OSPFv2 Extended Link LSA (`ospfv2_ext_link_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`	8 (0x08)

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_link`	`link_type`, `reserved`, `link_id`, `link_data`, `sub_tlvs`

`tlvs` › `extended_link`

Field	Type	Default	Auto	Description
`link_type`	`enum(8)`
`reserved`	`uint(24)`
`link_id`	`ipv4`
`link_data`	`ipv4`
`sub_tlvs`	`tlv` — rest of the PDU

`tlvs` › `extended_link` › `link_type`

Value	Name
1 (0x01)	`point_to_point`
2 (0x02)	`transit`
3 (0x03)	`stub`
4 (0x04)	`virtual`

`tlvs` › `extended_link` › `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)	`adj_sid`	`flags`, `reserved`, `mt_id`, `weight`, `label`; when the value is 7 octets
2 (0x0002)	`adj_sid_index`	`flags`, `reserved`, `mt_id`, `weight`, `index`; when the value is 8 octets
3 (0x0003)	`lan_adj_sid`	`flags`, `reserved`, `mt_id`, `weight`, `neighbor_id`, `label`; when the value is 11 octets
3 (0x0003)	`lan_adj_sid_index`	`flags`, `reserved`, `mt_id`, `weight`, `neighbor_id`, `index`; when the value is 12 octets

`tlvs` › `extended_link` › `sub_tlvs` › `adj_sid`

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

tlvs › extended_link › sub_tlvs › adj_sid › flags

Bit	Mask	Name
7	128 (0x80)	`b`
6	64 (0x40)	`v`
5	32 (0x20)	`l`
4	16 (0x10)	`g`
3	8 (0x08)	`p`

`tlvs` › `extended_link` › `sub_tlvs` › `adj_sid_index`

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

tlvs › extended_link › sub_tlvs › adj_sid_index › flags

Bit	Mask	Name
7	128 (0x80)	`b`
6	64 (0x40)	`v`
5	32 (0x20)	`l`
4	16 (0x10)	`g`
3	8 (0x08)	`p`

`tlvs` › `extended_link` › `sub_tlvs` › `lan_adj_sid`

Field	Type	Default	Auto	Description
`flags`	`flags(8)`
`reserved`	`uint(8)`
`mt_id`	`uint(8)`
`weight`	`uint(8)`
`neighbor_id`	`ipv4`
`label`	`uint(24)`

tlvs › extended_link › sub_tlvs › lan_adj_sid › flags

Bit	Mask	Name
7	128 (0x80)	`b`
6	64 (0x40)	`v`
5	32 (0x20)	`l`
4	16 (0x10)	`g`
3	8 (0x08)	`p`

`tlvs` › `extended_link` › `sub_tlvs` › `lan_adj_sid_index`

Field	Type	Default	Auto	Description
`flags`	`flags(8)`
`reserved`	`uint(8)`
`mt_id`	`uint(8)`
`weight`	`uint(8)`
`neighbor_id`	`ipv4`
`index`	`uint(32)`

tlvs › extended_link › sub_tlvs › lan_adj_sid_index › flags

Bit	Mask	Name
7	128 (0x80)	`b`
6	64 (0x40)	`v`
5	32 (0x20)	`l`
4	16 (0x10)	`g`
3	8 (0x08)	`p`

Sample templates

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