PIM Register (`pim_register`)

Layer: L3 (network)
Header: 8 octets (fixed)
Notes: Multicast control protocols

Reached from

Lower layer	Selector	Value
`ipv4`	`protocol`	103 (0x67)

Fields

Field	Type	Default	Auto	Description
`version`	`uint(4)`	`2`		PIM version (2).
`type`	`uint(4)`	`1`		PIM message type (Auto from the body: 0 Hello, 1 Register, 3 Join/Prune).
`reserved`	`uint(8)`	`0`
`checksum`	`uint(16)`		Internet checksum over the header	Internet checksum (whole message; Register: first 8 octets only) (Auto).
`border`	`uint(1)`	`0`		Border bit (sender is a PIM Multicast Border Router).
`null_register`	`uint(1)`	`0`		Null-Register bit (no encapsulated data packet).
`reserved2`	`uint(30)`	`0`

Next layer

The next layer is selected by type; when the field is Auto the builder writes the value of the protocol stacked above.

First 4 bits of the payload when type = 1

Value	Protocol
4	`ipv4`
6	`ipv6`

Constraints

Level	Rule
warning	`type` = 1

Sample templates

pim-register — templates/protocols/mcast/pim-register.wpg.yaml