what is routing redistribution????

[axus123456]

Hello every one,

what is routing redistribution, for what we use it, why we use it and what it do???

i have seen this commandes on EIGRP configuration

redistribute connected metric *** *** *** *** **** route-map EIGRP_CONNECTED_OUT

redistribute connected metric *** *** *** *** **** route-map EIGRP_STATIC_OUT

as * is numbers

and also what below command do?

address-family ipv4 vrf secure

thanks

[kcnajaf · Accepted solution]

Hi Ala,

The use of a routing protocol to advertise routes that are learned by some other means, such as by another routing protocol, static routes, or directly connected routes, is called redistribution. Redistribution is often required when multiple routing protocol is used on a single device.

Redistribution is required to ensure that all routing protocol is aware of the networks learned by other routing protocols

On your above redistribution statement each set of ***** are the 5 EIGRP metric used during redistribution.

The formulae for calculating EIGRP metric is:

Metric = 256*((K1*Bw) + (K2*Bw)/(256-Load) + (K3*Delay)*(K5/(Reliability + K4)))

k1=bandwidth

k2=load

k3=delay

k4=reliability

k5=MTU

As far as i'm aware address-family ipv4 vrf secure is used to define a ipv4 version of VRF instance named as secure.

Regards

Najaf

Please rate when applicable or helpful !!!

[axus123456]

so basicly thats mean redistribute is used to advertise the routing information on a router to other routers on the same network,

[cadet alain · Accepted solution]

Hi,

You have 2 ways of advertising a prefix directly connected on your L3 device within an IGP: using a network command( which will  enable the IGP process on the corresponding interfaces and as a side effect advertise the corresponding prefix) or  redistribute connected interfaces( redistribute connected). By default all connected interfaces will be redistributed so here we can use a route-map to specify which connected prefixes to redistribute and also set them a particular metric.

Regards.

Alain

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