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10 Cards in this Set
- Front
- Back
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What is redistribution?
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The passing of routing info from one routing protocol to another.
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Where is redistribution performed?
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On 'border routers' running multiple routing protocols.
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What are some redistribution caveats?
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Information is lost in the transfer.
Can create suboptimal routes. Can create routing loops. |
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What is a transit routing domain?
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An area that serves as a path between two other routing domains (bi-directional redistribution).
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What is a seed metric?
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The initial metric assigned to external routes when redistributing.
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How do routing loops typically occur with redistribution?
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When internal routes (IGP) re-enter the routing domain as external prefixes due to two-way redistribution.
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Can a loop-free topology be guaranteed when using redistribution? Why?
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No IGP can guarantee a loop-free topology when using redistribution due to the loss of information that occurs.
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How should a router handle prefix information when redistributing?
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Always prefer internal prefix information over any external information.
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How can a router be configured to prefer internal routes over external routes?
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Can be done ensuring the administrative distance of external routes is higher than internal ones. Also use a high seed metric when redistributing into RIP.
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How can the split-horizon rule be observed when configuring redistribution?
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Can be done by tagging routes on egress and then blocking those route tags on other points of ingress.
Can also be done by configuring one routing domain as a central transit with all other domains as stub. |
