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Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com> If you are doing multipath in a VRF and bounce one of the multipaths for a prefix, bgp is not updating the zebra entry for that prefix with the new multipaths. We start with: cel-redxp-10# show bgp vrf RED ipv4 unicast 6.0.0.16/32 BGP routing table entry for 6.0.0.16/32 Paths: (4 available, best #4, table RED) Advertised to non peer-group peers: spine-1(swp1) spine-2(swp2) spine-3(swp3) spine-4(swp4) 104 65104 65002 fe80::202:ff:fe00:2d from spine-4(swp4) (6.0.0.12) (fe80::202:ff:fe00:2d) (used) Origin incomplete, localpref 100, valid, external, multipath, bestpath-from-AS 104 AddPath ID: RX 0, TX 21 Last update: Tue Aug 1 18:28:33 2017 102 65104 65002 fe80::202:ff:fe00:25 from spine-2(swp2) (6.0.0.10) (fe80::202:ff:fe00:25) (used) Origin incomplete, localpref 100, valid, external, multipath, bestpath-from-AS 102 AddPath ID: RX 0, TX 20 Last update: Tue Aug 1 18:28:33 2017 103 65104 65002 fe80::202:ff:fe00:29 from spine-3(swp3) (6.0.0.11) (fe80::202:ff:fe00:29) (used) Origin incomplete, localpref 100, valid, external, multipath, bestpath-from-AS 103 AddPath ID: RX 0, TX 17 Last update: Tue Aug 1 18:28:33 2017 101 65104 65002 fe80::202:ff:fe00:21 from spine-1(swp1) (6.0.0.9) (fe80::202:ff:fe00:21) (used) Origin incomplete, localpref 100, valid, external, multipath, bestpath-from-AS 101, best AddPath ID: RX 0, TX 8 Last update: Tue Aug 1 18:28:33 2017 cel-redxp-10# cel-redxp-10# show ip route vrf RED 6.0.0.16/32 Routing entry for 6.0.0.16/32 Known via "bgp", distance 20, metric 0, vrf RED, best Last update 00:00:25 ago * fe80::202:ff:fe00:21, via swp1 * fe80::202:ff:fe00:25, via swp2 * fe80::202:ff:fe00:29, via swp3 * fe80::202:ff:fe00:2d, via swp4 cel-redxp-10# And then on spine-1 we bounce all peers spine-1# clear ip bgp * spine-1# On the leaf (cel-redxp-10) we remove the route from spine-1 cel-redxp-10# show ip route vrf RED 6.0.0.16/32 Routing entry for 6.0.0.16/32 Known via "bgp", distance 20, metric 0, vrf RED, best Last update 00:00:01 ago * fe80::202:ff:fe00:25, via swp2 * fe80::202:ff:fe00:29, via swp3 * fe80::202:ff:fe00:2d, via swp4 cel-redxp-10# So far so good. The problem is when the session to spine-1 comes back up bgp will mark the flag from spine-1 as `multipath` but does not update zebra. We end up in a state where BGP has 4 paths flags as multipath but only 3 paths are in the RIB. |
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| debian | ||
| doc | ||
| eigrpd | ||
| fpm | ||
| gdb | ||
| init | ||
| isisd | ||
| ldpd | ||
| lib | ||
| m4 | ||
| nhrpd | ||
| ospf6d | ||
| ospfclient | ||
| ospfd | ||
| pimd | ||
| pkgsrc | ||
| ports | ||
| python | ||
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| ripd | ||
| ripngd | ||
| snapcraft | ||
| solaris | ||
| tests | ||
| tools | ||
| vtysh | ||
| watchfrr | ||
| zebra | ||
| .clang-format | ||
| .gitignore | ||
| AUTHORS | ||
| bootstrap.sh | ||
| buildtest.sh | ||
| ChangeLog | ||
| common.am | ||
| COMMUNITY.md | ||
| configure.ac | ||
| COPYING | ||
| COPYING-LGPLv2.1 | ||
| defaults.h | ||
| git-reindent-branch.py | ||
| indent.py | ||
| Makefile.am | ||
| NEWS | ||
| README | ||
| README.NetBSD | ||
| render_md.py | ||
| REPORTING-BUGS | ||
| SERVICES | ||
| stamp-h.in | ||
| update-autotools | ||
FRRouting is free software that manages various IPv4 and IPv6 routing protocols. Currently FRRouting supports BGP4, BGP4+, OSPFv2, OSPFv3, RIPv1, RIPv2, RIPng, PIM-SM/MSDP and LDP as well as very early support for IS-IS, EIGRP and NHRP. See the file REPORTING-BUGS to report bugs. Free RRRouting is free software. See the file COPYING for copying conditions. Public email discussion can be found at https://lists.frrouting.org/listinfo Our public slack channel is at https://frrouting.slack.com