OSPFv3 : Setting Administrative Distance

Unanswered Question
Jan 16th, 2009
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Hello,


Going for an IPV6 lab where multiple points of redistributions between RIPng and OSPFv3 exist, I was looking for a command to manipulate administrative distance in order to prevent sub-optimal routing, as I usually do IPv4.


In IPV4 we have this command :

router ospf 1

distance administrative_distance address wildcard-mask} [access-list-number | name]


This permit to put a higher administrative distance for certain routes.


In OSPFv3 or RIPng I can only set the default administrative distance for the whole routing process but not for certaint routes.


As route-map cannot be used for administrative distance. How, in IPv6 can I change administrative distance for certains routes ?


Thanks for your answer

morgan


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Giuseppe Larosa Fri, 01/16/2009 - 05:22
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Hello Morgan,

see if this other version of distance command is supported:


http://www.cisco.com/en/US/docs/ios/ipv6/command/reference/ipv6_04.html#wp2025293


distance [ospf {external | inter-area | intra-area}] distance


with this you change the distance for each OSPF route type.


this can be a workaround.


an alternate way is to filter on the redistribution using a route-map to block the non -optimal route


Hope to help

Giuseppe


ccr_cisco Fri, 01/16/2009 - 05:29
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Hello Giuseppe,


Thanks for your quick reply.


Yes this other distance syntax is available, and this is the workaround I used.


So it's seems that in IPv6 there is no way to set distance for individual routes ????


Filtering at redistribution is not an option in order to keep redundancy.


Regards

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