3.6.d Implement and troubleshoot network types area types and router types

3.6.d [iii] Internal router, ABR, ASBR

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ospf_stub_nssa

your network should look a lot like this before stub and nssa.

ospf_nssa_01

router 1 lost the elections on both links. fix that so it looks like this:

ospf_nssa_02

much nicer…

this is stub area 35 ruining your beautiful network:

ospf_nssa_04

and below is an example of nssa playing nicer… when you’re screwing around with nssa try the debug ip ospf flood command; that’ll put some hair on your ass… needless to say; NOT on a production network…

R4(config-router)#do sh ip ospf data nssa

OSPF Router with ID (4.4.4.4) (Process ID 1)

Type-7 AS External Link States (Area 24)

LS age: 354
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 6.6.6.0 (External Network Number )
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0xCA99
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

LS age: 354
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 11.11.11.0 (External Network Number )
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x163F
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

LS age: 371
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 12.12.12.0 (External Network Number )
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0xF160
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

LS age: 373
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 13.13.13.0 (External Network Number )
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0xCD81
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

LS age: 378
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 14.14.14.0 (External Network Number )
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0xA9A2
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

LS age: 380
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 192.168.46.0 (External Network Number )
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0xF5E8
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