EIGRP (`eigrp`)

Layer: L3 (network)
Header: variable length
Notes: Routing protocols

Reached from

Lower layer	Selector	Value
`ipv4`	`protocol`	88 (0x58)
`ipv6`	`next_header`	88 (0x58)
`ipv6_hopopts`	`next_header`	88 (0x58)
`ipv6_route`	`next_header`	88 (0x58)
`ipv6_srh`	`next_header`	88 (0x58)
`ipv6_frag`	`next_header`	88 (0x58)
`ipv6_dstopts`	`next_header`	88 (0x58)

Fields

Field	Type	Default	Auto	Description
`version`	`uint(8)`	`2`		EIGRP header version (2).
`opcode`	`enum(8)`	`5` (hello)		EIGRP opcode (Update / Query / Reply / Hello / SIA-Query / SIA-Reply).
`checksum`	`uint(16)`		Internet checksum over the header and everything after it	Internet checksum over the EIGRP packet (Auto).
`flags`	`flags(32)`	`0x0`		EIGRP flags (Init, Conditional Receive, Restart, End of Table).
`sequence`	`uint(32)`	`0`		Sequence number for reliable delivery.
`acknowledge`	`uint(32)`	`0`		Acknowledged sequence number (0 = none).
`virtual_router_id`	`uint(16)`	`0`		Virtual router ID (0 = unicast address family).
`autonomous_system`	`uint(16)`	`100`		EIGRP autonomous system number.
`tlvs`	`tlv` — rest of the PDU	2 items		EIGRP TLVs (16-bit type, 16-bit length including the header).

`opcode`

Value	Name
1 (0x01)	`update`
3 (0x03)	`query`
4 (0x04)	`reply`
5 (0x05)	`hello`
10 (0x0a)	`sia_query`
11 (0x0b)	`sia_reply`

`flags`

Bit	Mask	Name
0	1 (0x00000001)	`init`
1	2 (0x00000002)	`conditional_receive`
2	4 (0x00000004)	`restart`
3	8 (0x00000008)	`end_of_table`

`tlvs`

Type 16 bits, length 16 bits.
The length counts the type and length fields too.
Unknown types are kept as raw value octets.

Type	Name	Value fields	Description
1 (0x0001)	`parameters`	`k1`, `k2`, `k3`, `k4`, `k5`, `k6`, `hold_time`
2 (0x0002)	`authentication`	`data`
3 (0x0003)	`sequence`	`address_length`, `address`
4 (0x0004)	`software_version`	`os_major`, `os_minor`, `tlv_major`, `tlv_minor`
5 (0x0005)	`next_multicast_sequence`	`sequence`
7 (0x0007)	`peer_termination`	`data`
258 (0x0102)	`ipv4_internal`	`next_hop`, `delay`, `bandwidth`, `mtu`, `hop_count`, `reliability`, `load`, `internal_tag`, `flags`, `prefix_length`, `destination`
259 (0x0103)	`ipv4_external`	`next_hop`, `originating_router`, `originating_as`, `arbitrary_tag`, `external_metric`, `reserved`, `external_protocol`, `external_flags`, `delay`, `bandwidth`, `mtu`, `hop_count`, `reliability`, `load`, `internal_tag`, `flags`, `prefix_length`, `destination`
1026 (0x0402)	`ipv6_internal`	`next_hop`, `delay`, `bandwidth`, `mtu`, `hop_count`, `reliability`, `load`, `internal_tag`, `flags`, `prefix_length`, `destination`
1027 (0x0403)	`ipv6_external`	`next_hop`, `originating_router`, `originating_as`, `arbitrary_tag`, `external_metric`, `reserved`, `external_protocol`, `external_flags`, `delay`, `bandwidth`, `mtu`, `hop_count`, `reliability`, `load`, `internal_tag`, `flags`, `prefix_length`, `destination`

`tlvs` › `parameters`

Field	Type	Default	Auto	Description
`k1`	`uint(8)`
`k2`	`uint(8)`
`k3`	`uint(8)`
`k4`	`uint(8)`
`k5`	`uint(8)`
`k6`	`uint(8)`
`hold_time`	`uint(16)`

`tlvs` › `authentication`

Field	Type	Default	Auto	Description
`data`	`bytes` — rest of the PDU

`tlvs` › `sequence`

Field	Type	Default	Auto	Description
`address_length`	`uint(8)`
`address`	`bytes` — rest of the PDU

`tlvs` › `software_version`

Field	Type	Default	Auto	Description
`os_major`	`uint(8)`
`os_minor`	`uint(8)`
`tlv_major`	`uint(8)`
`tlv_minor`	`uint(8)`

`tlvs` › `next_multicast_sequence`

Field	Type	Default	Auto	Description
`sequence`	`uint(32)`

`tlvs` › `peer_termination`

Field	Type	Default	Auto	Description
`data`	`bytes` — rest of the PDU

`tlvs` › `ipv4_internal`

Field	Type	Default	Auto	Description
`next_hop`	`ipv4`
`delay`	`uint(32)`
`bandwidth`	`uint(32)`
`mtu`	`uint(24)`
`hop_count`	`uint(8)`
`reliability`	`uint(8)`
`load`	`uint(8)`
`internal_tag`	`uint(8)`
`flags`	`uint(8)`
`prefix_length`	`uint(8)`
`destination`	`bytes` — rest of the PDU

`tlvs` › `ipv4_external`

Field	Type	Default	Auto	Description
`next_hop`	`ipv4`
`originating_router`	`ipv4`
`originating_as`	`uint(32)`
`arbitrary_tag`	`uint(32)`
`external_metric`	`uint(32)`
`reserved`	`uint(16)`
`external_protocol`	`uint(8)`
`external_flags`	`uint(8)`
`delay`	`uint(32)`
`bandwidth`	`uint(32)`
`mtu`	`uint(24)`
`hop_count`	`uint(8)`
`reliability`	`uint(8)`
`load`	`uint(8)`
`internal_tag`	`uint(8)`
`flags`	`uint(8)`
`prefix_length`	`uint(8)`
`destination`	`bytes` — rest of the PDU

`tlvs` › `ipv6_internal`

Field	Type	Default	Auto	Description
`next_hop`	`ipv6`
`delay`	`uint(32)`
`bandwidth`	`uint(32)`
`mtu`	`uint(24)`
`hop_count`	`uint(8)`
`reliability`	`uint(8)`
`load`	`uint(8)`
`internal_tag`	`uint(8)`
`flags`	`uint(8)`
`prefix_length`	`uint(8)`
`destination`	`bytes` — rest of the PDU

`tlvs` › `ipv6_external`

Field	Type	Default	Auto	Description
`next_hop`	`ipv6`
`originating_router`	`ipv4`
`originating_as`	`uint(32)`
`arbitrary_tag`	`uint(32)`
`external_metric`	`uint(32)`
`reserved`	`uint(16)`
`external_protocol`	`uint(8)`
`external_flags`	`uint(8)`
`delay`	`uint(32)`
`bandwidth`	`uint(32)`
`mtu`	`uint(24)`
`hop_count`	`uint(8)`
`reliability`	`uint(8)`
`load`	`uint(8)`
`internal_tag`	`uint(8)`
`flags`	`uint(8)`
`prefix_length`	`uint(8)`
`destination`	`bytes` — rest of the PDU

Constraints

Level	Rule
warning	`version` = 2

Sample templates

eigrp-hello — templates/protocols/routing/eigrp-hello.wpg.yaml
eigrp-update — templates/protocols/routing/eigrp-update.wpg.yaml