EIGRP Message Format
TLV(type/length/value)
- TLV with EIGRP参数
- IP Internal Routing’s TLV
- IP External Routing’s TLV
External Protocol ID
EIGRP Message Format : IP 88
┃ 8bit | 8bit | 16bit ┃
┏---------+--------+----------┓ ----|
┃ Version | Opcode | Checksum ┃ |
┠---------+--------+----------┨ |
┃ Flags ┃ 20byte
┠-----------------------------┨ |
┃ Sequence ┃ |
┠-----------------------------┨ |
┃ ACK ┃ |
┠-----------------------------┨ |
┃ Autonomous System Number ┃ |
┠-----------------------------┨ ----|
┃ TLV(type/length/value) ┃
┗-----------------------------┛
| number | TLV(type/length/value) |
|---|---|
| 0x0001 | EIGRP参数 |
| 0x0003 | Sequence |
| 0x0004 | Software Version |
| 0x0005 | Next Multicast Sequence |
| 0x0102 | IP Internal Routing |
| 0x0103 | IP External Routing |
| 0x0202 | AppleTalk Internal Routing |
| 0x0203 | AppleTalk External Routing |
| 0x0204 | AppleTalk link config |
| 0x0302 | IPX Internal Routing |
| 0x0303 | IPX External Routing |
TLV with EIGRP参数
┃ 8bit | 8bit | 8bit | 8bit ┃
┏---------------+-------------┓
┃ type=0x0001 | length ┃
┠------+--------+------+------┨
┃ K1 | K2 | K3 | K4 ┃
┠------+--------+------+------┨
┃ K5 |Reserved| hold time ┃
┗------+--------+-------------┛
IP Internal Routing’s TLV
┃ 8bit | 8bit | 8bit | 8bit ┃
┏--------------------+----------------┓
┃ type=0x0102 | length ┃
┠--------------------+----------------┨
┃ Next Hop ┃
┠-------------------------------------┨
┃ Delay ┃
┠-------------------------------------┨
┃ Bandwidth ┃
┠---------------------------+---------┨
┃ MTU |Hop Count┃
┠-------------+------+------+---------┨
┃ Reliability | Load | Reserved ┃
┠-------------+------+----------------┨
┃Prefix Length| Destination ┃
┗-------------+-----------------------┛
IP External Routing’s TLV
┃ 8bit | 8bit | 8bit | 8bit ┃
┏--------------------+------------------------------┓
┃ type=0x0103 | length ┃
┠--------------------+------------------------------┨
┃ Next Hop ┃
┠---------------------------------------------------┨
┃ Originating Router ┃
┠---------------------------------------------------┨
┃ Originating Autonomous System Number ┃
┠---------------------------------------------------┨
┃ Arbitrary Tag ┃
┠---------------------------------------------------┨
┃ External Protocol Metric ┃
┠--------------------+--------------------+---------┨
┃ Reserved |External Protocol ID| Flags ┃
┠--------------------+--------------------+---------┨
┃ Delay ┃
┠---------------------------------------------------┨
┃ Bandwidth ┃
┠-----------------------------------------+---------┨
┃ MTU |Hop Count┃
┠-------------+------+--------------------+---------┨
┃ Reliability | Load | Reserved ┃
┠-------------+------+------------------------------┨
┃Prefix Length| Destination ┃
┗-------------+-------------------------------------┛
External Protocol ID:
| ID | External Protocol |
|---|---|
| 0x01 | IGRP |
| 0x02 | EIGRP |
| 0x03 | Static Route |
| 0x04 | RIP |
| 0x05 | Hello |
| 0x06 | OSPF |
| 0x07 | IS-IS |
| 0x08 | EGP |
| 0x09 | BGP |
| 0x0a | IDRP |
| 0x0b | Direct Connect |