| Internet-Draft | IfStackTable for P2poverLAN interface | February 2022 |
| Liu, et al. | Expires 11 August 2022 | [Page] |
[RFC5309] defines the Point-to-Point (P2P) circuit type, one of the two circuit types used in the link state routing protocols, and highlights that it is important to identify the correct circuit type when forming adjacencies, flooding link state database packets, and monitoring the link state.¶
The P2P interface over LAN ifType value 303, has been assigned by IANA Expert Review, and this document requests IANA to add this document as a reference to ifType 303. This document provides advice about the ifStack for the P2P interface over LAN ifType to facilitate operational control, maintenance and statistics.¶
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[RFC5309] defines the P2P circuit type and highlights that it is important to identify the correct circuit type when forming adjacencies, flooding link state database packets, and monitoring the link state.¶
The assignment of 303, as the value for p2pOverLan ifType was made by Expert Review [Assignment]. This document requests IANA to add this document as a reference to ifType 303.¶
To simplify configuration and operational control, it is helpful to represent the fact that an interface is to be considered a P2P interface over LAN type explicitly in the interface stack. This enables, for example, routing protocols to automatically inherit the correct operating mode from the interface stack without further configuration (No need to explicitly configure the P2P interface in routing protocols).¶
It is helpful to map the P2P interface over LAN type in the interface management stack table. And if no entry specifies the P2P interface lower layer, the management suffers loses the ability to get to the lower layer specific management properties via many tools.¶
The purpose of this document is to suggest how to use ifStackTable for the P2P interface over LAN type, and provide examples.¶
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119] [RFC8174].¶
If a device implements the IF-MIB [RFC2863], each entry in the "/interfaces/interface" list (in "Interface Management YANG") in the operational state is typically mapped to one ifEntry as required in [RFC8343], therefore the P2P interface over LAN type should also be fully mapped to one ifEntry by defining the "ifStackTable" ("higher-layer-if" and "lower-layer-if").¶
The P2P interface higher layer should be network layer "ipForward" (defined in IANA) to run routing protocol, the P2P interface lower layer is link data layer "ethernetCsmacd" (defined in IANA).¶
The P2P interface type ifStackTable can be defined along the lines of following example which complies with [RFC8343] [RFC6991] [RFC8340]:¶
<interface>
<name>isis_int</name>
<type>ianaift:ipForward</type>
</interface>
<interface>
<name>eth1</name>
<type>ianaift:ethernetCsmacd</type>
</interface>
<interface>
<name>p2p</name>
<type>ianaift:p2pOverLan</type>
<higher-layer-if>isis_int</higher-layer-if>
<lower-layer-if>eth1</lower-layer-if>
<enabled>false</enabled>
<admin-status>down</admin-status>
<oper-status>down</oper-status>
<statistics>
<discontinuity-time>
2021-04-01T03:00:00+00:00
</discontinuity-time>
<!-- counters now shown here -->
</statistics>
</interface>
The interface stack table specified in this document is read-only. Read operation to this table should not have a negative effect on network operations.¶
In the Interface Types registry, IANA has been assigned a value of 303 for p2pOverLan [Assignment] with a reference of [RFC5309]. IANA is requested to amend the reference for that code point to be to this document and to make a similar amendment in the YANG iana-if-type module [RFC7224] which currently points to [RFC8561], as this document explains how the ifType is to be used.¶