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RFC 6325, "Routing Bridges (RBridges): Base Protocol Specification", July 2011

Source of RFC: trill (int)

Errata ID: 4573
Status: Verified
Type: Technical
Publication Format(s) : TEXT

Reported By: Donald Eastlake, 3rd
Date Reported: 2015-12-30
Verifier Name: Brian Haberman
Date Verified: 2016-01-15

Section 4.9.1 says:

   o  End-station service disable (trunk port) bit.  When this bit is
      set, all native frames received on the port and all native frames
      that would have been sent on the port are discarded.  (See
      Appendix B.)  (Note that, for this document, "native frames" does
      not include Layer 2 control frames.)  By default, ports are not
      restricted to being trunk ports.

      If a port with end-station service disabled reports, in a TRILL-
      Hello frame it sends out that port, which VLANs it provides end-
      station support for, it reports that there are none.

   o  TRILL traffic disable (access port) bit.  If this bit is set, the
      goal is to avoid sending any TRILL frames, except TRILL-Hello
      frames, on the port since it is intended only for native end-
      station traffic.  By default, ports are not restricted to being
      access ports.  This bit is reported in TRILL-Hello frames.  If RB1
      is the DRB and has this bit set in its TRILL-Hello, the DRB still
      appoints VLAN forwarders.  However, usually no pseudonode is
      reported, and none of the inter-RBridge links associated with that
      link are reported in LSPs.

      If the DRB RB1 does not have this bit set, but neighbor RB2 on the
      link does have the bit set, then RB1 does not appoint RB2 as
      appointed forwarder for any VLAN, and none of the RBridges
      (including the pseudonode) report RB2 as a neighbor in LSPs.


It should say:

   o  End-station service disable (trunk port) bit.  When this bit is
      set, all native frames received on the port and all native frames
      that would have been sent on the port are discarded.  (See
      Appendix B.)  (Note that, for this document, "native frames" does
      not include Layer 2 control frames.)  By default, ports are not
      restricted to being trunk ports.

      If the DRB RB1 does not have this bit set, but neighbor RB2 on the
      link does have the bit set, then RB1 does not appoint RB2 as
      appointed forwarder for any VLAN, and none of the RBridges
      (including the pseudonode) report RB2 as a neighbor in LSPs.

      If a port with end-station service disabled reports, in a TRILL-
      Hello frame it sends out that port, which VLANs it provides end-
      station support for, it reports that there are none.

   o  TRILL traffic disable (access port) bit.  If this bit is set, the
      goal is to avoid sending any TRILL frames, except TRILL-Hello
      frames, on the port since it is intended only for native end-
      station traffic.  By default, ports are not restricted to being
      access ports.  This bit is reported in TRILL-Hello frames.  If RB1
      is the DRB and has this bit set in its TRILL-Hello, the DRB still
      appoints VLAN forwarders.  However, usually no pseudonode is
      reported, and none of the inter-RBridge links associated with that
      link are reported in LSPs.

Notes:

There is a paragraph in the wrong place so that it appears to apply to the wrong bit.

The second paragraph of bullet item 3 in Section 4.9.1 (the second bullet item at the top of page 72) is in the wrong place and appears to apply to the TRILL traffic disable (access port) bit. This text should instead be part of the previous bullet item and, in fact, applies to the end-station service disable (trunk port) bit.

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