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Status: Verified (1)

RFC 7868, "Cisco's Enhanced Interior Gateway Routing Protocol (EIGRP)", May 2016

Source of RFC: INDEPENDENT

Errata ID: 5030

Status: Verified
Type: Technical

Reported By: Travis P. Bonfigli
Date Reported: 2017-06-06
Verifier Name: Nevil Brownlee
Date Verified: 2017-07-20

Section 6.7.4 says:

6.7.4.  0x0004 - SOFTWARE_VERSION_TYPE

           Field                        Length
           Vender OS major version        1
           Vender OS minor version        1
           EIGRP major revision           1
           EIGRP minor revision           1

   The EIGRP TLV Version fields are used to determine TLV format
   versions.  Routers using Version 1.2 TLVs do not understand Version
   2.0 TLVs, therefore Version 2.0 routers must send the packet with
   both TLV formats in a mixed network.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |            0x0004             |            0x000C             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |Vendor Major V.|Vendor Minor V.| EIGRP Major V.| EIGRP Minor V.|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

It should say:

6.7.4.  0x0004 - SOFTWARE_VERSION_TYPE

           Field                        Length
           Vender OS major version        1
           Vender OS minor version        1
           EIGRP major revision           1
           EIGRP minor revision           1

   The EIGRP TLV Version fields are used to determine TLV format
   versions.  Routers using Version 1.2 TLVs do not understand Version
   2.0 TLVs, therefore Version 2.0 routers must send the packet with
   both TLV formats in a mixed network.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |            0x0004             |            0x0008             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |Vendor Major V.|Vendor Minor V.| EIGRP Major V.| EIGRP Minor V.|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Notes:

Hello! In looking over the TLV construct in Section 6.7.4 0x0004 - SOFTWARE_VERSION_TYPE it appears that they might be a 'typo' with respect to the 'Length' value provided in the RFC diagram. The current value is shown as 0x000C (12 bytes), but in reality it appears that it should be 0x0008 (8 bytes) given the format/length of the specific TLV being discussed. Thank you.

Cheers,
Travis

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