OSPF between Juniper and Mikrotik - unable to ping loopback from Juniper

RouterOS Forwarding Protocols
1

Hi all, please see diagram below:
OSPF forum help request2.png
I’m trying to get BGP and OSPF working between a Juniper SRX (packet mode) and the rest of our network. This is just a small part of what we have planned but I’ve broke it down into a small chunk.

Here’s the Juniper’s OSPF config:

# show routing-options router-id                              
router-id 3.3.3.32;

# show protocols ospf
area 0.0.0.0 {
area 0.0.0.0 {
    interface lo0.0;
    interface ge-0/0/14.0;
    }
}

And the Mikrotik’s OSPF:

[admin@HillheadFauxNAS1] >
> routing ospf export
/routing ospf instance
set [ find default=yes ] router-id=3.3.3.34
/routing ospf interface
add interface=lo0
/routing ospf network
add area=backbone network=172.16.1.24/30

> interface bridge export 
/interface bridge
add admin-mac=01:00:00:00:01:00 auto-mac=no name=lo0

Here’s the Juniper’s OSPF status:

> show ospf database    
    OSPF database, Area 0.0.0.0
 Type       ID               Adv Rtr           Seq      Age  Opt  Cksum  Len 
Router  *3.3.3.32         3.3.3.32         0x8000000e   221  0x22 0xd715  48
Router   3.3.3.34         3.3.3.34         0x8000000b   410  0x2  0x69d1  36
Network *172.16.1.25      3.3.3.32         0x80000007  2007  0x22 0xc022  32

> show ospf neighbor    
Address          Interface              State     ID               Pri  Dead
172.16.1.26      ge-0/0/14.0            Full      3.3.3.34           1    29

And the MTik’s status:

> routing ospf neighbor pr
 0 instance=default router-id=3.3.3.32 address=172.16.1.25 interface=ether1 priority=128 dr-address=172.16.1.25 backup-dr-address=172.16.1.26 state="Full" state-changes=6 
   ls-retransmits=0 ls-requests=0 db-summaries=0 adjacency=4h38m42s 

ip route pr             
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit 
 #      DST-ADDRESS        PREF-SRC        GATEWAY            DISTANCE
 0 ADo  3.3.3.32/32                        172.16.1.25             110
 1 ADC  3.3.3.34/32        3.3.3.34        lo0                       0
 2 ADC  172.16.1.24/30     172.16.1.26     ether1                    0
 3  DC  192.168.88.0/24    192.168.88.1    ether10                 255

I’m not sure if this is quite correct. I can ping the SRX’s loopback address from the Mikrotik but not the reverse. From the SRX I get:

> ping 3.3.3.34         
PING 3.3.3.34 (3.3.3.34): 56 data bytes
ping: sendto: No route to host

Seems like I’m missing something fundamental on the SRX. Can anyone help?

Many thanks for reading

NTB

2

The Mikrotik isn’t set to advertise its loopback interface.

Add network=3.3.3.34/32 area=backbone

Adding interface=loopback0 doesn’t do what you think - it doesn’t set the interface into an area. It defines the interface parameters such as cost, network type, hello interval, etc.

3

Brilliant, thanks.

The SRX can now ping the Mikrotik. That’s one tiny bit of the jigsaw solved. Many thanks,

NTB