Logical ports are used in OpenFlow to encode switch-specific ports. SR OS H-OFS uses logical ports in steering actions by encoding PBR targets. Table: Encoding and supported logical port types lists logical port types supported by SR OS H-OFS:
| Bits 31..28 | Bits 27..24 | Bits 24..0 |
|---|---|---|
Logical port type (LPT) |
Logical port type sub-type (LPT-S) |
Logical port type value (LPT-V) — always padded with leading zeros |
The following encoding example shows logical port types supported by SR OS H-OFS:
RSVP LSP: LPT: 0100, LPT-S: 0000 (tunnel), LPT-V: RSVP TE Tunnel ID
MPLS-TP LSP: LPT: 0100, LPT-S: 0000 (tunnel), LTP-V: MPLS-TP Tunnel Number
SR-TE LSP: LPT: 0100, LPT-S: 0000 (tunnel), LTP-V: SR-TE LSP Index
GRT instance: LPT: 0100, LPT-S: 0001 (L3 routing instance), LPT-V: 0
VPRN Id: LPT: 0100, LPT-S: 0001 (L3 routing instance), LPT-V: VPRN Service ID for a
VPRN instance configured on the system, NAT: LPT 0100, LPT-S: 0020 (NAT), LPT-V: 0
OF is limited to a 24-bit service ID value range (a subset of VPRN IDs supported by the SR OS system).
Logical port values other than RSVP-TE LSP, SR-TE LSP, and MPLS-TP LSP require H-OFS with the switch-defined-cookie command enabled. Only tunnel-encoded ports are stored in the H-OFS logical port table. Therefore, functionality such as retrieving statistics per port is not available for logical ports that are not stored in the H-OFS logical port table.