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konradkreciwilk
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Posts: 1
Joined: Tue Feb 14, 2023 7:28 pm

LSSA-LSA forwarding-address

Tue Feb 14, 2023 7:44 pm

Hello,

I have configuration
R1 --- R2
vlan10 \ / vlan20
R3

R3 (NSSA, area 3):
vlan10 (ospf interface): 10.81.0.1/30
vlan20 (ospf interface): 10.81.0.5/30
loopback (router-id, passive ospf interface): 10.81.254.3/32

vlan100 (normal interface): 100.64.0.0/24

where R3 type NSSA and redistrubute-connected interfaces. I would like achieve configuration that mikrotik use loopback addres for LSSA-LSA forwarding-address. Currently I have:
LSA for ID 100.64.0.0:

options=NP
netmask=255.255.255.0
forwarding-address=10.81.0.1
metric=1 type-1
route-tag=0

I have another setup, which is configured the same and I have always forwarding-address=loopback-address/32. I don't know why that works fine.
How does the forward-address selection for NSSA-LSA look like?

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