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bgp: Added support to indicate the next hop IP address for the BGP module

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If the path has a next hop value set, it should be used in the BGP
Update message first.  This changes to logic to use the check for the
next hop in the order prefix/path->peer config->speaker config.  This
will allow for sending the nexthop as part of the add_prefix message and
allow for overiding the nexthop of the peer if one is set.

Based-on: Alan Quillin <alanquillin@gmail.com>
Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
This commit is contained in:
ISHIDA Wataru 2015-08-21 12:25:59 +09:00 committed by FUJITA Tomonori
parent 1a9008b73e
commit 2a4423fda3
2 changed files with 11 additions and 3 deletions
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7
ryu/services/protocols/bgp/info_base/base.py
View File

@ -809,6 +809,13 @@ class Path(object):
return not interested_rts.isdisjoint(curr_rts)
def is_local(self):
return self._source == None
def has_nexthop(self):
return not (not self._nexthop or self._nexthop == '0.0.0.0' or
self._nexthop == '::')
def __str__(self):
return (
'Path(source: %s, nlri: %s, source ver#: %s, '

7
ryu/services/protocols/bgp/peer.py
View File

@ -851,11 +851,12 @@ class Peer(Source, Sink, NeighborConfListener, Activity):
nlri_list = [path.nlri]
# By default we use BGPS's interface IP with this peer as next_hop.
# TODO(PH): change to use protocol's local address.
# next_hop = self.host_bind_ip
next_hop = self._session_next_hop(path)
if path.is_local() and path.has_nexthop():
next_hop = path.nexthop
# If this is a iBGP peer.
if not self.is_ebgp_peer() and path.source is not None:
if not self.is_ebgp_peer() and not path.is_local():
# If the path came from a bgp peer and not from NC, according
# to RFC 4271 we should not modify next_hop.
# However RFC 4271 allows us to change next_hop