distribution OSPF

Unanswered Question
Jan 8th, 2008

what kind of route it will be if i will use redistribute command under ospf and what kind of route it will be if i will use distribute list with route map? will it be external or internal?

I have this problem too.
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royalblues Tue, 01/08/2008 - 13:01

When you redistribute into OSPF, the routes are tagged as "External" either type 1 or type 2 default being type 2

Distribute list in OSPF is used for controlling prefixes from being entered into the routing table and not for redistribution

HTH

Narayan

guruprasadr Tue, 01/08/2008 - 20:30

HI, [Do Rate all HELPFUL POSTS]

Refer link below for distribute list with route-map:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s24/routmap.htm

Using Distribute List with Route-Map statements, will be useful to define a Route-Map to prevent OSPF Routes from being added to the Routing Table.

Refer link below for Eg: OSPF Router redistributing the other Protocols:

http://www.cisco.com/warp/public/105/redist.html#ospf

Do RATE ALL HELPUL POSTS

Best Regards,

Guru Prasad R

Jon Marshall Tue, 01/08/2008 - 13:03

Hi

Routes redistributed into your OSPF process will always be external routes, either type 1 or type 2.

Type 1 = Cost of external route as advertised into the OSPF AS + the internal cost within the OSPF AS.

Type 2 = Just the cost of the external route as advertised into the OSPF AS.

By default the type is 2 but you can change this when you redistribute using the "metric" option.

They would still be external whether you use a distribute list/route-map or not.

Jon

marikakis Tue, 01/08/2008 - 13:15

Hello,

"Redistributing routes into OSPF from other routing protocols or from static will cause these routes to become OSPF external routes."

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.shtml#t32

Distribute-list out: works on originating ASBR, does not let the externals of this ASBR to be flooded in the network towards other OSPF routers

Distribute-list in: does not let incoming LSA's make it to the routing table

http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094704.shtml#q12

Kind Regards,

M.

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