Advanced OSPF - Summarization of Routes
3 important questions on Advanced OSPF - Summarization of Routes
How does summarization normally works on an ABR?
- Multiple Type 1 LSAs summarized in 1 Type 3 LSAs
- Normally only from nonbackbone area to backbone area
- Default metric is lowest metric of composite route
What are Discard Routes and why and how are they used?
- It are routes to a Null interfaces that match the summarized networks.
- Prevents routing loops for portions of the summarized network range doesn't have a more specific route.
- AD for discard routes for internal networks is 110
- AD for discard routes for external networks is 254
What is the command used on an ASBR to configure Route Summarization for redistributed routes?
The command is:
Summary-address network mask
Summary-address network mask
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