Term
| In which direction is route redistribution always performed? |
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Definition
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Route redistribution is always performed outbound, which means that the router doing the redistribution never changes its own routing table.
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Term
| What must be in a router's routing table for it to redistribute specific routes? |
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Definition
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Routes must be in a router's routing table for them to be redistrubuted.
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Term
What command is used to set the seed metric for all redistributed routes? |
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Definition
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default-metric metric-value
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Term
| What should the seed metric be for a route when redistributed into an autonomous system? |
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Definition
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The seed metric should be set to a seed metric larger than the largest metric in the receiving autonomous system. This will help prevent suboptimal routing and routing loops.
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Term
| Which routing protocols have a default seed metric of infinity, making them unreachable when redistributed? |
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Definition
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RIP, IGRP, and EIGRP have unreachable default seed metrics. This means that a seed metric must be manually configured for the routes to be redistributed into an autonomous system.
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Term
| What is the default seed metric for an OSPF redistributed route? |
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Definition
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For OSPF, a redistributed route has the default seed metric of 20 (E2), except for BGP routes. BGP routes have a default type E2 metric of 1.
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Term
| What is the default seed metric for an IS-IS redistributed route? |
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Definition
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An IS-IS redistributed route has the default seed metric of 0.
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Term
| What are the 2 different methods of route redistribution? |
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Definition
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- One-way redistribution - Passes a default route into one routing protocol and redistributed only the networks learned from that routing protocol into the other routing protocol. - Two-way redistribution - Redistributes all routes between both routing protocols.
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Term
| What command is used to limit the number of prefixes that are redistributed into OSPF? |
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Definition
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redistribute maximum-prefix [maximum] [threshold] [warning-only]
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Term
| What command is used to redistribute routes into OSPF? |
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Definition
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redistribute protocol [process-id] [metric value] [metric-type type] [route-map tag] [subnets]
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Term
| What command is used to resitribute routes into RIP? |
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Definition
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redistribute protocol [process-id] [metric value] [metric-type type] [route-map tag]
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Term
| What command is used to redistribute routes in EIGRP? |
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Definition
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redistribute protocol [process-id] [metric value] [metric-type type] [route-map tag]
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Term
| What command is used to redistribute routes into IS-IS? |
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Definition
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redistribute protocol [process-id] [level level-value] [metric value] [metric-type type] [route-map tag]
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Term
| What is the default level type and metric when reoutes are redistributed into IS-iS? |
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Definition
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By default, routes are introduced into IS-IS as level 2 and with a metric of 0
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Term
| What's the difference when setting the default metric with either the default-metric command or by setting it through the redistribute command? |
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Definition
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With the default-metric command, the default value specified applies to the redistributed routes for all routing protocols, whereas with the redistribute command, it only appies to the protocol specified.
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Term
| What command prevents a routing protocol's routing updates from being sent through the specified router interface? |
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Definition
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passive-interface type-number [default]
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Term
| Distribution lists allow updates to be filterd based on what factors? |
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Definition
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- Incoming interface - Outcoing interface - Redistribution from another routing protocol
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Term
| What command is used to filter routing updates that are going out of an interface? |
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Definition
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distribute-list {acl-number | acl_name} out [interface-name | routing_process [routing-process-parameter]]
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Term
| What command is used to filter routing updates coming in through an interface? |
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Definition
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distribute-list {acl-number | acl_name} [route-map route-tag] in [interface-type interface-number]
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Term
| What type of routing updates cannot be filtered out of an interface? |
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Definition
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OSPF outgoing updates cannot be filtered out of an interface.
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Term
| What command is used to create or modify a route map? |
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Definition
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route-map map-tag [permit | deny] [sequence-number]
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Term
| What router configuration command is used to modify the administrative distance of redistributed routes? |
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Definition
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distance administrative-distance [address wilcard-mask [ip-standard-list] [ip-extended-list]]
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Term
| What command is used to modify the administrative distance of routes be redistributed into EIGRP? |
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Definition
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distance eigrp internal-distance external-distance
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Term
| What command is used to modify the administrative distance of route redistributed to OSPF? |
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Definition
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distance ospf {[intra-area dist1] [inter-area dist2] [external dist3]}
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