[j-nsp] Routing-instances

[Christian Koch]

That's what I assumed..thanks for your help guys..

Heres another ques..

I had an issue today I'll explain briefly

A customer had t3 and t1..t3 was to be preferred and t1 I set a metric
of 220 on in case the t3 fails.. (these are on2  diff routers, t3 is on
the juniper and t1 on the cisco)

Static route for t3 on juniper..but traffic was preferring the t1
still..

Then I found the routing instance statement at the end of the config,
but it did look like it was complete

}
routing-instances {
    routing-instances {
        interface t3-5/1/1.0;
    }
}
Now, any clue as why the traffic was preferring the t1 link?

Was it because the routing instance was not configured correctly? (I do
not know who added it or why it was..)

Thanks!



 

-----Original Message-----
From: Leigh Porter [mailto:leigh.porter at ukbroadband.com] 
Sent: Wednesday, September 20, 2006 10:46 AM
To: Erdem Sener
Cc: Christian Koch; juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Routing-instances


They are also used for filter based forwarding.
i.e.

You match packets to port 80 and have a routing instance with a default
route pointing to your transparent WWW cache, when the filter sees a
datagram matching your filter instead of using the normal inet.0 routing
table you can tell it to use a different routing table to select a route
from for that datagram.

Or say you have two upstream ISP connections, you can decide what ISP to
send traffic to based on a filter and have each ISP with a different
routing instance, I think this is the example used in the Juniper docs.

Juniper routing instances can have their own routing protocol instances
also, I believe.

--
Leigh


Erdem Sener wrote:
> Hello,
>
>  Well, basically the routing-instances are routing tables besides the 
> default inet.x and might be used for things like source-based routing,

> MPLS/VPLS configuration etc.
>
>  By configuring a routing-instance you might be defining a VRF table, 
> a VPLS domain or just a routing table you can use for source-based 
> routing.
>
> HTH
> --
> Erdem
>
>
>
> On 9/20/06, Christian Koch <ckoch at globix.com> wrote:
>   
>> Can anyone explain to me exactly what "routing-instances" are?
>>
>> Thanks!
>>
>>
>>
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