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Donald Sharp fc3de981be zebra: Allow kernel routes to stick around better on interface state changes 
Currently kernel routes on system bring up would be `auto-accepted`,
then if an interface went down all kernel and system routes would
be re-evaluated.  There exists situations where a kernel route can
exist but the interface itself is not exactly in a state that is
ready to create a connected route yet.  As such when any interface
goes down in the system all kernel/system routes would be re-evaluated
and then since that interfaces connected route is not in the table yet
the route is matching against a default route( or not at all ) and
is being dropped.

Modify the code such that kernel or system routes just look for interface
being in a good state (up or operative) and accept it.

Broken code:
eva# show ip route
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure

K>* 0.0.0.0/0 [0/100] via 192.168.119.1, enp39s0, 00:05:08
K>* 1.2.3.5/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.6/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.7/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.8/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.9/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.10/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.11/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.12/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.13/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.14/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.16/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 1.2.3.17/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
C>* 4.5.6.99/32 is directly connected, dummy9, 00:05:08
K>* 4.9.10.11/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:05:08
K>* 10.11.12.13/32 [0/0] via 192.168.119.1, enp39s0, 00:05:08
C>* 192.168.10.0/24 is directly connected, dummy99, 00:05:08
C>* 192.168.119.0/24 is directly connected, enp39s0, 00:05:08
<shutdown a non-related interface>
eva# show ip route
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure

K>* 0.0.0.0/0 [0/100] via 192.168.119.1, enp39s0, 00:05:28
C>* 4.5.6.99/32 is directly connected, dummy9, 00:05:28
K>* 10.11.12.13/32 [0/0] via 192.168.119.1, enp39s0, 00:05:28
C>* 192.168.10.0/24 is directly connected, dummy99, 00:05:28
C>* 192.168.119.0/24 is directly connected, enp39s0, 00:05:28

Working code:
eva# show ip route
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure

K>* 0.0.0.0/0 [0/100] via 192.168.119.1, enp39s0, 00:00:04
K>* 1.2.3.5/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.6/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.7/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.8/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.9/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.10/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.11/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.12/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.13/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.14/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.16/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 1.2.3.17/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
C>* 4.5.6.99/32 is directly connected, dummy9, 00:00:04
K>* 4.9.10.11/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:04
K>* 10.11.12.13/32 [0/0] via 192.168.119.1, enp39s0, 00:00:04
C>* 192.168.10.0/24 is directly connected, dummy99, 00:00:04
C>* 192.168.119.0/24 is directly connected, enp39s0, 00:00:04
<shutdown a non-related interface>
eva# show ip route
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure

K>* 0.0.0.0/0 [0/100] via 192.168.119.1, enp39s0, 00:00:15
K>* 1.2.3.5/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.6/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.7/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.8/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.9/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.10/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.11/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.12/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.13/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.14/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.16/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 1.2.3.17/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
C>* 4.5.6.99/32 is directly connected, dummy9, 00:00:15
K>* 4.9.10.11/32 [0/0] via 172.22.0.44, br-23e378ed7fd2 linkdown, 00:00:15
K>* 10.11.12.13/32 [0/0] via 192.168.119.1, enp39s0, 00:00:15
C>* 192.168.10.0/24 is directly connected, dummy99, 00:00:15
C>* 192.168.119.0/24 is directly connected, enp39s0, 00:00:15
eva#

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
2022-06-23 12:22:30 -04:00
.github github: Autoclose stale issues/PRs that are stare longer than 180 days 2022-06-16 21:54:55 +03:00
alpine alpine: fix path for daemons file install 2021-08-30 15:21:59 -04:00
babeld babeld: Ignore sub-tlv's with mandatory bit set 2022-06-09 07:04:01 -04:00
bfdd bfdd: Prevent coverity from thinking values are uninited 2022-05-12 16:58:29 -04:00
bgpd Merge pull request #10629 from leonshaw/fix/mp-evpn-nh 2022-06-23 07:00:33 -04:00
debian debian: Update changelog for new release (8.4) 2022-06-07 23:26:58 +03:00
doc Merge pull request #11437 from rgirada/ospf_nbr 2022-06-22 14:54:08 -04:00
docker Merge pull request #11270 from opensourcerouting/fix/docker_builds_centos 2022-05-24 17:50:34 -04:00
eigrpd eigrpd: vrf variable name hides a parameter of the same name 2022-06-16 16:31:35 -04:00
fpm build: fix AM_LDFLAGS usage (and gcov) 2021-07-21 17:10:08 +02:00
gdb *: Cleanup some documentation from quagga->frr 2021-11-11 14:41:27 -05:00
grpc build: fix AM_LDFLAGS usage (and gcov) 2021-07-21 17:10:08 +02:00
include zebra: netlink registry rtm tunnel notif 2022-05-18 07:56:35 -07:00
isisd *: Use autocomplete for route-maps under commands that require it 2022-06-13 21:00:51 +03:00
ldpd *: use FRR interface name definition everywhere 2022-05-02 13:00:12 -03:00
lib lib, zebra: Notice when a nexthop is set linkdown 2022-06-23 11:23:37 -04:00
m4 autoconf: do not .gitignore m4/ax_lua.m4 2022-03-26 15:05:54 +01:00
mlag build: fix AM_LDFLAGS usage (and gcov) 2021-07-21 17:10:08 +02:00
nhrpd *: Replace sockunion2str => %pSU 2022-06-21 13:34:56 +03:00
ospf6d ospf6d: cost is uint32_t so it cannot be greater than UINT32_MAX 2022-06-16 16:31:35 -04:00
ospfclient ospfclient: fix help url 2022-06-21 09:54:31 -05:00
ospfd ospfd: Fixing "show ip ospf neighbour <nbrid>" command 2022-06-22 08:40:24 -07:00
pathd *: Properly use memset() when zeroing 2022-05-11 14:08:47 +03:00
pbrd Merge pull request #11059 from anlancs/fix/bgpd-evnp-wrong-check-hashget 2022-05-04 21:19:51 +03:00
pceplib *: Properly use memset() when zeroing 2022-05-11 14:08:47 +03:00
pimd pim6d: Send register msg with IPv6 global address 2022-06-21 20:44:10 -07:00
pkgsrc *: cleanup .gitignore files 2018-09-08 21:30:42 +02:00
python python: Remove redundant import of subprocess 2022-06-16 16:31:35 -04:00
qpb build: fix AM_LDFLAGS usage (and gcov) 2021-07-21 17:10:08 +02:00
redhat redhat: Update changelog for new release (8.4) 2022-06-07 23:26:56 +03:00
ripd *: Use autocomplete for route-maps under commands that require it 2022-06-13 21:00:51 +03:00
ripngd *: Use autocomplete for route-maps under commands that require it 2022-06-13 21:00:51 +03:00
sharpd build: fix new gcc 11.2 warnings 2022-04-25 14:07:41 +02:00
snapcraft snap: Use librtr >= 0.8.0 for snap packages 2022-05-10 09:48:30 +03:00
staticd staticd: redo VRF_DEFAULT NHT registers on connect 2022-04-24 17:21:09 +02:00
tests Merge pull request #11448 from gpnaveen/ospf_scripts_stbl 2022-06-21 13:44:33 -05:00
tools tools: document frr_global_options in daemons file 2022-06-16 12:20:36 -04:00
vrrpd *: remove the checking returned value for hash_get() 2022-05-03 00:41:48 +08:00
vtysh vtysh: Add autocomplete for VRFs when using with router bgp 2022-06-14 13:41:13 +03:00
watchfrr *: Properly use memset() when zeroing 2022-05-11 14:08:47 +03:00
yang isisd: replace ipv4-unicast with standard in config and oper contexts 2022-06-02 21:20:45 +02:00
zebra zebra: Allow kernel routes to stick around better on interface state changes 2022-06-23 12:22:30 -04:00
.clang-format lib: add _last and _prev on typesafe RB/DLIST 2022-03-12 13:23:36 +01:00
.dir-locals.el tests: remove python format block from dir-locals 2021-09-13 10:04:29 -04:00
.dockerignore docker: Make docker image on CentOS 7 2019-11-26 19:29:30 +00:00
.git-blame-ignore-revs tools: Ignore mass renaming of topotests for git blame 2021-05-11 14:14:26 +03:00
.gitignore *: Add some missed make check generated files in .gitignore 2021-09-16 08:13:17 -04:00
.pylintrc tests: micronet: update infra 2021-09-04 09:04:46 -04:00
.travis.yml lib: libyang2 add missed conversion 2021-05-17 22:13:59 -04:00
bootstrap.sh build: turn on automake warnings (& symlinks) 2021-04-21 15:42:37 +02:00
buildtest.sh build: remove --enable-exampledir 2021-06-24 16:42:58 +02:00
config.version.in build: carry --with-pkg-extra-version into tarballs 2018-10-24 15:11:50 +02:00
configure.ac lib: Require at least 2.1.42 version of sysrepo when compiling 2022-06-09 18:03:22 +03:00
COPYING *: make consistent & update GPLv2 file headers 2017-05-15 16:37:41 +02:00
COPYING-LGPLv2.1 build: remove LGPL v2.0, add LGPL v2.1 2016-11-15 17:19:38 +09:00
Makefile.am build: fix AM_LDFLAGS usage (and gcov) 2021-07-21 17:10:08 +02:00
README.md doc: Fix the link that points to Slack invitation in README 2022-03-24 13:13:37 +02:00
stamp-h.in Initial revision 2002-12-13 20:15:29 +00:00
version.h build: make builddir include path consistent 2021-04-21 15:42:33 +02:00

README.md

Icon

FRRouting

FRR is free software that implements and manages various IPv4 and IPv6 routing protocols. It runs on nearly all distributions of Linux and BSD and supports all modern CPU architectures.

FRR currently supports the following protocols:

  • BGP
  • OSPFv2
  • OSPFv3
  • RIPv1
  • RIPv2
  • RIPng
  • IS-IS
  • PIM-SM/MSDP
  • LDP
  • BFD
  • Babel
  • PBR
  • OpenFabric
  • VRRP
  • EIGRP (alpha)
  • NHRP (alpha)

Installation & Use

For source tarballs, see the releases page.

For Debian and its derivatives, use the APT repository at https://deb.frrouting.org/.

Instructions on building and installing from source for supported platforms may be found in the developer docs.

Once installed, please refer to the user guide for instructions on use.

Community

The FRRouting email list server is located here and offers the following public lists:

Topic List
Development dev@lists.frrouting.org
Users & Operators frog@lists.frrouting.org
Announcements announce@lists.frrouting.org

For chat, we currently use Slack. You can join by clicking the "Slack" link under the Participate section of our website.

Contributing

FRR maintains developer's documentation which contains the project workflow and expectations for contributors. Some technical documentation on project internals is also available.

We welcome and appreciate all contributions, no matter how small!

Security

To report security issues, please use our security mailing list:

security [at] lists.frrouting.org