From: Paul Cosgrove (paul.cosgrove@heanet.ie)
Date: Tue Jan 15 2008 - 07:45:06 ARST
You were correct Nate,
On an ABR it is not dependedent on any route in the routing table, just
the connection to area 0. The command can also be used on an ASBR, but
if it is then an existing route has to be in place. So on ABSRs it
would be affected by a learned default route being removed.
Paul.
Paul Cosgrove wrote:
> The command does not require a default route to be in the routing table
> and so there is no need to have the 'always' option. NSSA areas do not
> have a 0.0.0.0/0 route injected from area 0 by default, but this command
> can be used to inject one on an ABR.
>
> Except for the directly connected interface in area 0, the command has
> no dependency on other routes. If the only area 0 interface fails then
> the router ceases to be an ABR and the default route will be withdrawn.
>
> Paul.
>
> Cielieska Nathan wrote:
>> All,
>>
>> I was doing some labs today and could not find a place to do a default
>> route into OSPF (NSSA area) with the always option.
>>
>> NSSA ASBR
>> area 1 nssa default-information-originate has no "always" keyword
>>
>> STANDARD ASBR
>> default-information originate always
>>
>> Is it a correct assumption that only Type-5 default routes can be kept
>> in the routing table in the instance of a flapping default route on an
>> "upstream" router but Type-7's (or routers in an NSSA) cannot keep a
>> default route in case of a flapping default route?
>>
>> Regards,
>> Nate
>>
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