OSPFv2 Extended Prefix LSA (`ospfv2_ext_prefix_lsa`)

Layer: L3 (network)
Header: variable length
Notes: OSPF Opaque / SR, BGP MP / VPN / EVPN (P2)

Reached from

Lower layer	Selector	Value
`ospfv2_opaque_lsa`	`opaque_type`	7 (0x07)

Fields

Field	Type	Default	Auto	Description
`tlvs`	`tlv` — rest of the PDU	1 items		TLVs of the opaque LSA (16-bit type and length, values padded to 4 octets; lengths Auto).

`tlvs`

Type 16 bits, length 16 bits.
The length counts the value only.
Each item is zero-padded to a multiple of 4 octets (not counted in the length)
Unknown types are kept as raw value octets.

Type	Name	Value fields	Description
1 (0x0001)	`extended_prefix`	`route_type`, `prefix_length`, `address_family`, `flags`, `prefix`, `sub_tlvs`
2 (0x0002)	`extended_prefix_range`	`prefix_length`, `address_family`, `range_size`, `flags`, `reserved`, `prefix`, `sub_tlvs`

`tlvs` › `extended_prefix`

Field	Type	Default	Auto	Description
`route_type`	`enum(8)`
`prefix_length`	`uint(8)`
`address_family`	`uint(8)`
`flags`	`flags(8)`
`prefix`	`ipv4`
`sub_tlvs`	`tlv` — rest of the PDU

`tlvs` › `extended_prefix` › `route_type`

Value	Name
0 (0x00)	`unspecified`
1 (0x01)	`intra_area`
3 (0x03)	`inter_area`
5 (0x05)	`as_external`
7 (0x07)	`nssa_external`

`tlvs` › `extended_prefix` › `flags`

Bit	Mask	Name
7	128 (0x80)	`a`
6	64 (0x40)	`n`

`tlvs` › `extended_prefix` › `sub_tlvs`

Type 16 bits, length 16 bits.
The length counts the value only.
Each item is zero-padded to a multiple of 4 octets (not counted in the length)
Unknown types are kept as raw value octets.

Type	Name	Value fields	Description
2 (0x0002)	`prefix_sid_label`	`flags`, `reserved`, `mt_id`, `algorithm`, `label`; when the value is 7 octets
2 (0x0002)	`prefix_sid`	`flags`, `reserved`, `mt_id`, `algorithm`, `index`; when the value is 8 octets

`tlvs` › `extended_prefix` › `sub_tlvs` › `prefix_sid_label`

Field	Type	Default	Auto	Description
`flags`	`flags(8)`
`reserved`	`uint(8)`
`mt_id`	`uint(8)`
`algorithm`	`uint(8)`
`label`	`uint(24)`

tlvs › extended_prefix › sub_tlvs › prefix_sid_label › flags

Bit	Mask	Name
6	64 (0x40)	`np`
5	32 (0x20)	`m`
4	16 (0x10)	`e`
3	8 (0x08)	`v`
2	4 (0x04)	`l`

`tlvs` › `extended_prefix` › `sub_tlvs` › `prefix_sid`

Field	Type	Default	Auto	Description
`flags`	`flags(8)`
`reserved`	`uint(8)`
`mt_id`	`uint(8)`
`algorithm`	`uint(8)`
`index`	`uint(32)`

tlvs › extended_prefix › sub_tlvs › prefix_sid › flags

Bit	Mask	Name
6	64 (0x40)	`np`
5	32 (0x20)	`m`
4	16 (0x10)	`e`
3	8 (0x08)	`v`
2	4 (0x04)	`l`

`tlvs` › `extended_prefix_range`

Field	Type	Default	Auto	Description
`prefix_length`	`uint(8)`
`address_family`	`uint(8)`
`range_size`	`uint(16)`
`flags`	`flags(8)`
`reserved`	`uint(24)`
`prefix`	`ipv4`
`sub_tlvs`	`tlv` — rest of the PDU

`tlvs` › `extended_prefix_range` › `flags`

Bit	Mask	Name
7	128 (0x80)	`ia`

`tlvs` › `extended_prefix_range` › `sub_tlvs`

Type 16 bits, length 16 bits.
The length counts the value only.
Each item is zero-padded to a multiple of 4 octets (not counted in the length)
Unknown types are kept as raw value octets.

Type	Name	Value fields	Description
2 (0x0002)	`prefix_sid_label`	`flags`, `reserved`, `mt_id`, `algorithm`, `label`; when the value is 7 octets
2 (0x0002)	`prefix_sid`	`flags`, `reserved`, `mt_id`, `algorithm`, `index`; when the value is 8 octets

`tlvs` › `extended_prefix_range` › `sub_tlvs` › `prefix_sid_label`

Field	Type	Default	Auto	Description
`flags`	`flags(8)`
`reserved`	`uint(8)`
`mt_id`	`uint(8)`
`algorithm`	`uint(8)`
`label`	`uint(24)`

tlvs › extended_prefix_range › sub_tlvs › prefix_sid_label › flags

Bit	Mask	Name
6	64 (0x40)	`np`
5	32 (0x20)	`m`
4	16 (0x10)	`e`
3	8 (0x08)	`v`
2	4 (0x04)	`l`

`tlvs` › `extended_prefix_range` › `sub_tlvs` › `prefix_sid`

Field	Type	Default	Auto	Description
`flags`	`flags(8)`
`reserved`	`uint(8)`
`mt_id`	`uint(8)`
`algorithm`	`uint(8)`
`index`	`uint(32)`

tlvs › extended_prefix_range › sub_tlvs › prefix_sid › flags

Bit	Mask	Name
6	64 (0x40)	`np`
5	32 (0x20)	`m`
4	16 (0x10)	`e`
3	8 (0x08)	`v`
2	4 (0x04)	`l`

Sample templates

ospfv2-lsu-ext-prefix-sr — templates/protocols/routing/ospfv2-lsu-ext-prefix-sr.wpg.yaml