <lgao@cisco.com>,
> > nobody@groups Courtney Foster
> <cfoster@cnr.edu>, Dennis #6
> > tudy.com <vacant@home.com>, CCIE
> Groupstudy
> > <ccielab@groupstudy.com>
> > Subject: Re: CCBootCamp 5
> OSPF over 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
> --
> 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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