Hi Authors,
In "comparison of IP/LDP FRR Methods" section of the document , I feel
we should add comparison with TI-LFA
(draft-francois-spring-segment-routing-ti-lfa-01) where TI-LFA approach
achieves guaranteed coverage against link or node failure, in any IGP network,
relying on the flexibility of SR. This will give readers better picture and
enables them with more information so that they can choose MRT if they feel it
suites their requirement better; compared to IT-LFA...
Changes :
1. Introduction :
Other existing or proposed solutions are partial solutions or have
significant issues, as described below.
Summary Comparison of IP/LDP FRR Methods
+---------+-------------+-------------+-----------------------------+
| Method | Coverage | Alternate | Computation (in SPFs) |
| | | Looping? | |
+---------+-------------+-------------+-----------------------------+
| MRT-FRR | 100% | None | less than 3 |
| | Link/Node | | |
| | | | |
| LFA | Partial | Possible | per neighbor |
| | Link/Node | | |
| | | | |
| Remote | Partial | Possible | per neighbor (link) or |
| LFA | Link/Node | | neighbor's neighbor (node) |
| | | | |
| Not-Via | 100% | None | per link and node |
| | Link/Node | | |
| | | | |
| TI-LFA | 100% | Possible | per neighbor (link) or |
| | Link/Node | | neighbor's neighbor (node) |
| | | | |
+---------+-------------+-------------+-----------------------------+
Table 1
TI-LFA: Topology Independent Loop-free Alternate Fast
Re-route (TI-LFA), aimed at providing link and node protection of
node and adjacency segments within the Segment Routing (SR)
framework [draft-francois-spring-segment-routing-ti-lfa-01].
Has improved coverage over LFAs and Remote LFA for link and node
protection and also guarantees complete coverage. The trade-off
of looping traffic to improve coverage is still made.
The computation required is quite high with added complexity.
TI-LFA is supported only MPLS data plane with a requirement to
carry additional MPLS label stack on the link failure; on certain
topologies stack size can grow significantly based repair path.
Thanks & Regards
Anil S N
"Be liberal in what you accept, and conservative in what you send" - Jon Postel
_______________________________________________
rtgwg mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/rtgwg
