OSPF - NSSA no automatic default route

OSPF - Type1 LSA

OSPF Type 5 LSA

OSPF Type 7 LSA

OSPF

Type: #OSPF #stub #LSA 

The following table indicates what [OSPF LSA Types](/ospf-lsa-types) are allowed within  [OSPF](/ospf)  stub areas of different types:


| LSA/Area                    | Normal | Stub | Totally Stub | NSSA | Totally NSSA |
| --------------------------- | ------ | ---- | ------------ | ---- | ------------ |
| **[1](/ospf-type1-lsa)** | ✓      | ✓    | ✓            | ✓    | ✓            |
| **2**                       | ✓      | ✓    | ✓            | ✓    | ✓            |
| **3**                       | ✓      | ✓*   | -*           | ✓    | -*           |
| **[4](/ospf-type-4-lsa)**  | ✓      | -    | -            | -    | -            |
| **5**                       | ✓      | -    | -            | -    | -            |
| **[7](/ospf-type-7-lsa)**  | -      | -    | -            | ✓*   | ✓            |

'*' indicates a default route LSA type

## Links

https://networklessons.com/ospf/introduction-to-ospf-stub-areas

https://networklessons.com/ospf/ospf-lsa-types-explained

https://community.cisco.com/t5/routing/which-ospf-areas-prevent-lsa-type-4-lsa-type-5/td-p/3825302

OSPF - Stub areas and allowed LSAs

Network design - confine VLANs to as few access switches as possible

Network planes

Networking - Understanding Chassis devices

Networking - what is a socket

Networks - Overlay Network

Networks - Overlay Transport Virtualization (OTV)

Networks - Spanning Layer 2 networks across remote sites

Networks - Underlay Network

Next Generation Multicast Virtual Private Network (NG-MVPN)

Next Hop

Nexus - using vPC with HSRP

Nexus - what is vPC

Nexus lacp rate fast

Nexus

OSI Model

OSPF - A comparison with IS-IS

OSPF - ABR has at least one interface in Area 0

OSPF - ASBR E-bit in an LSA

OSPF - Adjacencies in a Multi-Access network segment

OSPF - Adjacency Between NBMA and P2MP Non-Broadcast Networks

OSPF - Advertising point to multipoint networks

OSPF - Area Border Router (ABR)

OSPF - Autonomous System Boundary Router (ASBR)

OSPF - BDR is elected before DR

OSPF - Cost of summarized routes

OSPF - DR-BDR election per broadcast domain

OSPF - DR-BDR election priority of zero

OSPF - Database Example

OSPF - Default route advertisement next hop IP

OSPF - Down (DN) Bit

OSPF - ECMP across two different areas

OSPF - ECMP to destination in Area 0

OSPF - Enabling authentication

OSPF - HMAC-SHA Extended Authentication

OSPF - Identifying the router type

OSPF - LSA Max Age

OSPF - LSA Refresh Time

OSPF - LSA checksum

OSPF - Link ID and ADV Router in the OSPF database

OSPF - Link ID in the OSPF database

OSPF - Link State Updates (LSUs)

OSPF - MPLS SuperBackbone

OSPF - NBMA neighbors listen on 224.0.0.5

OSPF - NSSA P-bit

OSPF - Neighbor states

OSPF - Neighbor vs Adjacency

OSPF - OSPFv3 authentication

OSPF - Propagation of routes between areas

OSPF - Stuck in ATTEMPT neighbor state

OSPF - Stuck in ExStart or Exchange states

OSPF - Type 5 LSA filtering on an ASBR

OSPF - Update pacing timers

OSPF - capablity vrf-lite

OSPF - control plane vs data plane loops

OSPF - default-information originate always command

OSPF - distance command

OSPF - distribute-list filtering

OSPF - manual neighbor configuration

OSPF - network type mismatch

OSPF - non-zero Forwarding Address example

OSPF - point-to-multipoint network type

OSPF - route summarization

OSPF - summary-address nssa-only on an ABR

OSPF - what triggers a DR-BDR election

OSPF ABR Type 3 LSA filtering using access lists

OSPF ABR and Loop Prevention

OSPF Authentication for v2 and v3

OSPF BDR to DR Transition Time

OSPF DR BDR election and neighbor adjacencies

OSPF DR BDR election criteria

OSPF DR BDR election process

OSPF Database Exchange Process Master Slave Election

OSPF Design - When to create new instance

OSPF Determining which LSA is newer

OSPF Discontiguous Area 0

OSPF Do Not Age (DNA) Flag

OSPF E1 E2 N1 N2 routes

OSPF Forwarding Address

OSPF Hello packets unicast and multicast

OSPF IP Unnumbered

OSPF IS-IS comparison

OSPF Incremental SPF and receipt of LSAs

OSPF LSA Persistence with DNA flag

OSPF LSA Recursion

OSPF LSA Sequence Numbers

OSPF LSA Types

OSPF NSSA ABR advertises default route

OSPF Not So Stubby Area NSSA

OSPF Packet Types and Their Transmission Methods

OSPF Path selection

OSPF Prefix Suppression Considerations

OSPF Route Filtering

OSPF Routing Bit

OSPF SPF Scheduling and throttling timers

OSPF Summarization Restrictions Within an Area

OSPF TTL Security Check

OSPF Troubleshooting

LSA/Area	Normal	Stub	Totally Stub	NSSA	Totally NSSA
1	✓	✓	✓	✓	✓
2	✓	✓	✓	✓	✓
3	✓	✓*	-*	✓	-*
4	✓	-	-	-	-
5	✓	-	-	-	-
7	-	-	-	✓*	✓

OSPF - Stub areas and allowed LSAs

Links

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