Understanding Prefix Lists
* IP Prefix-Lists are used for filtering BGP routes and controlling route advertisement & redistribution.
* The command ip ip-prefix TEST permit 10.0.0.0 24 less-equal 30 means:
* Matches prefix 10.0.0.0/24 exactly.
* Matches any subnet of 10.0.0.0/24 with a prefix length between 24 and 30.
Analysis of Routes:
* # 10.0.0.0/24 # Matches exactly.
* # 10.0.0.1/30 # Falls within 10.0.0.0/24 & length #30.
* # 10.0.1.0/24 # Not within 10.0.0.0/24 range.
* # 10.0.2.0/24 # Not within 10.0.0.0/24 range.
Real-World Use Case:
* BGP route filtering: Only allows 10.0.0.0/24 and its subnets (up to /30).
* Prevents unintended route propagation in large-scale networks.
# Reference: Huawei HCIE-Datacom Guide - BGP Prefix-Lists
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