def clone_rtcpath_update_rt_as(path, new_rt_as):
"""Clones given RT NLRI `path`, and updates it with new RT_NLRI AS.
Parameters:
- `path`: (Path) RT_NLRI path
- `new_rt_as`: AS value of cloned paths' RT_NLRI
"""
assert path and new_rt_as
if not path or path.route_family != RF_RTC_UC:
raise ValueError('Expected RT_NLRI path')
old_nlri = path.nlri
new_rt_nlri = RouteTargetMembershipNLRI(new_rt_as, old_nlri.route_target)
return RtcPath(path.source, new_rt_nlri, path.source_version_num,
pattrs=path.pathattr_map, nexthop=path.nexthop,
is_withdraw=path.is_withdraw)
def _add_rt_nlri_for_as(self, rtc_as, route_target, is_withdraw=False):
from ryu.services.protocols.bgp.core import EXPECTED_ORIGIN
rt_nlri = RouteTargetMembershipNLRI(rtc_as, route_target)
# Create a dictionary for path-attrs.
pattrs = OrderedDict()
if not is_withdraw:
# MpReachNlri and/or MpUnReachNlri attribute info. is contained
# in the path. Hence we do not add these attributes here.
pattrs[BGP_ATTR_TYPE_ORIGIN] = BGPPathAttributeOrigin(
EXPECTED_ORIGIN)
pattrs[BGP_ATTR_TYPE_AS_PATH] = BGPPathAttributeAsPath([])
# Create Path instance and initialize appropriately.
path = RtcPath(None, rt_nlri, 0, is_withdraw=is_withdraw,
pattrs=pattrs)
tm = self._core_service.table_manager
tm.learn_path(path)
