OSPF protocol and export filters for E2 routes
Nigel Kukard
nkukard at LBSD.net
Wed Dec 9 18:48:18 CET 2020
Hi guys,
I'm wondering if someone knows the answer to this, here is the setup...
R1 => R2 => R3
- R1 advertises a route (in this case 0.0.0.0/0) to R2 (from static or
kernel)
- R2 accepts the route with "import all"
- R2 has a filter for the route with "export my_filter;" and in that
filter there is a "reject;"
- R3 should not receive the route, correct?
What I am seeing is this works 100% as expected in RIP.
When I try the same thing with OSPF, I am not seeing it being rejected
on R2. Infact, I am not seeing the E2 route at all pass through the
export filter. But I am receiving it on R3.
I just want to make sure this is expected or unexpected behavior?
My use case is if R1 advertises a default route via OSPF, I was looking
at filtering that default route out on R2 so it is not advertised to R3.
-N
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