OSPFv3 : Setting Administrative Distance

ccr_cisco · ‎01-16-2009

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

Giuseppe Larosa · ‎01-16-2009

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 · ‎01-16-2009

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