Transparent Interconnection of Lots of Links (TRILL): Using Data Labels for Tree Selection for Multi-Destination Data
draft-ietf-trill-tree-selection-05
Technical Summary
TRILL uses distribution trees to deliver multi-destination frames.
Multiple trees can be used by an ingress RBridge for flows regardless
of the VLAN, Fine Grained Label (FGL), and/or multicast group of the
flow. Different ingress RBridges may choose different distribution
trees for TRILL Data packets in the same VLAN, FGL, and/or multicast
group. To avoid unnecessary link utilization, distribution trees
should be pruned based on VLAN and/or FGL and/or multicast
destination address. If any VLAN, FGL, or multicast group can be sent
on any tree, for typical fast path hardware, the amount of pruning
information is multiplied by the number of trees; however, there is a
limited capacity for such pruning information.
This document specifies an optional facility to restrict the TRILL
Data packets sent on particular distribution trees by VLAN, FGL,
and/or multicast group thus reducing the total amount of pruning
information so that it can more easily be accommodated by fast path
hardware.
Working Group Summary
WG had discussion over 2+ years regarding data label based tree selection for multi-destination data.
The working came to a good consensus on this discussion
Document Quality
No known implementation of this technology.
Distribution trees, ECMP, and Fine-Grain Labels (FGL) exist in many implementation,
and some proprietary technology has similar features.
Personnel
Document Shepherd: Susan Hares
Responsible AD: Alia Atlas