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Merge pull request #15899 from gromit1811/ospf6_ecmp_inter_area_bugfix_15777_pr

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ospf6d: Fix nexthop computation for inter-area multi-ABR ECMP
This commit is contained in:
Russ White 2024-05-07 10:48:32 -04:00 committed by GitHub
parent ee853851bd 217e505a67
commit ae01d44596
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GPG key ID: B5690EEEBB952194
10 changed files with 128 additions and 87 deletions
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11
ospf6d/ospf6_abr.c
View file

@ -1275,8 +1275,6 @@ void ospf6_abr_examin_summary(struct ospf6_lsa *lsa, struct ospf6_area *oa)
continue;
}
list_delete_all_node(old_route->nh_list);
ospf6_route_copy_nexthops(old_route, route);
old_entry_updated = true;
for (ALL_LIST_ELEMENTS_RO(old_route->paths, anode,
@ -1330,6 +1328,15 @@ void ospf6_abr_examin_summary(struct ospf6_lsa *lsa, struct ospf6_area *oa)
}
}
/* We added a path or updated a path's nexthops above,
* recompute (old) route nexthops by merging all path nexthops
*/
list_delete_all_node(old_route->nh_list);
for (ALL_LIST_ELEMENTS_RO(old_route->paths, anode, o_path)) {
ospf6_merge_nexthops(old_route->nh_list,
o_path->nh_list);
}
if (is_debug)
zlog_debug(
"%s: Update route: %s %p old cost %u new cost %u nh %u",

22
tests/topotests/ospf6_ecmp_inter_area/r5/ospf6d.conf
View file

@ -4,7 +4,7 @@ interface r5-eth0
ipv6 ospf6 dead-interval 10
!
interface r5-eth1
ipv6 ospf6 area 0
ipv6 ospf6 area 1
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
@ -13,26 +13,6 @@ interface r5-eth2
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r5-eth3
ipv6 ospf6 area 1
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r5-eth4
ipv6 ospf6 area 1
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r5-eth5
ipv6 ospf6 area 0
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r5-eth6
ipv6 ospf6 area 0
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
router ospf6
ospf6 router-id 10.254.254.5
redistribute connected

15
tests/topotests/ospf6_ecmp_inter_area/r6/ospf6d.conf
View file

@ -1,8 +1,23 @@
interface r6-eth0
ipv6 ospf6 area 0
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r6-eth1
ipv6 ospf6 area 0
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r6-eth2
ipv6 ospf6 area 1
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r6-eth3
ipv6 ospf6 area 0
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
router ospf6
ospf6 router-id 10.254.254.6
redistribute connected

17
tests/topotests/ospf6_ecmp_inter_area/r7/ospf6d.conf
View file

@ -1,11 +1,22 @@
interface lo
ipv6 ospf6 area 1
!
interface r7-eth0
ipv6 ospf6 area 1
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r7-eth1
ipv6 ospf6 area 1
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r7-eth2
ipv6 ospf6 area 1
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r7-eth3
shutdown
!
router ospf6
ospf6 router-id 10.254.254.7
redistribute connected
!

3
tests/topotests/ospf6_ecmp_inter_area/r7/zebra.conf
View file

@ -3,3 +3,6 @@ ipv6 forwarding
interface lo
ipv6 address 2001:db8:7::1/64
!
interface r7-eth2
ipv6 address 2001:db8:8007::1/64
!

13
tests/topotests/ospf6_ecmp_inter_area/r8/ospf6d.conf
View file

@ -3,6 +3,19 @@ interface r8-eth0
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r8-eth1
ipv6 ospf6 area 0
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r8-eth2
ipv6 ospf6 area 0
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
interface r8-eth3
shutdown
!
router ospf6
ospf6 router-id 10.254.254.8
redistribute connected

3
tests/topotests/ospf6_ecmp_inter_area/r8/zebra.conf
View file

@ -3,3 +3,6 @@ ipv6 forwarding
interface lo
ipv6 address 2001:db8:8::1/64
!
interface r8-eth2
ipv6 address 2001:db8:8008::1/64
!

11
tests/topotests/ospf6_ecmp_inter_area/r9/ospf6d.conf
View file

@ -1,11 +0,0 @@
interface lo
ipv6 ospf6 area 0
!
interface r9-eth0
ipv6 ospf6 area 0
ipv6 ospf6 hello-interval 2
ipv6 ospf6 dead-interval 10
!
router ospf6
ospf6 router-id 10.254.254.9
!

5
tests/topotests/ospf6_ecmp_inter_area/r9/zebra.conf
View file

@ -1,5 +0,0 @@
ipv6 forwarding
!
interface lo
ipv6 address 2001:db8:9::1/64
!

115
tests/topotests/ospf6_ecmp_inter_area/test_ospf6_ecmp_inter_area.py
View file

@ -3,7 +3,7 @@
# test_ospf6_ecmp_inter_area.py
#
# Copyright (c) 2021, 2022 by Martin Buck
# Copyright (c) 2021, 2022, 2024 by Martin Buck
# Copyright (c) 2016 by
# Network Device Education Foundation, Inc. ("NetDEF")
#
@ -11,35 +11,42 @@
r"""
test_ospf6_ecmp_inter_area.py: Test OSPFv3 ECMP inter-area nexthop update
Check proper removal of ECMP nexthops after a path used by one nexthop
disappears. We remove a path by bringing down a link required by that
path which is not adjacent to the router being checked. This is important
because when bringing down adjacent links, the kernel might remove the
nexthops itself without ospf6d having to do anything.
Check proper addition and removal of ECMP nexthops in 2 cases: Parallel
paths to one ABR and parallel ABRs. We test nexthop removal triggered by
path removal by bringing down a link required by that path which is not
adjacent to the router being checked. This is important because when
bringing down adjacent links, the kernel might remove the nexthops itself
without ospf6d having to do anything.
Useful as a regression test for #9720.
Useful as a regression test for #9720 and #15777.
Topology:
.
Area 0 . Area 1
.
-- R2 -- . ---- R6
/ \ ./
R1 -- R3 -- R5 ---- R7 Area 1
\ / \\ ..............
-- R4 -- \--- R8 Area 0
\
-- R9
.
Area 0 . Area 1
.
-- R2 ------ R5 -----
/ .\ \
/ . | \
R1 --- R3 ------ R6 ------ R7
\ / |. |
\ / |. |
-- R4 ---- |. |
/ ./
R8 --
.
We check routes on R1, primarily those towards R6/7/8/9. Those to R6/7 are
inter-area routes with R5 being ABR, those to R8/9 are intra-area routes
and are used for reference. R6/R8 announce external routes, R7/R9 announce
internal routes.
We check routes on R1, primarily those towards R7/8. Those to R7 are
inter-area routes with R5/6 being ABRs, those to R8 are intra-area routes
and are used for reference. R7/R8 announce one internal and one external
route each.
With all links up, we expect 3 ECMP paths and 3 nexthops on R1 towards each
of R6/7/8/9. Then we bring down the R2-R5 link, causing only 2 remaining
paths and 2 nexthops on R1. The test is successful if the number of nexthops
for the routes on R1 is as expected.
of R7/8. Then we bring down the R3-R6 link, causing only 2 remaining
paths and 2 nexthops on R1. Then we bring down the R2-R5 link, causing only
1 remaining path and 1 nexthop on R1.
The test is successful if the number of nexthops for the routes on R1 is as
expected.
"""
import os
@ -65,20 +72,24 @@ pytestmark = [pytest.mark.ospf6d]
def build_topo(tgen):
"Build function"
# Create 9 routers
for routern in range(1, 10):
# Create 8 routers
for routern in range(1, 9):
tgen.add_router("r{}".format(routern))
tgen.gears["r1"].add_link(tgen.gears["r2"])
tgen.gears["r1"].add_link(tgen.gears["r3"])
tgen.gears["r1"].add_link(tgen.gears["r4"])
tgen.gears["r2"].add_link(tgen.gears["r5"])
tgen.gears["r3"].add_link(tgen.gears["r5"])
tgen.gears["r4"].add_link(tgen.gears["r5"])
tgen.gears["r5"].add_link(tgen.gears["r6"])
tgen.gears["r3"].add_link(tgen.gears["r6"])
tgen.gears["r4"].add_link(tgen.gears["r6"])
tgen.gears["r5"].add_link(tgen.gears["r7"])
tgen.gears["r5"].add_link(tgen.gears["r8"])
tgen.gears["r5"].add_link(tgen.gears["r9"])
tgen.gears["r6"].add_link(tgen.gears["r7"])
tgen.gears["r6"].add_link(tgen.gears["r8"])
# Additional "loopback" interfaces. Not used for communication, just to
# hold an address we use to inject intra-/inter-area routes (the one on
# the real "lo" loopback is used for external routes).
tgen.gears["r7"].add_link(tgen.gears["r7"])
tgen.gears["r8"].add_link(tgen.gears["r8"])
def setup_module(mod):
@ -131,20 +142,19 @@ def test_wait_protocol_convergence():
expect_neighbor_full("r2", "10.254.254.1")
expect_neighbor_full("r2", "10.254.254.5")
expect_neighbor_full("r3", "10.254.254.1")
expect_neighbor_full("r3", "10.254.254.5")
expect_neighbor_full("r3", "10.254.254.6")
expect_neighbor_full("r4", "10.254.254.1")
expect_neighbor_full("r4", "10.254.254.5")
expect_neighbor_full("r4", "10.254.254.6")
expect_neighbor_full("r5", "10.254.254.2")
expect_neighbor_full("r5", "10.254.254.3")
expect_neighbor_full("r5", "10.254.254.4")
expect_neighbor_full("r5", "10.254.254.6")
expect_neighbor_full("r5", "10.254.254.7")
expect_neighbor_full("r5", "10.254.254.8")
expect_neighbor_full("r5", "10.254.254.9")
expect_neighbor_full("r6", "10.254.254.5")
expect_neighbor_full("r6", "10.254.254.3")
expect_neighbor_full("r6", "10.254.254.7")
expect_neighbor_full("r6", "10.254.254.8")
expect_neighbor_full("r7", "10.254.254.5")
expect_neighbor_full("r7", "10.254.254.6")
expect_neighbor_full("r8", "10.254.254.5")
expect_neighbor_full("r9", "10.254.254.5")
expect_neighbor_full("r8", "10.254.254.6")
def test_ecmp_inter_area():
@ -154,9 +164,16 @@ def test_ecmp_inter_area():
pytest.skip(tgen.errors)
def num_nexthops(router):
routes = tgen.gears[router].vtysh_cmd("show ipv6 ospf6 route json", isjson=True)
route_prefixes_infos = sorted(routes.get("routes", {}).items())
return [len(ri.get("nextHops", [])) for rp, ri in route_prefixes_infos]
# Careful: "show ipv6 ospf6 route json" doesn't work here. It will
# only list one route type per prefix and that might not necessarily
# be the best/selected route. "show ipv6 route ospf6 json" only
# lists selected routes, so that's more useful in this case.
routes = tgen.gears[router].vtysh_cmd("show ipv6 route ospf6 json", isjson=True)
route_prefixes_infos = sorted(routes.items())
# Note: ri may contain one entry per routing protocol, but since
# we've explicitly requested only ospf6 above, we can count on ri[0]
# being the entry we're looking for.
return [ri[0]["internalNextHopActiveNum"] for rp, ri in route_prefixes_infos]
def expect_num_nexthops(router, expected_num_nexthops, count):
"Wait until number of nexthops for routes matches expectation"
@ -174,14 +191,22 @@ def test_ecmp_inter_area():
), "'{}' wrong number of route nexthops".format(router)
# Check nexthops pre link-down
expect_num_nexthops("r1", [1, 1, 1, 3, 3, 3, 3, 3, 3, 3], 4)
# tgen.mininet_cli()
expect_num_nexthops("r1", [1, 1, 1, 1, 2, 3, 3, 3, 3], 4)
logger.info("triggering R2-R4 link down")
logger.info("triggering R3-R6 link down")
tgen.gears["r3"].run("ip link set r3-eth1 down")
# tgen.mininet_cli()
# Check nexthops post link-down
expect_num_nexthops("r1", [1, 1, 1, 1, 1, 2, 2, 2, 2], 8)
logger.info("triggering R2-R5 link down")
tgen.gears["r2"].run("ip link set r2-eth1 down")
# tgen.mininet_cli()
# Check nexthops post link-down
expect_num_nexthops("r1", [1, 1, 1, 2, 2, 2, 2, 2, 2, 2], 8)
expect_num_nexthops("r1", [1, 1, 1, 1, 1, 1, 1, 1, 1], 8)
def teardown_module(_mod):