Routing

Hi,

 

Is there any equivalent interface in Juniper for Cisco's Null0 ? or We need to acheive that functionality with policy only ?

Hi,

If you want to install a route in routing table even you don't have a next-hop you can use discard keyword ,

for example : 

 

[edit]

Router# set routing-options static route A.B.C.D/M discard 

 

Best Regards

kdoumal 

Hi, 

 

I would like to restrict some routes going out of my ABR router. Is it possible ?

 

For example,

 

In area 0, I have 10 routes. And these ten routes are going into area 1 as LSA1 routes.

 

So, on a router in Area 1, i will see all the 10 routes from area 0 as LSA1.

 

Now, I want only 4 LSA's out of 10 LSA's to be seen in routers in area 1.

 

How to achieve this. Do I need to add some configuration on the ABR router or router in area1.

 

For now, i have only one router in area1. ABR is part of area0 and area1.

 

Probably better to post this as its own thread, rather than adding to a years-old thread on an unrelated topic. Anyway, you have some incorrect information here. Type 1 LSAs don't go from area to area; this information gets summarised in Type 3 LSAs instead. You can use import and export filters on your ABR to control what information will get passed from area to area.

I think the only way to control external routes flowing from the backbone into area 1 is to make area 1 a stub area and inject a default route in it. If the external routes were in area 1 then you could use the area-range restrict statement.

To expand on that a little, there is also the equivalent discard interface that you can apply a filter to if you are interested in what is going to your null0/discard interface: 

 

interfaces {

    dsc {

        unit 0 {

            family inet {

                filter {

                    output discards-out;

                }

            }

        }

    }

}

firewall {

    family inet {

        filter discards-out {

            term discard-all {

                then {

                    count discarded;

                    log;

                    discard;

                }

            }

        }

    }

}