Greg explores prefix lists: how they operate and how they are configured. Discover how EIGRP utilizes prefix lists for route filtering.
- [Instructor] Route filtering is also a strength of EIGRP.…It gives an administrator the ability…to filter routes inbound or outbound…on any router in the network.…This may not seem like a major feat,…but this flexibility is something that OSPF sorely lacks.…Filtering is accomplished via distribute lists.…These lists will reference an ACL,…prefix list, or a route map.…Filtering via ACL is done with either…a numbered or named standard access list.…
A permit clause allows prefixes,…while a deny clause will filter prefixes.…Using this familiar diagram,…I'll have Router 2 filter 192.168.1.0/28 over to Router 1.…This can be done from Router 2 out to Router 1,…or inbound on Router 1.…But in this case, I'll apply filtering on Router 2 outbound.…First, I'll verify the topology table on Router 1.…show ip eigrp top all.…
Make note of the entries for the prefix in question.…Next on Router 2, I'll create a named list.…ip access-list,…we'll make it standard.…And we'll call it filter-to-1.…I'll then block the prefix in question.…
Author
Released
2/28/2018- Configuring a basic Enhanced Interior Gateway Routing Protocol (EIGRP) network
- Static neighbors or K-values
- Topology exchange
- Limiting query scope
- EIGRP default routing
- EIGRP for IPv6
- Open Shortest Path First (OSPF) fundamentals
Skill Level Advanced
Duration
Views
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Introduction
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Welcome1m 3s
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What you should know1m 4s
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1. RIP
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RIPng3m 35s
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2. EIGRP Fundamentals
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Fundamentals7m 6s
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Static neighbors or K-values4m 29s
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3. EIGRP Advanced
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Topology exchange5m 16s
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EIGRP load sharing2m 51s
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Convergence3m 37s
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Limit query scope3m 22s
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Route filtering prefix lists7m 25s
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Route filtering route maps4m 27s
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Route summarization3m 39s
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EIGRP default routing5m 2s
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4. EIGRP for IPv6
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Exploring EIGRP for IPv66m 28s
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5. OSPF Fundamentals
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Fundamentals3m 18s
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Basic configuration3m 56s
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Neighborships or timers5m 30s
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Network types5m 6s
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Virtual links4m 2s
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6. OSPF Internals
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Link-state database6m 20s
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Type 3 LSAs3m 32s
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Mixed area routes2m 11s
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Metric tuning3m 22s
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7. OSPF Advanced
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Filtering LSDB5m 25s
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Filtering RIB2m 48s
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Summarization5m 32s
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Stub networks5m 9s
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8. OSPFv3
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Exploring OSPFv35m 54s
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Conclusion
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Next steps40s
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Video: Route filtering prefix lists