bgp filters. prefixes in filters and bgp prepend

RouterOS General
1

hi

i have multiple bgp peers. i want to place every peers prefixes in their own chains.

for example i have 2 peers A and B

i want to place peers A an B prefixes in chains chain-A and chain-B. my prefixes in chain-Y.
every “prefix” chain will have return action at the end.

if i place:

action=jump jump-target=chain-A set-bgp-prepend=5

will it be applied to every rule in chain-A ?

2

it will either be applied to every route that passed to this rule, or won’t be appliesd at all. I vote first :slight_smile:

what exactly do you want to do?

3

it is applied to every rule in jump-target chain. confirmed.

i wan to store peers prefixes in one chain. thus i will not have to update every peers chain if a prefix changes.

4

you mean, chains of filters, or routing tables?.. for the latter use

action=accept set-routing-mark=bla-blA

if not - please explain with an example :slight_smile:

5 
add action=jump chain=bgp-provider-in jump-target=PROVIDER-PREFIX set-bgp-prepend=6
add action=discard chain=bgp-provider-in

add action=accept chain=PROVIDER-PREFIX prefix=x.x.x.x
add action=accept chain=PROVIDER-PREFIX prefix=x.x.x.x
add action=return chain=PROVIDER-PREFIX

this will result in setting bgp prepend to 6 for every prefix listed in PROVIDER-PREFIX chain.

6

you mean, it’s the solution?

what chain is used in BGP Peer?

7

yes

bgp-provider-in (the same as specified in peer configuration)