4e8eda74ec
When you have suppress-fib-pending turned on it is possible to end up in a situation where the prefix is not withdrawn from downstream peers. Here is the timing that I believe is happening: a) have 2 paths to a peer. b) receive a withdrawal from 1 path, set BGP_NODE_FIB_INSTALL_PENDING and send the route install to zebra. c) receive a withdrawal from the other path. d) At this point we have a dest->flags set BGP_NODE_FIB_INSTALL_PENDING old_select the path_info going away, new_select is NULL e) A bit further down we call group_announce_route() which calls the code to see if we should advertise the path. It sees the BGP_NODE_FIB_INSTALL_PENDING flag and says, nope. f) the route is sent to zebra to withdraw, which unsets the BGP_NODE_FIB_INSTALL_PENDING. g) This function winds up and deletes the path_info. Dest now has no path infos. h) BGP receives the route install(from step b) and unsets the BGP_NODE_FIB_INSTALL_PENDING flag i) BGP receives the route removed from zebra (from step f) and unsets the flag again. We know if there is no new_select, let's go ahead and just unset the PENDING flag to allow the withdrawal to go out at the time when the second withdrawal is received. Signed-off-by: Donald Sharp <sharpd@nvidia.com> |
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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