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christian178
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Posts: 42
Joined: Fri Sep 25, 2020 4:26 pm

MPLS accept/advertised filter

Thu Mar 09, 2023 2:27 pm

Hi there,

i have read the MPLS LDP help Pages
https://help.mikrotik.com/docs/display/ ... getreemode

but i don't understand it exactly. :-)
MPLS and LDP is clear, but advertised and accept-Filter not currently.

There are:
Let's consider that we have already existing four routers setup, with working IP connectivity.
   (lo:111.111.111.1)            (lo:111.111.111.2)            (lo:111.111.111.3)                     (lo:111.111.111.4)
|---------R1-----(111.11.0.0/24)-----R2-----(111.12.0.0/24)-----R3-----(111.13.0.0/24)-----R4---------|
and then:
In the given example setup all routers can be configured so that they advertise labels only for routes that allow reaching the endpoints of tunnels. For this 2 advertise filters need to be configured on all routers:
/mpls ldp advertise-filter add prefix=111.111.111.0/24 advertise=yes
/mpls ldp advertise-filter add prefix=0.0.0.0/0 advertise=no
ok. this works, whean all loopback-Adresses in an /24

But my setup is:
Let's consider that we have already existing four routers setup, with work ing IP connectivity.
   (lo:10.20.1.1)                     (lo:10.13.11.1)                (lo:10.14.12.1)                        (lo:10.1.1.1)
|---------R1-----(111.11.0.0/30)-----R2-----(111.12.0.0/30)-----R3-----(111.13.0.0/30)-----R4---------|
so there are an VPLS Interface between R1 and R4 (no vpls other)

Must every Router advertised his own loopback-address and all other router loopback-adresses or only his own?
Must i advertised on evry router all transport /30 Adresses?
What must i accept on the routers?

thanks
Christian

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