topology generator: Missing IPs for multiple BRs in a single AS #3318
Description
When there are multiple BRs in a single AS, the docker-compose dispatcher entry contains an IP address for just one of them:
scion_disp_br_1-ff00_0_111:
container_name: scion_disp_br_1-ff00_0_111
environment:
SU_EXEC_USERSPEC: $LOGNAME
image: scion_dispatcher_go
networks:
scn_002:
ipv4_address: 242.254.0.34
volumes:
...
Caused by this code in topology generator (in python/topology/docker.py):
# Create dispatcher for BR Ctrl Port
for k in topo.get("BorderRouters", {}):
if k.endswith('-1'):
ctrl_net = self.elem_networks[k + "_ctrl"][0]
ctrl_ip = str(ctrl_net['ipv4'])
break
entry['networks'][self.bridges[ctrl_net['net']]] = {'ipv4_address': ctrl_ip}
Consequently, no BRs except for instance 1 are getting any ctrl-plane packets.