On Wed, Jul 26, 2017 at 12:20:29PM +0100, Israel G. Lugo wrote: > Hello,
> What I need, unless someone has a better suggestion, is some way to
> summarize externals in OSPF, such that the summary prefix is only
> announced if I've got more specific routes inside it.
Hi
> area 0.0.1.2 {
> nssa;
> /* transit VLAN to the tennant routers */
> interface "eth0.22" { stub; check link yes; };
> external {
> 198.18.0.0/15;
> };
> }
>
> >From my understanding, I believe the external keyword on an NSSA would
> be to aggregate in the opposite direction (backbone -> NSSA area).
No, it is used for aggregation in NSSA->backbone direction. But it works
only for NSSA-ext routes received from the NSSA area. If you export
external route to OSPF on ABR, it is always exported directly to
backbone (regardless of its nexthop).
> Is there any way to do what I want? I.e., summarize externals into OSPF,
> if and only if I have specific routes inside the summary prefix? That,
> or a conditional route, that only gets inserted if another certain route
> exists, or if the BGP peering is up.
Not directly, you can use the trick with with recursive route:
http://bird.network.cz/pipermail/bird-users/2017-July/011408.html
--
Elen sila lumenn' omentielvo
Ondrej 'Santiago' Zajicek (email: santi...@crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."
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