Re: Summarizing LSA-3 in ospf

From: Fahad Khan (fahad.khan@gmail.com)
Date: Fri Aug 15 2008 - 06:01:21 ART

ABR1 -

R1#sh run | s ospf
router ospf 1
 log-adjacency-changes
 network 6.6.0.1 0.0.0.0 area 1
 network 6.6.1.1 0.0.0.0 area 1
 network 6.6.2.1 0.0.0.0 area 1
 network 6.6.3.1 0.0.0.0 area 1
 network 10.0.0.1 0.0.0.0 area 0

ABR2 -

R2#sh run | s ospf
router ospf 1
 log-adjacency-changes
 area 0 range 6.6.0.0 255.255.252.0
 network 7.7.0.1 0.0.0.0 area 2
 network 10.0.0.2 0.0.0.0 area 0

Show ip route ospf @ ABR2

R2#sh ip route ospf
     6.0.0.0/32 is subnetted, 4 subnets
O IA 6.6.1.1 [110/65] via 10.0.0.1, 00:01:38, Serial1/0
O IA 6.6.0.1 [110/65] via 10.0.0.1, 00:01:38, Serial1/0
O IA 6.6.3.1 [110/65] via 10.0.0.1, 00:01:38, Serial1/0
O IA 6.6.2.1 [110/65] via 10.0.0.1, 00:01:38, Serial1/0

show ip ospf database @ ABR2

R2#sh ip ospf database

            OSPF Router with ID (197.168.3.1) (Process ID 1)

                Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count
197.168.3.1 197.168.3.1 107 0x80000006 0x000D20 2
197.168.7.1 197.168.7.1 107 0x80000008 0x008E99 2

                Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum
6.6.0.1 197.168.7.1 1023 0x80000001 0x008236
6.6.1.1 197.168.7.1 843 0x80000001 0x007740
6.6.2.1 197.168.7.1 833 0x80000001 0x006C4A
6.6.3.1 197.168.7.1 833 0x80000001 0x006154
7.7.0.1 197.168.3.1 111 0x80000001 0x008535

                Router Link States (Area 2)

Link ID ADV Router Age Seq# Checksum Link count
197.168.3.1 197.168.3.1 111 0x80000003 0x00FA40 1

                Summary Net Link States (Area 2)

Link ID ADV Router Age Seq# Checksum
6.6.0.1 197.168.3.1 106 0x80000001 0x00215B
6.6.1.1 197.168.3.1 110 0x80000001 0x001665
6.6.2.1 197.168.3.1 110 0x80000001 0x000B6F
6.6.3.1 197.168.3.1 110 0x80000001 0x00FF79
10.0.0.0 197.168.3.1 115 0x80000001 0x00354B

As you can see that there is no any summary entry in database table of Area
2.

On 8/15/08, Joseph Brunner <joe@affirmedsystems.com> wrote:
>
> "kindly" post your configs.
>
> I have used this identical config in my lab. And I was able to.
>
> -Joe
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Fahad Khan
> Sent: Thursday, August 14, 2008 3:03 PM
> To: akyccie
> Cc: Cisco certification
> Subject: Re: Summarizing LSA-3 in ospf
>
> No dear, I am unable to get the desired results. Kindly lab it for
> confirming me. I came to know that, in the command "area <*id*> range" ,
> this* id* must be the area id when these specific routes reside. I just
> wanna know the logic, why i am unable to send the summary of OIA routes?
>
> Thanks,
>
> On 8/14/08, akyccie <akyccie@gmail.com> wrote:
> >
> > I guess you need use area range to summaries here.
> >
> > ----- Original Message ----- From: "Fahad Khan" <fahad.khan@gmail.com>
> > To: "Cisco certification" <ccielab@groupstudy.com>
> > Sent: Friday, August 15, 2008 12:18 AM
> > Subject: Summarizing LSA-3 in ospf
> >
> >
> > Hi Experts,
> >>
> >> Lets have a scenario,
> >>
> >> Area 1 and Area 2 both are connected to Area 0, So we have Two ABRs,
> >>
> >> ABR1 -- Connecting Area1 with Area 0
> >>
> >> ABR2 -- Connecting Area2 with Area 0
> >>
> >> The routes coming from Area 1 to Area 0 will be seen as OIA (LSA 3) on
> >> ABR
> >> 2. I *can not summarize* these routes and send a summary to Area 2 (by
> >> configuring summary on ABR2).
> >>
> >> Why???? Why the algo is not permitting me? Plz shed light over the
> logic.
> >>
> >> Thanks for the help in advance.
> >> regards,
> >> --
> >> *FAHAD KHAN
> >>
> >> BE Computer Systems NED,
> >>
> >> CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE (Written)
> >>
> >> Systems Support Engineer, Premier Systems (Pvt) limited,
> >>
> >> Karachi, Pakistan
> >>
> >> 92-321-2370510.*
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
>
>
> --
> *FAHAD KHAN
>
> BE Computer Systems NED,
>
> CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE (Written)
>
> Systems Support Engineer, Premier Systems (Pvt) limited,
>
> Karachi, Pakistan
>
> 92-321-2370510.*
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>
> 

-- 
*FAHAD KHAN

BE Computer Systems NED,

CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE  (Written)

Systems Support Engineer, Premier Systems (Pvt) limited,

Karachi, Pakistan

92-321-2370510.*

Blogs and organic groups at http://www.ccie.net

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