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Status: Verified (2)

RFC 4803, "Generalized Multiprotocol Label Switching (GMPLS) Label Switching Router (LSR) Management Information Base", February 2007

Source of RFC: ccamp (rtg)

Errata ID: 1841
Status: Verified
Type: Technical
Publication Format(s) : TEXT

Reported By: Girish Mahanta
Date Reported: 2009-08-27
Verifier Name: Adrian Farrel
Date Verified: 2010-01-02

Section Section 7 says:

gmplsOutSegmentTTLDecrement OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object indicates the amount by which to decrement the Time
to Live (TTL) of any payload packets forwarded on this segment if
per-hop decrementing is being done.
A value of zero indicates that no decrement should be made or
that per-hop decrementing is not in use.
See the gmplsTunnelTTLDecrement object in the gmplsTunnelTable
of GMPLS-TE-STD-MIB for a value by which to decrement the TTL
for the whole of a tunnel.
This object cannot be modified if mplsOutSegmentRowStatus for
the associated entry in the mplsOutSegmentTable is active(1)."
REFERENCE
"1. Time To Live (TTL) Processing in Multi-Protocol Label
Switching (MPLS) Networks, RFC 3443.
2. Generalized Multiprotocol Label Switching (GMPLS) Traffic
Engineering Management Information Base, RFC 4802."
DEFVAL { 0 }
::= { gmplsOutSegmentEntry 2 }

It should say:

gmplsOutSegmentTTLDecrement OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object indicates the amount by which to decrement the Time
to Live (TTL) of any payload packets forwarded on this segment if
per-hop decrementing is being done.
A value of zero indicates that no decrement should be made or
that per-hop decrementing is not in use.
This object cannot be modified if mplsOutSegmentRowStatus for
the associated entry in the mplsOutSegmentTable is active(1)."
REFERENCE
"1. Time To Live (TTL) Processing in Multi-Protocol Label
Switching (MPLS) Networks, RFC 3443."
DEFVAL { 0 }
::= { gmplsOutSegmentEntry 2 }

Notes:

In gmplsOutSegmentTable for the object gmplsOutSegmentTTLDecrement there is no gmplsTunnelTTLDecrement object in the gmplsTunnelTable of GMPLS-TE-STD-MIB which is referenced.

Errata ID: 3831
Status: Verified
Type: Editorial
Publication Format(s) : TEXT

Reported By: Adrian Farrel
Date Reported: 2013-12-12
Verifier Name: Stewart Bryant
Date Verified: 2013-12-23

Section 6 says:

   In mplsXCTable:
   {
      mplsXCIndex                = 0x01,
      mplsXCInSegmentIndex       = 0x00000015,
      mplsXCOutSegmentIndex      = 0x00000012,
      mplsXCLspId                = 0x0102 -- unique ID
      mplsXCLabelStackIndex      = 0x00, -- only a single outgoing label
      mplsXCRowStatus            = createAndGo(4)
   }

   In mplsXCTable:
   {
      mplsXCIndex                = 0x02,
      mplsXCInSegmentIndex       = 0x00000016,
      mplsXCOutSegmentIndex      = 0x00000013,
      mplsXCLspId                = 0x0102 -- unique ID
      mplsXCLabelStackIndex      = 0x00, -- only a single outgoing label
      mplsXCRowStatus            = createAndGo(4)
   }

It should say:

   In mplsXCTable:
   {
      mplsXCIndex                = 0x01,
      mplsXCInSegmentIndex       = 0x00000015,
      mplsXCOutSegmentIndex      = 0x00000012,
      mplsXCLspId                = 0x0102 -- unique ID
      mplsXCLabelStackIndex      = 0x00, -- only a single outgoing label
      mplsXCRowStatus            = createAndGo(4)
   }

   In mplsXCTable:
   {
      mplsXCIndex                = 0x01,
      mplsXCInSegmentIndex       = 0x00000016,
      mplsXCOutSegmentIndex      = 0x00000013,
      mplsXCLspId                = 0x0102 -- unique ID
      mplsXCLabelStackIndex      = 0x00, -- only a single outgoing label
      mplsXCRowStatus            = createAndGo(4)
   }

Notes:

The entries in the mplsXCTable are indexed by {mplsXCIndex, mplsXCInSegmentIndex, mplsOutSegmentIndex}. All XC entries for the same LSP should share a common value of mplsXCIndex because mplsTunnelXCPointer can be set to point to the first entry and then all of the other entries can be found.

The error in the example in Section 6 is that it shows a different value of mplsXCIndex for the reverse direction cross-connects. It should be set to the same value as is used for the forward direction cross-connect.

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