BSCI – Manipulate Routes Pt.1
In which direction is route redistribution always performed?
Route redistribution is always performed outbound, which means that the router doing the redistribution never changes its own routing table.
What must be in a router’s routing table for it to redistribute specific routes?
Routes must be in a router’s routing table for them to be redistrubuted.

What command is used to set the seed metric for all redistributed routes?

default-metric metric-value
What should the seed metric be for a route when redistributed into an autonomous system?
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.
Which routing protocols have a default seed metric of infinity, making them unreachable when redistributed?
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.
What is the default seed metric for an OSPF redistributed route?
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.
What is the default seed metric for an IS-IS redistributed route?
An IS-IS redistributed route has the default seed metric of 0.
What are the 2 different methods of route redistribution?

– 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.

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– Two-way redistribution – Redistributes all routes between both routing protocols. 

What command is used to limit the number of prefixes that are redistributed into  OSPF?
redistribute maximum-prefix [maximum] [threshold] [warning-only]
What command is used to redistribute routes into OSPF?
redistribute protocol [process-id] [metric value] [metric-type type] [route-map tag] [subnets]
What command is used to resitribute routes into RIP?
redistribute protocol [process-id] [metric value] [metric-type type] [route-map tag]
What command is used to redistribute routes in EIGRP?
redistribute protocol [process-id] [metric value] [metric-type type] [route-map tag]
What command is used to redistribute routes into IS-IS?
redistribute protocol [process-id] [level level-value] [metric value] [metric-type type] [route-map tag]
What is the default level type and metric when reoutes are redistributed into IS-iS?
By default, routes are introduced into IS-IS as level 2 and with a metric of 0
What’s the difference when setting the default metric with either the default-metric command or by setting it through the redistribute command?
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.
What command prevents a routing protocol’s routing updates from being sent through the specified router interface?
passive-interface type-number [default]
Distribution lists allow updates to be filterd based on what factors?

– Incoming interface

 

– Outcoing interface

 

– Redistribution from another routing protocol 

What command is used to filter routing updates that are going out of an interface?
distribute-list {acl-number | acl_name}  out [interface-name | routing_process [routing-process-parameter]]
What command is used to filter routing updates coming in through an interface?
distribute-list {acl-number | acl_name} [route-map route-tag] in [interface-type interface-number]
What type of routing updates cannot be filtered out of an interface?
OSPF outgoing updates cannot be filtered out of an interface.
What command is used to create or modify a route map?
route-map map-tag [permit | deny] [sequence-number]
What router configuration command is used to modify the administrative distance of redistributed routes?
distance administrative-distance [address wilcard-mask [ip-standard-list] [ip-extended-list]]
What command is used to modify the administrative distance of routes be redistributed into EIGRP?
distance eigrp internal-distance external-distance
What command is used to modify the administrative distance of route redistributed to OSPF?
distance ospf {[intra-area dist1] [inter-area dist2] [external dist3]}
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