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Redistrubiting of static routes versus kernel routes

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dtoman at fortech

Oct 7, 2010, 5:01 AM

Post #1 of 4 (1675 views)
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Redistrubiting of static routes versus kernel routes

Hi,

On our linux boxes I use static routes in Zebra daemon to define IP
blocks we want to send to outside using OSPF. On each linux then the
larger IP blocks are heavily fragmented (routed as /30 usually).
So I have for example following definition

1.2.3.0/24 Null0

in zebra

and

1.2.3.0/30 via x.y
1.2.3.4/30 via x.z
...

It works fine. Zebra creates a /24 blackhole and kernel has the /24
fragmented into smaller subnets. OSPF redistributes static and
connected (but no kernel) routes so it redistributes 1.2.3.0/24.

But on one server I have a situation where the static route and the
kernel one have equal bitmask. OSPF in this case doesn't announce the
subnet to OSPF neighbor.

For example:
sh ip route 10.0.0.0
Routing entry for 10.0.0.0/22
Known via "static", distance 1, metric 0, blackhole
directly connected, Null0

Routing entry for 10.0.0.0/22
Known via "kernel", distance 0, metric 0, best
* x.y.x.y, via eth1

Is there an easy way how to configure quagga to redistribute
10.0.0.0/22 in such a case?

Regards
D. Toman

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craig.miskell at opus

Oct 7, 2010, 12:29 PM

Post #2 of 4 (1608 views)
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Re: Redistrubiting of static routes versus kernel routes [In reply to]

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Dalibor Toman wrote:
> Hi,
> But on one server I have a situation where the static route and the
> kernel one have equal bitmask. OSPF in this case doesn't announce the
> subnet to OSPF neighbor.
>
> For example:
> sh ip route 10.0.0.0
> Routing entry for 10.0.0.0/22
> Known via "static", distance 1, metric 0, blackhole
> directly connected, Null0
>
> Routing entry for 10.0.0.0/22
> Known via "kernel", distance 0, metric 0, best
> * x.y.x.y, via eth1
>
> Is there an easy way how to configure quagga to redistribute 10.0.0.0/22
> in such a case?
Is there any reason you can't tell OSPF to redistribute the kernel routes:
router ospf
redistribute kernel

on the server that needs it. It's not a great solution, but it might be what
you're after in this case.

- --
Craig Miskell
Senior Systems Administrator
Opus International Consultants
Phone: +64 4 471 7209
"Criticizing a man for not holding political office is like criticizing a
dog for not humping your leg. Both have the ability to do the deed but the
superior ones choose not to."
-- ronniecat, in rec.arts.comics.strips
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dtoman at fortech

Oct 12, 2010, 10:33 AM

Post #3 of 4 (1607 views)
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Re: Redistrubiting of static routes versus kernel routes [In reply to]

On Thursday, October 07, 2010 9:29 PM ,
Craig Miskell <craig.miskell [at] opus> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Dalibor Toman wrote:
>> Hi,
>> But on one server I have a situation where the static route and the
>> kernel one have equal bitmask. OSPF in this case doesn't announce
>> the
>> subnet to OSPF neighbor.
>>
>> For example:
>> sh ip route 10.0.0.0
>> Routing entry for 10.0.0.0/22
>> Known via "static", distance 1, metric 0, blackhole
>> directly connected, Null0
>>
>> Routing entry for 10.0.0.0/22
>> Known via "kernel", distance 0, metric 0, best
>> * x.y.x.y, via eth1
>>
>> Is there an easy way how to configure quagga to redistribute
>> 10.0.0.0/22 in such a case?
> Is there any reason you can't tell OSPF to redistribute the kernel
> routes: router ospf
> redistribute kernel
>
> on the server that needs it. It's not a great solution, but it
> might
> be what you're after in this case.
>

there is more than 1100 /30 and /29 (and there are larger subnets
too) routes on the Linux box and I don't want to export them to OSPF
ouside this area.

And I saw several notes on WWW that redistributing kernel routes in
quagga is a bad idea..

Regars
Dalibor Toman

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quagga-users at alexis

Oct 12, 2010, 3:46 PM

Post #4 of 4 (1606 views)
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Re: Redistrubiting of static routes versus kernel routes [In reply to]

It's fine if you're careful to filter them. Use a prefix-list and specify exactly which routes you want.

/a

On Oct 12, 2010, at 1:33 PM, Dalibor Toman wrote:
> Craig Miskell <craig.miskell [at] opus> wrote:
>> Dalibor Toman wrote:
>>> But on one server I have a situation where the static route and the
>>> kernel one have equal bitmask. OSPF in this case doesn't announce the
>>> subnet to OSPF neighbor.
>>>
>>> For example:
>>> sh ip route 10.0.0.0
>>> Routing entry for 10.0.0.0/22
>>> Known via "static", distance 1, metric 0, blackhole
>>> directly connected, Null0
>>>
>>> Routing entry for 10.0.0.0/22
>>> Known via "kernel", distance 0, metric 0, best
>>> * x.y.x.y, via eth1
>>>
>>> Is there an easy way how to configure quagga to redistribute
>>> 10.0.0.0/22 in such a case?
>> Is there any reason you can't tell OSPF to redistribute the kernel
>> routes: router ospf
>> redistribute kernel
>>
>> on the server that needs it. It's not a great solution, but it might
>> be what you're after in this case.
>
> there is more than 1100 /30 and /29 (and there are larger subnets
> too) routes on the Linux box and I don't want to export them to OSPF
> ouside this area.
>
> And I saw several notes on WWW that redistributing kernel routes in
> quagga is a bad idea..

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