Transcript ROUTE10S03L08.ppt

Lab 3-3 Debrief
Implementing a Scalable Multiarea Network OSPFBased Solution
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Lab Topology
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Lab Review: What Did You Accomplish?
 Task 1: Examining OSPF Routing Information
– How can you verify the operation of an OSPF routing protocol?
– What can you see by observing the OSPF neighbors, OSPF
database, OSPF interfaces, and IP routing table?
 Task 2: Summarizing OSPF Internal Routes
– How are internal routes defined?
– How is summarization performed for internal routes?
 Task 3: Summarizing OSPF External Routes
– Where do you apply the summarization of external routes?
– How many sources of external routes exist in the lab?
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Verification
 Did you have enough information to create an implementation
plan?
 Were you able to define the OSPF topology and the content of
an IP routing table?
 Does the summary route exist on the routers in areas 3 and 24?
 Does the OSPF link-state database contain relevant
information?
 Is the routing information for the external networks
192.168.x.0/24 presented as summary information in the OSPF
link-state database and, therefore, in the IP routing tables on
relevant routers?
 Do all the routers have IP connectivity to the pod external
networks?
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Checkpoints
 Examine the IP routing information exchanged by routers
configured with the OSPF routing protocol.
 Define the internal and external routes.
 Configure the summarization of internal routes.
 Check if the adjacencies are up.
 Check if the IP routing tables and OSPF databases reflect the
summarization.
 Configure the summarization of external routes.
 Check if the adjacencies are up.
 Check if the IP routing tables and OSPF databases reflect the
summarization.
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A Sample Solution
 The OSPF topology and OSPF operation are verified, along with
the IP routing table, which shows the OSPF routes.
 Internal summarization is configured for areas 3 and 24 on ABRs.
 External summarization is configured on an ASBR router, which
redistributes external routes into the OSPF routing protocol.
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Alternative Solutions
 Change the area types in order to optimize the amount of OSPF
information entering into a specific area.
 Because changing the routing protocol is not a realistic solution,
static and default routes can be configured together with route
filtering.
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Q and A
 How can you verify OSPF routes in an IP routing table?
 How can you verify the OSPF topology and operation?
 Where do you perform summarization into areas 3 and 24?
 Where do you perform summarization of external routes?
 Is there a difference between summarization of internal and
external routes?
 How can you verify summarization results?
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Summary
 IP routing information exchanged by routers configured with
OSPF routing protocol was examined.
 You can optimize the OSPF link-state database and consequently
the IP routing table by using summarization to making the
database smaller.
 OSPF routing operation can be further optimized by summarizing
OSPF external routes.
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ROUTE v1.0—3-10