Babel routing protocol B. Stark
Internet-Draft AT&T
Intended status: Informational March 13, 2017
Expires: September 14, 2017
Babel Information Model
draft-stark-babel-information-model-01
Abstract
This Babel Information Model can be used to create data models under
various data modeling regimes (e.g., YANG). It allows a Babel
implementation (via a management protocol such as netconf) to report
on its current state and may allow some limited configuration of
protocol constants.
Status of This Memo
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This Internet-Draft will expire on September 14, 2017.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 2
1.2. Notation . . . . . . . . . . . . . . . . . . . . . . . . 3
2. The Information Model . . . . . . . . . . . . . . . . . . . . 3
2.1. Definition of babel-information . . . . . . . . . . . . . 3
2.2. Definition of babel-constants . . . . . . . . . . . . . . 4
2.3. Definition of babel-interfaces . . . . . . . . . . . . . 5
2.4. Definition of babel-neighbors . . . . . . . . . . . . . . 5
2.5. Definition of babel-csa . . . . . . . . . . . . . . . . . 6
2.6. Definition of babel-sources . . . . . . . . . . . . . . . 6
2.7. Definition of babel-routes . . . . . . . . . . . . . . . 7
3. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1. Normative References . . . . . . . . . . . . . . . . . . 8
3.2. Informative References . . . . . . . . . . . . . . . . . 8
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
Babel is a loop-avoiding distance-vector routing protocol defined in
RFC 6126 [RFC6126]. Babel Hashed Message Authentication Code (HMAC)
Cryptographic Authentication, defined in RFC 7298 [RFC7298],
describes a cryptographic authentication mechanism for the Babel
routing protocol. This document describes an information model for
Babel (including HMAC) that can be used to created management
protocol data models (such as a netconf [RFC6241] YANG data model).
Other Babel extensions may be included in this document when they
become working group drafts.
Due to the simplicity of the Babel protocol and the fact that it is
designed to be used in non-professionally administered environments
(such as home networks), most of the information model is focused on
reporting status of the Babel protocol, and very little of that is
considered mandatory to implement (conditional on a management
protocol with Babel support being implemented). Some parameters may
be configurable; however, it is up to the Babel implementation
whether to allow any of these to be configured within its
implementation. Where the implementation does not allow
configuration of these parameters, it may still choose to expose them
as read-only.
1.1. Requirements Language
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 RFC 2119 [RFC2119].
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1.2. Notation
This document uses a programming language-like notation to define the
properties of the objects of the information model. An optional
property is enclosed by square brackets, [ ], and a list property is
indicated by two numbers in angle brackets, <m..n>, where m indicates
the minimal number of values, and n is the maximum. The symbol * for
n means no upper bound.
2. The Information Model
2.1. Definition of babel-information
object {
string babel-version;
int babel-self-router-id;
[int babel-self-seqno;]
string babel-cost-comp-algorithms<1..*>;
babel-constants-obj babel-constants;
babel-interfaces-obj babel-interfaces<0..*>;
babel-sources-obj babel-sources<0..*>;
babel-routes-obj babel-routes<0..*>;
}babel-information-obj;
babel-version: the version of this implementation of the Babel
protocol
babel-self-router-id: the router-id used by this instance of the
Babel protocol to identify itself
babel-self-seqno: the current sequence number included in route
updates for routes originated by this node
babel-cost-comp-algorithm: a set of names of supported cost
computation algorithms; possible values include "k-out-of-j",
"ETX"
babel-constants: a babel-constants object
babel-interfaces: a set of babel-interface objects
babel-sources: a set of babel-source objects
babel-routes: a set of babel-route objects
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2.2. Definition of babel-constants
object {
int babel-udp-port;
[int babel-multicast-group;]
}babel-constants-obj;
babel-udp-port: UDP port for sending and listening for Babel
messages; MAY be configurable
babel-hello-interval-lossy: Hello Interval default for lossy links
in milliseconds; MAY be configurable
babel-hello-interval-lossless: Hello Interval default for lossless
links in milliseconds; MAY be configurable
babel-ihu-interval: IHU Interval default as multiples of Hello
interval
babel-update-interval: Update Interval default as multiples of
Hello interval
babel-ihu-hold-time: IHU Hold Time default as multiples of Hello
interval
babel-route-expiry-time: IHU Interval default as multiples of
Hello interval
babel-garbage-collection-time: Garbage Collection time default as
multiples of Update interval
babel-max-trigger-delay: Maximum delay to wait before sending a
triggered update in milliseconds
babel-max-normal-delay: Maximum delay to wait before sending a
non-triggered message in milliseconds
babel-ack-limit: Threshold for requesting acknowledgements on an
interface (do not request acknowledgements if there are more than
this many neighbors on the interface); MAY be configurable
babel-resend-trigger-lossy-limit: Resend limit of triggered
updates on lossy links (can this be the same, whether or not
acknowledgements are requested?)
babel-resend-trigger-lossless-limit: Resend limit of triggered
updates on lossless links (can this be the same, whether or not
acknowledgements are requested?)
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babel-resend-normal-lossy-limit: Resend limit of normal messages
on lossy links
babel-resend-normal-lossless-limit: Resend limit of normal
messages on lossless links
2.3. Definition of babel-interfaces
object {
uri babel-interface-reference;
[int babel-interface-seqno;]
[int babel-interface-hello-interval;]
[int babel-interface-update-interval;]
boolean babel-request-trigger-ack;
boolean babel-lossy-link;
[int babel-external-cost;]
babel-neighbors-obj babel-neighbors<1..*>;
[babel-csa-obj babel-csa<1..*>;]
}babel-interfaces-obj;
babel-interface-reference: reference to an interface object as
defined by the data model
babel-interface-seqno: the current sequence number in use for this
interface
babel-interface-hello-interval: the current hello interval in use
for this interface
babel-interface-update-interval: the current update interval in
use for this interface
babel-request-trigger-ack: requests acknowledgement of triggered
updates (if number of neighbors less than babel-ack-limit); MAY be
configurable
babel-lossy-link: indicates (if true) that the link of this
interface is considered lossy; MAY be configurable
babel-external-cost: external input to cost of link of this
interface (need to determine how to express this);MUST be
configurable if implemented
2.4. Definition of babel-neighbors
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object {
some address format babel-neighbor-address;
string babel-hello-history;
int babel-txcost;
int babel-hello-seqno;
int babel-neighbor-ihu-interval;
[int babel-rxcost]
}babel-neighbors-obj;
babel-neighbor-address: (IPv4 or v6) address the neighbor sends
messages from
babel-hello-history: the Hello history (do we want a human
readable format?)
babel-txcost: transmission cost value from the last IHU packet
received from this neighbor, or FFFF hexadecimal (infinity) if the
IHU hold timer for this neighbor has expired
babel-hello-seqno: expected Hello sequence number
babel-neighbor-ihu-interval: current IHU interval for this
neighbor
babel-router-id: router-id of the neighbor
babel-rxcost: reception cost calculated for this neighbor
2.5. Definition of babel-csa
object {
string placeholder;
}babel-csa-obj;
placeholder: this section to be filled in, in the future
2.6. Definition of babel-sources
object {
(prefix, plen) babel-source-prefix;
int babel-source-router-id;
int babel-source-seqno;
int babel-source-metric;
[int babel-source-garbage-collection-time;]
}babel-sources-obj;
babel-source-prefix: Prefix (with prefix length)
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babel-source-router-id: router-id of the router originating this
prefix
babel-source-seqno: last sequence number used by this source
babel-source-metric: this source's feasibility distance
babel-source-garbage-collection-time: garbage-collection timer for
this source
2.7. Definition of babel-routes
object {
(prefix, plen) babel-route-prefix;
int babel-route-router-id;
int babel-route-neighbor;
int babel-route-metric;
int babel-route-seqno;
ip address babel-route-next-hop;
boolean babel-route-selected;
}babel-routes-obj;
babel-route-prefix: Prefix (with prefix length) for which this
route is advertised
babel-route-router-id: router-id of the router originating this
prefix
babel-route-neighbor: neighbor that advertised this route (is this
a router-id ?)
babel-route-metric: the metric with which this route was
advertised by the neighbor, or FFFF hexadecimal (infinity) for a
recently retracted route
babel-route-seqno: the sequence number with which this route was
advertised
babel-route-next-hop: the next-hop address of this route
babel-route-selected: a boolean flag indicating whether this route
is selected, i.e., whether it is currently being used for
forwarding and is being advertised
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3. References
3.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
3.2. Informative References
[RFC6126] Chroboczek, J., "The Babel Routing Protocol", RFC 6126,
DOI 10.17487/RFC6126, April 2011,
<http://www.rfc-editor.org/info/rfc6126>.
[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
<http://www.rfc-editor.org/info/rfc6241>.
[RFC7298] Ovsienko, D., "Babel Hashed Message Authentication Code
(HMAC) Cryptographic Authentication", RFC 7298,
DOI 10.17487/RFC7298, July 2014,
<http://www.rfc-editor.org/info/rfc7298>.
Author's Address
Barbara Stark
AT&T
Atlanta, GA
US
Email: barbara.stark@att.com
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