TRILL Protocol Specification Changes from -06 to -07

1
TRILL Protocol Specification Changes from -06
to -07

• Donald Eastlake 3rd
• 1-508-786-7554
• Donald.Eastlake_at_motorola.com

2
Editorial Changes

1. Fix a few cases where hop count was off by 1.
2. Replace remaining Q-tag references with C-tag.
3. Add a few frame type definitions (Section 1.2)
   and a list of acronyms (new Section 10).
4. Re-order some sub-sections.
5. Make figure numbers section relative and add
   table numbers.

3
From Vancouver

1. Remove Pseudo-node suppression material.
2. Add ability to configure a port to drop native
   frames and not send native frames (i.e., no end
   station support).
3. Permit Rbridges to implement GVRP/MVRP (see also
   technical changes slide).
4. Add note that difficulties in determining link
   speed when there are intervening boxes is not
   unique to Rbridges.
5. Drop recommendation to set bridge flags in some
   802.1AB fields. (actually from Chicago but
   accidentally omitted in -06)

4
Expansions / Pseudo-Code

1. Add Section 4.8 giving a more detailed exposition
   of multipathing.
2. Add Section 2.5 comparing zero configuration
   802.1D, 802.1Q, and Rbridges.
3. Added note to Security Considerations to use care
   when using VLANs for security.
4. Pseudo-Code (Section 5) has been partially
   updated.

5
Technical Changes

1. IEEE 802.1 VLAN registration protocols (either
   the older GVRP or newer MVRP) didnt work. Added
   Section 4.7 which goes about 75 of the way to
   making MVRP (Multiple VLAN Registration Protocol,
   802.1ak) work so that Rbridges can incrementally
   replace 802.1Q customer bridges where either the
   replaced or remaining bridges have ports with
   dynamically registered VLANs.
2. Options see next slide.

6
Options

• For discussion purposes and to provide some
  examples
• The protocol-07 draft specifies only summary
  hop-by-hop and ingress-to-egress critical options
  present bits.
• Individual draft -rbridge-options-00 specifies
• A fairly complete options syntax and
• A number of specific options.