simple_bgp_community_prepend_as.py

from ipmininet.router.config import BGP, CommunityList
from ipmininet.router.config.zebra import RouteMapSetAction
from simple_bgp_network import SimpleBGPTopo


class PrependASTopo(SimpleBGPTopo):

    def create_community_lists(self):
        community_list = CommunityList(
            'prepend-as-list', community='2:90')

        return [community_list]

    def set_route_maps_for_community(self, community_list, as1r1, as2r1, as2r2, as3r1):
        for route_map_name in ['as3r1-ipv4-out', 'as3r1-ipv6-out']:
            as2r2.get_config(BGP).add_set_action(
                name=route_map_name,
                direction='out',
                peer=as3r1,
                matching=(community_list,),
                set_action=RouteMapSetAction(
                    'comm-list',
                    f'{community_list.name} delete'
                )
            )
            as2r2.get_config(BGP).add_set_action(
                name=route_map_name,
                direction='out',
                peer=as3r1,
                matching=(community_list,),
                set_action=RouteMapSetAction(
                    'as-path',
                    'prepend 2'
                )
            )