Routing

Hello Team,

         I am completely new in the JunOS world and I am having a stroke understanding some stuff. maybe someone here could help. 

I currently have a Cisco router running some Loopbacks which are being monitored by some IP SLAs. These IP SLAs trigger some Event managers that will perform some config changes automatically. 

So in case the Loopbacks change their state, the IP SLA will trigger the Event manager and perform the config changes required. 

Now the question. How do I do the same stuff in juniper? (Lol)

I've been looking through official docs and books and noticed that several loopbacks cannot be set in the Router as with Cisco, I used the logical numbers. However. When attempting to assign an IP to the loopbacks. the system throws an error and doesnt allow me. 

Ok. I set a routing instance and added the Lo0.0 with Ip 1.1.1.1/24 to it. However. When adding the second (Lo0.2 (IP 2.2.2.2)) to the configuration. I get this error:

'unit 2'
if_instance: Multiple loopback interfaces not permitted in master routing instance

Due to design issues. I cannot set multiple IPs in the same Loopback. 

Any help is appreciated.

thanks

Hi,

You can add multiple IP addresses under single lo0.0 interface.  You can set one of them as Primary address.

Please see below:

http://www.juniper.net/documentation/en_US/junos12.3/topics/usage-guidelines/interfaces-configuring-the-loopback-interface.html

Regards

Surya

Hi,

Since multiple loopback interfaces are not allowed in an RI, one possibility could be to have the logical lo0 units in different RIs and use rib-groups to import the interface routes in inet.0 for the IPSLA reachability. Example:

root@mx# show routing-options 
rib-groups {
    test {
        import-rib [ LO1.inet.0 inet.0 ];
    }
    test2 {
        import-rib [ LO2.inet.0 inet.0 ];
    }
}

[edit]
root@mx# show routing-instances LO1 
instance-type virtual-router;
interface lo0.1;
routing-options {
    interface-routes {
        rib-group inet test;
    }
}

[edit]
root@mx# show routing-instances LO2    
instance-type virtual-router;
interface lo0.2;
routing-options {
    interface-routes {
        rib-group inet test2;
    }
}

root@mx# run show route protocol direct

inet.0: 3 destinations, 3 routes (3 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

192.168.0.100/32 *[Direct/0] 00:12:00
 > via lo0.0
192.168.1.100/32 *[Direct/0] 00:10:04
 > via lo0.1
192.168.2.100/32 *[Direct/0] 00:09:00
 > via lo0.2

Cheers,

Ashvin

AshvinO,

Sounds like a good implementation. So. At the end. I will need to set an individual Routing-instance per Lo0. I will give it a try in my lab today and let you know how it goes. 

Thanks for the help

 AshvinO,

Quick question. IN order to have communication between the LOs I guess that a RP must be set right? Or they should ping themselves without any RP?

Thanks

Please disregard the previous question. It was dumb i figured it out