[c-nsp] OSPF routing question

[Gert Doering]

Hi,

On Wed, Jul 18, 2018 at 02:57:37AM +0000, Erik Sundberg wrote:
> Change the Floating static route to an administrative distance of 254, so it is higher than OSPF.
> 
> 
> router static
>  address-family ipv4 unicast
>  45.x.x.0/22 Null0 254
> 
> 
> When the route is learned via OSPF it will have a metric of 110 and the ospf route will be installed into the routing table.
> 
> When the route is not learned via OSPF the floating static router on your Edge router will be active. This will still allow BGP to advertise the route.

If you do this, be aware that every OSPF come-and-go is very likely to lead 
to a churn in BGP, as metrics change.  This might or might not be a problem,
but everything that leads to externally visible BGP updates should be
considered well.

gert
-- 
"If was one thing all people took for granted, was conviction that if you 
 feed honest figures into a computer, honest figures come out. Never doubted 
 it myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             gert at greenie.muc.de
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