[j-nsp] About ISIS export policy behavior

[Harry Reynolds]

I always understood export for a link state to apply to external only. Internal routes have to be flooded for correct protocol operation, minus certain rules for L1/L2 or for ospf stubby areas, but filtering these internals is not done with policy. 

In this context the doc link makes sense. 

While a bit surprised it worked, you seems to have overrode the default deny all externals export with an explicit deny all, which also caught internal routes.

HTHs





-----Original Message-----
From: juniper-nsp [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Pyxis LX
Sent: Friday, February 05, 2016 7:35 AM
To: Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk>
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] About ISIS export policy behavior

Hi, Adam.

Thanks for the clarification.

This is really confusing.

-PLX

On 2/1/16, Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk> wrote:
>> Pyxis LX
>> Sent: Sunday, January 31, 2016 8:17 AM
>>
>> Hi, All.
>>
>> I'm a little confused by the default ISIS export behavior in JUNOS.
>>
>> According to this:
>> https://www.juniper.net/documentation/en_US/junos14.1/topics/concept/
>> policy-routing-policies-actions-defaults.html
>>
>> ISIS/OSPF default export policy should "reject everything", which 
>> means it should be equivalent to a policy like this:
>>
>> policy-statement reject-all {
>>     then reject;
>> }
>>
>> However when I apply this export policy to protocol isis, all non-iso 
>> routes, including lo0's inet/inet6 addresses are not advertised in 
>> LSP anymore.
>>
>> Shouldn't these routes be advertised by flooding? Or did I miss 
>> something?
>>
> Yeah, very confusing indeed, "Junos Logic" TM.
>
> adam
>
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