c951ee6eee
TI-LFA is a modern fast-reroute (FRR) solution that leverages Segment Routing to pre-compute backup nexthops for all destinations in the network, helping to reduce traffic restoration times whenever a failure occurs. The backup nexthops are expected to be installed in the FIB so that they can be activated as soon as a failure is detected, making sub-50ms recovery possible (assuming an hierarchical FIB). TI-LFA is a huge step forward compared to prior IP-FRR solutions, like classic LFA and Remote LFA, as it guarantees 100% coverage for all destinations. This is possible thanks to the source routing capabilities of SR, which allows the backup nexthops to steer traffic around the failures (using as many SIDs as necessary). In addition to that, the repair paths always follow the post-convergence SPF tree, which prevents transient congestions and suboptimal routing from happening. Deploying TI-LFA is very simple as it only requires a single configuration command for each interface that needs to be protected (both link protection and node protection are available). In addition to IPv4 and IPv6 routes, SR Prefix-SIDs and Adj-SIDs are also protected by the backup nexthops computed by the TI-LFA algorithms. Signed-off-by: Renato Westphal <renato@opensourcerouting.org> |
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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