bgp re-distribution

Answered Question
Mar 13th, 2009
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Hi,


Does the re-distribution change the "administrative distance" to 100?


rdgs


R1

router ospf 10

redistribute bgp 65530 subnets route-map BGP-TO-OSPF

network 172.16.1.0 0.0.255.255 area 0

!

router bgp 65510

nei 192.168.10.1 remote-as 65520

!

!

!

route-map BGP-TO-OSPF permit 25

set metric 100

!

!

Correct Answer by lamav about 8 years 2 weeks ago

Anita:


Just to add a bit to what Jon and Giuseppe said, a metric is a concept in routing protocols that is used to measure the desirability of a particular route. It is a general term that measures the "cost" of a route. In OSPF, the lower the metric, the lower the cost, the more desirable the route it is. OSPF uses bandwidth and a ratio to determine the numerical metric of a route.


In eigrp, the metric used to determine desirability of a route is derived from the bandwidth and delay between the router and the destination network. The metric is a numerical result of a mathematical equation.


You need to do some reading on routing protocols, as your question speaks to the very basics.


HTH


Victor



Correct Answer by Giuseppe Larosa about 8 years 2 weeks ago

Hello Anita,

yes the route-map sets the seed metric for OSPF: the redistributed routes will be seen as O E2 routes with metric 100


to be noted that because no match command is present all BGP routes are redistributed.


the subnets keyword is necessary or OSPF will accept only major networks (A,B, C)


Hope to help

Giuseppe


Correct Answer by Jon Marshall about 8 years 2 weeks ago

Anita


No it does't change the administrative distance. What it does is set the metric of each route that is redistributed to 100.


Jon

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Correct Answer
Jon Marshall Sat, 03/14/2009 - 01:10
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Anita


No it does't change the administrative distance. What it does is set the metric of each route that is redistributed to 100.


Jon

Correct Answer
Giuseppe Larosa Sat, 03/14/2009 - 06:24
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Hello Anita,

yes the route-map sets the seed metric for OSPF: the redistributed routes will be seen as O E2 routes with metric 100


to be noted that because no match command is present all BGP routes are redistributed.


the subnets keyword is necessary or OSPF will accept only major networks (A,B, C)


Hope to help

Giuseppe


Correct Answer
lamav Sat, 03/14/2009 - 10:15
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  • Blue, 1500 points or more

Anita:


Just to add a bit to what Jon and Giuseppe said, a metric is a concept in routing protocols that is used to measure the desirability of a particular route. It is a general term that measures the "cost" of a route. In OSPF, the lower the metric, the lower the cost, the more desirable the route it is. OSPF uses bandwidth and a ratio to determine the numerical metric of a route.


In eigrp, the metric used to determine desirability of a route is derived from the bandwidth and delay between the router and the destination network. The metric is a numerical result of a mathematical equation.


You need to do some reading on routing protocols, as your question speaks to the very basics.


HTH


Victor



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