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Network Working Group R. Bush Network Working Group R. Bush
Internet-Draft Arrcus & Internet Initiative Japan Internet-Draft Arrcus & Internet Initiative Japan
Intended status: Standards Track R. Austein Intended status: Standards Track R. Austein
Expires: November 26, 2020 K. Patel Expires: January 30, 2021 K. Patel
Arrcus Arrcus
May 25, 2020 July 29, 2020
Layer 3 Discovery and Liveness Layer 3 Discovery and Liveness
draft-ietf-lsvr-l3dl-05 draft-ietf-lsvr-l3dl-06
Abstract Abstract
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time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 26, 2020. This Internet-Draft will expire on January 30, 2021.
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Copyright Notice Copyright Notice
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Internet-Draft Layer 3 Discovery and Liveness May 2020 Internet-Draft Layer 3 Discovery and Liveness July 2020
19. VLANs/SVIs/Sub-interfaces . . . . . . . . . . . . . . . . . . 29 19. VLANs/SVIs/Sub-interfaces . . . . . . . . . . . . . . . . . . 29
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o Provide for authenticity verification of protocol messages. o Provide for authenticity verification of protocol messages.
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MTU: Maximum Transmission Unit, the size in octets of the MTU: Maximum Transmission Unit, the size in octets of the
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4. Top Level Overview 4. Top Level Overview
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o Encapsulation data are exchanged and IP-Level Liveness checks o Encapsulation data are exchanged and IP-Level Liveness checks
enabled enabled
o A BGP-like upper layer protocol is assumed to use the identiiers o A BGP-like upper layer protocol is assumed to use the identifiers
and encapsulation data to discover and build a topology database and encapsulation data to discover and build a topology database
+-------------------+ +-------------------+ +-------------------+ +-------------------+ +-------------------+ +-------------------+
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There are two protocols, the inter-device (left-right in the diagram) There are two protocols, the inter-device (left-right in the diagram)
per-link layer 3 discovery and the API to the upper level BGP-like per-link layer 3 discovery and the API to the upper level BGP-like
routing prototol (up-down in the above diagram): routing protocol (up-down in the above diagram):
o Inter-device PDUs are used to exchange device and logical link o Inter-device PDUs are used to exchange device and logical link
identities and layer 2.5 (MPLS) and 3 identifiers (not payloads), identities and layer 2.5 (MPLS) and 3 identifiers (not payloads),
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o A Link Layer to BGP API presents these data up the stack to a BGP o A Link Layer to BGP API presents these data up the stack to a BGP
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the source MAC addresses (plus VIDs if VLANs) of the received HELLOs. the source MAC addresses (plus VIDs if VLANs) of the received HELLOs.
Once a session is established through the OPEN exchange, the Once a session is established through the OPEN exchange, the
Encapsulations (Section 13) configured on an end point may be Encapsulations (Section 13) configured on an end point may be
announced and modified. Note that these are only the encapsuation announced and modified. Note that these are only the encapsulation
and addresses configured on the announcing interface; though a and addresses configured on the announcing interface; though a
device's loopback and overlay interface(s) may also be announced. device's loopback and overlay interface(s) may also be announced.
When two devices on a link have compatible Encapsulations and When two devices on a link have compatible Encapsulations and
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| HELLO | Mandatory | HELLO | Mandatory
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| Interface MPLSv6 Labels | Interface MPLSv6 Labels | Interface MPLSv6 Labels | Interface MPLSv6 Labels
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no intermediate devices capable of further fragmentation or no intermediate devices capable of further fragmentation or
reassembly. reassembly.
A PDU might need a large number of frames to be sent. As fragments
are not ACK paced (as PDUs are), to avoid overwhelming bursts, the
sender should pace fragments of a large PDU.
L3DL is carrying relatively small amounts of data on relatively high L3DL is carrying relatively small amounts of data on relatively high
bandwidth links, and at a time when the link is not active with other bandwidth links, and at a time when the link is not active with other
data as it does not yet have layer three connectivity. So congestion data as it does not yet have layer three connectivity. So congestion
is not considered a sufficiently significant risk to warrent is not considered a sufficiently significant risk to warrant
additional complexity. additional complexity.
Should a PDU need to be retransmitted, it MUST BE sent as the Should a PDU need to be retransmitted, it MUST BE sent as the
identical Datagram set as the original transmission. The identical Datagram set as the original transmission. The
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Transmission Sequence Number informs the receiver that it is the same Transmission Sequence Number informs the receiver that it is the same
PDU. PDU.
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0 1 2 3 0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Transmission Sequence Number |L| ~ | Version | Transmission Sequence Number |L| Dtgm Number ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Datagram Number | Datagram Length | ~ Datagram Number (contd) | Datagram Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Checksum | | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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The fields of the L3DL Transport Header are as follows: The fields of the L3DL Transport Header are as follows:
Version: Seven-bit Version number of the protocol, currently 0. Version: Eight-bit Version number of the protocol, currently 0.
Values other than 0 MUST BE treated as an error. The protocol Values other than 0 MUST BE treated as an error. The protocol
version needs to be in one and only one place, so it is in the version needs to be in one and only one place, so it is in the
datagram as opposed to, for example, the PDU header. datagram as opposed to, for example, the PDU header.
L: A bit that set to one if this Datagram is the last Datagram of the
PDU. For a PDU which fits in only one Datagram, it is set to one.
Note that this is the inverse of the marking technique used by
[RFC0791].
Transmission Sequence Number: A 16-bit strictly increasing unsigned Transmission Sequence Number: A 16-bit strictly increasing unsigned
integer identifying this PDU, possibly across retransmissions, integer identifying this PDU, possibly across retransmissions,
that wraps from 2^16-1 to 0. The initial value is arbitrary. See that wraps from 2^16-1 to 0. The initial value is arbitrary. See
[RFC1982] on DNS Serial Number Arithmetic for too much detail on [RFC1982] on DNS Serial Number Arithmetic for too much detail on
comparing and incrementing a wrapping sequence number. comparing and incrementing a wrapping sequence number.
Datagram Number: A monotonically increasing 24-bit value which L: A bit that set to one if this Datagram is the last Datagram of the
PDU. For a PDU which fits in only one Datagram, it is set to one.
Note that this is the inverse of the marking technique used by
[RFC0791].
Datagram Number: A monotonically increasing 23-bit value which
starts at zero for each PDU. This is used to reassemble frames starts at zero for each PDU. This is used to reassemble frames
into PDUs a la [RFC0791] Section 2.3. Note that this limits an into PDUs a la [RFC0791] Section 2.3. Note that this limits an
L3DL PDU to 2^24 frames. L3DL PDU to 2^24 frames.
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Checksum: A 32 bit hash over the Datagram to detect bit flips, see Checksum: A 32 bit hash over the Datagram to detect bit flips, see
Section 7. Section 7.
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If a Datagram fails checksum verification, the datagram is invalid If a Datagram fails checksum verification, the datagram is invalid
and should be silently discarded. The sender will retransmit the and should be silently discarded. The sender will retransmit the
PDU, and the receiver can assmble it. PDU, and the receiver can assemble it.
Payload: The PDU being transported or a fragment thereof. Payload: The PDU being transported or a fragment thereof.
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To avoid the need for a receiver to reassemble two PDUs at the same To avoid the need for a receiver to reassemble two PDUs at the same
time, a sender MUST NOT send a subsequent PDU when a PDU is already time, a sender MUST NOT send a subsequent PDU when a PDU is already
in flight and not yet acknowledged; assuming it is an ACKed PDU Type. in flight and not yet acknowledged; assuming it is an ACKed PDU Type.
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<CODE BEGINS> <CODE BEGINS>
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8. TLV PDUs 8. TLV PDUs
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9. Logical Link Endpoint Identifier 9. Logical Link Endpoint Identifier
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For a layer 3 tagged sub-interface or a VLAN/SVI interface, Ifindex For a layer 3 tagged sub-interface or a VLAN/SVI interface, Ifindex
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0 1 2 3 0 1 2 3
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0 1 2 3 0 1 2 3
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The Key is specific to the operational environment. A failure to The Key is specific to the operational environment. A failure to
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Although delay and jitter in responding with an OPEN were specified Although delay and jitter in responding with an OPEN were specified
above, beware of load created by long strings of authentication above, beware of load created by long strings of authentication
failures and retries. failures and retries. A configurable failure count limit (default 8)
SHOULD result in giving up on the connection attempt.
The Serial Number is that of the last received and processed PDU. The Serial Number is that of the last received and processed PDU.
This allows a receiver sending an OPEN to tell the sender that the This allows a receiver sending an OPEN to tell the sender that the
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12. ACK 12. ACK
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The Signature fields are described in Section 8. The Signature fields are described in Section 8.
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13.1. The Encapsulation PDU Skeleton 13.1. The Encapsulation PDU Skeleton
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(default three), the L3DL session should be considered dead and the (default three), the L3DL session should be considered dead and the
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0 1 2 3 0 1 2 3
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The 24-bit Count is the sum of the number of IPv6 Encapsulations The 24-bit Count is the sum of the number of IPv6 Encapsulations
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The MPLS IPv4 Encapsulation describes a logical link's ability to The MPLS IPv4 Encapsulation describes a logical link's ability to
exchange labeled IPv4 packets on one or more subnets. It does so by exchange labeled IPv4 packets on one or more subnets. It does so by
stating the interface's addresses the corresponding prefix lengths, stating the interface's addresses the corresponding prefix lengths,
and the corresponding labels which will be accepted fpr each address. and the corresponding labels which will be accepted for each address.
0 1 2 3 0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The 24-bit Count is the sum of the number of MPLSv4 Encapsulation The 24-bit Count is the sum of the number of MPLSv4 Encapsulation
being announced and/or withdrawns. being announced and/or withdrawn.
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13.7. MPLS IPv6 Encapsulation 13.7. MPLS IPv6 Encapsulation
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0 1 2 3 0 1 2 3
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KEEPALIVEs SHOULD be beaconed at a configured frequency. One per KEEPALIVEs SHOULD be beaconed at a configured frequency. One per
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17.1. Use BGP-LS as Much as Possible 17.1. Use BGP-LS as Much as Possible
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18.2. HELLO versus KEEPALIVE 18.2. HELLO versus KEEPALIVE
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21. Security Considerations 21. Security Considerations
The protocol as is MUST NOT be used outside a datacenter or similarly The protocol as is MUST NOT be used outside a datacenter or similarly
closed environment without authentication ans authorisation closed environment without authentication and authorization
mechanisms such as [I-D.ymbk-lsvr-l3dl-signing]. mechanisms such as [I-D.ymbk-lsvr-l3dl-signing].
Many MDC operators have a strange belief that physical walls and Many MDC operators have a strange belief that physical walls and
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PDU PDU
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per [RFC5226], either standards track or experimental. The initial per [RFC5226], either standards track or experimental. The initial
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[I-D.ietf-lsvr-bgp-spf] [I-D.ietf-lsvr-bgp-spf]
Patel, K., Lindem, A., Zandi, S., and W. Henderickx, Patel, K., Lindem, A., Zandi, S., and W. Henderickx,
"Shortest Path Routing Extensions for BGP Protocol", "Shortest Path Routing Extensions for BGP Protocol",
draft-ietf-lsvr-bgp-spf-09 (work in progress), May 2020. draft-ietf-lsvr-bgp-spf-10 (work in progress), July 2020.
[I-D.ymbk-lsvr-l3dl-signing] [I-D.ymbk-lsvr-l3dl-signing]
Bush, R. and R. Austein, "Layer 3 Discovery and Liveness Bush, R. and R. Austein, "Layer 3 Discovery and Liveness
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[RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A
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[RFC0791] Postel, J., "Internet Protocol", STD 5, RFC 791, [RFC0791] Postel, J., "Internet Protocol", STD 5, RFC 791,
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