Can you send me the config of R1 and R2 Only interface and ospf config.
Also: "show ip ospf" on r1 and r2
I still think R2 is the type5 type7 translator. Can you debug the ospf lsa
on R1 to check where it reveives those updates from
Kind regards,
Maarten Vervoorn
2010/10/28 sp-ie m <sp.ccie.me_at_gmail.com>
> R1-R2 (12.1.1.0/24) in Area 0.
> R1-R3 (13.1.1.0/24) in Area 1
> R2-R4 (24.1.1.0/24) in Area 1
> R3-R4 (34.1.1.0/24)in Area1.
>
>
> R1-----Area0-----R2
> | |
>
> Area1 Area1
> | |
> R3-----Area1-----R4
>
>
>
> IP addresssing -
> R1 = .1
> R2 = .2
> R3 =.3
> R4 = .4
>
> Router IDs -
> R1 = 1.1.1.1
> R2 = 2.2.2.2
> R3 = 3.3.3.3
> R4 = 4.4..4.4
>
>
> Logs:
>
>
> R3#o d ns 134.1.1.0
> R3#sh ip ospf d ns 134.1.1.0
>
> OSPF Router with ID (3.3.3.3) (Process ID 1)
>
> Type-7 AS External Link States (Area 1)
>
> LS age: 111
> Options: (No TOS-capability, Type 7/5 translation, DC)
> LS Type: AS External Link
> Link State ID: 134.1.1.0 (External Network Number )
> Advertising Router: 3.3.3.3
> LS Seq Number: 80000001
> Checksum: 0x2056
> Length: 36
> Network Mask: /24
> Metric Type: 1 (Comparable directly to link state metric)
> TOS: 0
> Metric: 20
> Forward Address: 3.3.3.3
> External Route Tag: 0
>
> Routing Bit Set on this LSA
> LS age: 116
> Options: (No TOS-capability, Type 7/5 translation, DC)
> LS Type: AS External Link
> Link State ID: 134.1.1.0 (External Network Number )
> Advertising Router: 4.4.4.4
> LS Seq Number: 80000001
> Checksum: 0xB736
> Length: 36
> Network Mask: /24
> Metric Type: 2 (Larger than any link state path)
> TOS: 0
> Metric: 20
> Forward Address: 4.4.4.4
> External Route Tag: 0
>
> R3#
>
>
>
> R4#o d ns 134.1.1.0
> R4#sh ip ospf d ns 134.1.1.0
>
> OSPF Router with ID (4.4.4.4) (Process ID 1)
>
> Type-7 AS External Link States (Area 1)
>
> Routing Bit Set on this LSA
> LS age: 60
> Options: (No TOS-capability, Type 7/5 translation, DC)
> LS Type: AS External Link
> Link State ID: 134.1.1.0 (External Network Number )
> Advertising Router: 3.3.3.3
> LS Seq Number: 80000001
> Checksum: 0x2056
> Length: 36
> Network Mask: /24
> Metric Type: 1 (Comparable directly to link state metric)
> TOS: 0
> Metric: 20
> Forward Address: 3.3.3.3
> External Route Tag: 0
>
> LS age: 65
> Options: (No TOS-capability, Type 7/5 translation, DC)
> LS Type: AS External Link
> Link State ID: 134.1.1.0 (External Network Number )
> Advertising Router: 4.4.4.4
> LS Seq Number: 80000001
> Checksum: 0xB736
> Length: 36
> Network Mask: /24
> Metric Type: 2 (Larger than any link state path)
> TOS: 0
> Metric: 20
> Forward Address: 4.4.4.4
> External Route Tag: 0
>
> R4#
>
>
> R1#sir 134.1.1.0 l
> Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2
> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
> ia - IS-IS inter area, * - candidate default, U - per-user static route
> o - ODR, P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> 134.1.0.0/24 is subnetted, 1 subnets
> O E1 134.1.1.0 [110/85] via 13.1.1.3, 00:02:02, Serial1/1
>
> R1#o d ns 134.1.1.0
> R1#sh ip ospf d ns 134.1.1.0
>
> OSPF Router with ID (1.1.1.1) (Process ID 1)
>
> Type-7 AS External Link States (Area 1)
>
> LS age: 466
> Options: (No TOS-capability, Type 7/5 translation, DC)
> LS Type: AS External Link
> Link State ID: 134.1.1.0 (External Network Number )
> Advertising Router: 3.3.3.3
> LS Seq Number: 80000001
> Checksum: 0x2056
> Length: 36
> Network Mask: /24
> Metric Type: 1 (Comparable directly to link state metric)
> TOS: 0
> Metric: 20
> Forward Address: 3.3.3.3
> External Route Tag: 0
>
> LS age: 471
> Options: (No TOS-capability, Type 7/5 translation, DC)
> LS Type: AS External Link
> Link State ID: 134.1.1.0 (External Network Number )
> Advertising Router: 4.4.4.4
> LS Seq Number: 80000001
> Checksum: 0xB736
> Length: 36
> Network Mask: /24
> Metric Type: 2 (Larger than any link state path)
> TOS: 0
> Metric: 20
> Forward Address: 4.4.4.4
> External Route Tag: 0
>
> R1#o d ex 134.1.1.0
> R1#sh ip ospf d ex 134.1.1.0
>
> OSPF Router with ID (1.1.1.1) (Process ID 1)
>
> Type-5 AS External Link States
>
> Routing Bit Set on this LSA
> LS age: 447
> Options: (No TOS-capability, DC)
> LS Type: AS External Link
> Link State ID: 134.1.1.0 (External Network Number )
> Advertising Router: 2.2.2.2
> LS Seq Number: 80000001
> Checksum: 0xEA0F
> Length: 36
> Network Mask: /24
> Metric Type: 1 (Comparable directly to link state metric)
> TOS: 0
> Metric: 20
> Forward Address: 3.3.3.3
> External Route Tag: 0
>
> R1#
>
>
>
> R2#sir 134.1.1.0 l
> Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2
> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
> ia - IS-IS inter area, * - candidate default, U - per-user static route
> o - ODR, P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> 134.1.0.0/24 is subnetted, 1 subnets
> O N1 134.1.1.0 [110/149] via 24.1.1.4, 00:06:47, Serial1/1
> R2#
> R2#o d ex 134.1.1.0
> R2#sh ip ospf d ex 134.1.1.0
>
> OSPF Router with ID (2.2.2.2) (Process ID 1)
>
> Type-5 AS External Link States
>
> LS age: 493
> Options: (No TOS-capability, DC)
> LS Type: AS External Link
> Link State ID: 134.1.1.0 (External Network Number )
> Advertising Router: 2.2.2.2
> LS Seq Number: 80000001
> Checksum: 0xEA0F
> Length: 36
> Network Mask: /24
> Metric Type: 1 (Comparable directly to link state metric)
> TOS: 0
> Metric: 20
> Forward Address: 3.3.3.3
> External Route Tag: 0
>
> R2#sh ip ospf d ns 134.1.1.0
>
> OSPF Router with ID (2.2.2.2) (Process ID 1)
>
> Type-7 AS External Link States (Area 1)
>
> Routing Bit Set on this LSA
> LS age: 522
> Options: (No TOS-capability, Type 7/5 translation, DC)
> LS Type: AS External Link
> Link State ID: 134.1.1.0 (External Network Number )
> Advertising Router: 3.3.3.3
> LS Seq Number: 80000001
> Checksum: 0x2056
> Length: 36
> Network Mask: /24
> Metric Type: 1 (Comparable directly to link state metric)
> TOS: 0
> Metric: 20
> Forward Address: 3.3.3.3
> External Route Tag: 0
>
> LS age: 527
> Options: (No TOS-capability, Type 7/5 translation, DC)
> LS Type: AS External Link
> Link State ID: 134.1.1.0 (External Network Number )
> Advertising Router: 4.4.4.4
> LS Seq Number: 80000001
> Checksum: 0xB736
> Length: 36
> Network Mask: /24
> Metric Type: 2 (Larger than any link state path)
> TOS: 0
> Metric: 20
> Forward Address: 4.4.4.4
> External Route Tag: 0
>
>
>
> On Wed, Oct 27, 2010 at 6:50 PM, sp-ie m <sp.ccie.me_at_gmail.com> wrote:
> > Hey guys,
> >
> > I'm confused if Intra-area N1 will be left out and Inter-Area E1 will
> > be chosen if E1 is seen from highest router-id NSSA ABR .
> >
> > I hv a square topology.
> >
> > Area 1 is NSSA.
> >
> > R1-----Area0-----R2
> > | |
> > Area1 Area1
> > | |
> > R3-----Area1-----R4
> >
> > R1-R2 in Area 0.
> > R1-R3 in Area 1
> > R2-R4 in Area 1
> > R3-R4 in Area1.
> >
> > Router ID R1 = 1.1.1.1
> > R2 = 2.2.2.2
> > R3 = 3.3.3.3
> > R4 = 4.4..4.4
> >
> > Question: Both R3 and R4 are redistributing a static route 134.1.1.0
> > into Area1. R3 is redistributing it as N1 while R4 as N2.
> > On R2, I can see it receives 134.1.1.0/24 as N1 from R4. This makes
> > perfect sense as N1 is pref over N2.
> >
> > On R1, I can see it receives 134.1.1.0/24 as E1 route from R2 but the
> > next hop is R3's interface IP. This part is tricky.
> > Which rule says that E1 from Inter-area neighbor will supersede N1
> > from local area?? I know this is somehow happening coz R4 has highest
> > router-ID NSSA ABR but dont quite understand how intra-area N1 is left
> > out and Inter-Area E1 is chosen.
> >
> > Tried a cursory look in few popular workbooks but didnt find similar
> issue.
>
>
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Received on Thu Oct 28 2010 - 08:04:48 ART
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