Flashcards on Understanding Cisco Route-Maps
Understanding Cisco Route-Maps: Configuration & Examples
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Route Maps
13 cards
Card 1
Question: What is a route map on Cisco devices, and what is its basic logic?
Answer: It's a tool that uses if-then logic to apply network policies: if a condition is met (match), then an action is applied (set).
Card 2
Question: How does a route map process its statements?
Answer: Statements are processed sequentially from top to bottom, and processing stops at the first matching statement.
Card 3
Question: What happens if no route map statement matches the input?
Answer: An invisible implicit deny is reached at the end of the route map, similar to access lists.
Card 4
Question: What is the effect of a route map statement without match conditions?
Answer: An empty statement (without a match condition) matches everything.
Card 5
Question: What types of match conditions can be used in a route map?
Answer: You can use prefix-lists, access-lists, BGP attributes (such as local preference or AS path), BGP communities, packet length, interface, routing proto
Card 6
Question: What types of actions (set) can be applied within a route map?
Answer: You can change values such as the output interface, routing protocol metric, BGP attributes (local-preference, AS path, communities, weight), next-hop
Card 7
Question: If you place multiple match conditions in the same statement, how are they evaluated?
Answer: Multiple match conditions within the same statement function as a logical OR (only one needs to match).
Card 8
Question: If you configure multiple set commands in the same statement, what happens?
Answer: Multiple set commands can be configured in a single statement; all of them are applied when the statement matches.
Card 9
Question: Provide a practical example of using a route map for BGP.
Answer: Example: If the prefix matches 192.168.0.0/24 (match), then set the local preference to 500 (set).
Card 10
Question: Provide a practical example of using route maps in routing/redistribution policy (without going into redistribution details).
Answer: Example: If the prefix matches 192.168.4.0/24, then apply a specific action defined by the policy.