| Internet-Draft | YANG Data Model for the IS-IS Reverse Metric Extension | March 2019 |
| Hopps | Expires 2 October 2019 | [Page] |
This document defines a YANG module for managing the reverse metric extension to the the intermediate system to intermediate system routeing protocol.¶
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Copyright (c) 2019 IETF Trust and the persons identified as the document authors. All rights reserved. ¶
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This document defines a YANG module for managing the reverse metric extension to the intermediate system to intermediate system routeing protocol (IS-IS) [RFC8500], [ISO10589]. Please refer to [RFC8500] for the description and definition of the functionality managed by this module.¶
The YANG data model described in this document conforms to the Network Management Datastore Architecture defined in [RFC8342].¶
The following is the YANG tree diagram ([RFC8340]) for the IS-IS reverse metric extension additions.¶
module: ietf-isis-reverse-metric
augment /rt:routing/rt:control-plane-protocols
/rt:control-plane-protocol/isis:isis/isis:interfaces
/isis:interface:
+--rw reverse-metric
+--rw reverse-metric
| +--rw metric? isis:wide-metric
| +--rw flags? bits
+--rw exclude-te-metric? boolean
augment /rt:routing/rt:control-plane-protocols
/rt:control-plane-protocol/isis:isis/isis:interfaces
/isis:interface/isis:adjacencies/isis:adjacency:
+--ro reverse-metric
| +--ro metric? isis:wide-metric
| +--ro flags? bits
+--ro te-metric? uint32
¶
The following is the YANG module for managing the IS-IS reverse metric functionality defined in [RFC8500].¶
<CODE BEGINS> file "ietf-isis-reverse-metric@2019-03-31.yang"
module ietf-isis-reverse-metric {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-isis-reverse-metric";
prefix isis-rmetric;
import ietf-isis { prefix isis; }
import ietf-routing { prefix "rt"; }
organization
"IETF NETMOD Working Group (NETMOD)";
contact
"WG Web: <https://tools.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
Author: Christian Hopps
<mailto:chopps@chopps.org>";
// RFC Ed.: replace XXXX with actual RFC number and
// remove this note.
description
"This module defines the configuration and operational state for
managing the IS-IS reverse metric functionality [RFC8500].
Copyright (c) 2019 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject to
the license terms contained in, the Simplified BSD License set
forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://tools.ietf.org/html/rfcXXXX); see the RFC itself for
full legal notices.";
revision 2019-03-31 {
description "Initial Revision";
reference "RFC XXXX: YANG IS-IS Reverse Metric";
}
grouping reverse-metric-data {
description "IS-IS reverse metric data.";
container reverse-metric {
description "IS-IS reverse metric data.";
leaf metric {
type isis:wide-metric;
description "The reverse metric value.";
}
leaf flags {
type bits {
bit whole-lan {
position 0;
description
"The 'whole LAN' or W-bit. If true then a DIS
processing this reverse metric will add the metric
value to all the nodes it advertises in the
pseudo-node LSP for this interface. Otherwise it will
only increment the metric for the advertising node in
the pseudo-node LSP for this interface.";
}
bit allow-unreachable {
position 1;
description
"The 'allow-unreachable' or U-bit. If true it allows
the neighbor to increment the overall metric up to
2^24-1 rather than the lesser maximum of 2^24-2, and
if done will cause traffic to stop using rather than
avoid using the interface.";
}
}
description "The reverse metric flag values.";
}
}
}
grouping tlv16-reverse-metric {
description "IS-IS reverse metric TLV data.";
uses reverse-metric-data;
leaf te-metric {
type uint32;
description "The TE metric value from the sub-TLV if present.";
}
}
augment "/rt:routing/rt:control-plane-protocols/"
+"rt:control-plane-protocol/"
+"isis:isis/isis:interfaces/isis:interface" {
when "rt:type = 'isis:isis'" {
description
"This augment is only valid when routing protocol instance
type is 'isis'.";
}
description
"The reverse metric configuration for an interface.";
container reverse-metric {
description "Announce a reverse metric to neighbors.";
uses reverse-metric-data;
leaf exclude-te-metric {
type boolean;
default false;
description
"If true and there is a TE metric defined for this
interface then do not send the TE metric sub-TLV in the
reverse metric TLV.";
}
}
}
augment "/rt:routing/rt:control-plane-protocols/"
+"rt:control-plane-protocol/"
+"isis:isis/isis:interfaces/isis:interface/"
+"isis:adjacencies/isis:adjacency" {
when "rt:type = 'isis:isis'" {
description
"This augment is only valid when routing protocol instance
type is 'isis'";
}
description
"The reverse metric state advertised by a neighbor.";
uses tlv16-reverse-metric;
}
}
<CODE ENDS>
¶
This document registers a URI in the "IETF XML Registry" [RFC3688]. Following the format in [RFC3688], the following registration has been made:¶
This document registers one YANG module in the "YANG Module Names" registry [RFC6020]. Following the format in [RFC6020], the following registration has been made:¶
The YANG module specified in this document defines a schema for data that is designed to be accessed via network management protocols such as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS [RFC8446].¶
The Network Configuration Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content.¶
The YANG module defined in this document can enable, disable and modify the behavior of metrics used by routing. For the security implications regarding these types of changes consult the [RFC8500] which defines the functionality.¶