Internet DRAFT - draft-hu-nfvrg-cu-separation-yang-model
draft-hu-nfvrg-cu-separation-yang-model
NFVRG Fangwei. Hu
Internet-Draft RongRong. Hua
Intended status: Informational ZTE Corporation
Expires: October 22, 2017 Shujun. Hu
Lu. Huang
China Mobile
April 20, 2017
YANG Data Model for Configuration Interface of Control-Plane and User-
Plane separation BNG
draft-hu-nfvrg-cu-separation-yang-model-00.txt
Abstract
This document defines the YANG data model for operation management of
Control-Plane and User-Plane separation BNG.
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This Internet-Draft will expire on October 22, 2017.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Concept and Terminology . . . . . . . . . . . . . . . . . . . 4
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
3. Information model . . . . . . . . . . . . . . . . . . . . . . 4
3.1. overview . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2. vBRAS interface configuration . . . . . . . . . . . . . . 4
3.3. Controller channel configuration . . . . . . . . . . . . 5
3.4. Acl Configuration . . . . . . . . . . . . . . . . . . . . 5
3.5. QoS Configuration . . . . . . . . . . . . . . . . . . . . 6
4. vBRAS YANG Data Model . . . . . . . . . . . . . . . . . . . . 6
5. Security Considerations . . . . . . . . . . . . . . . . . . . 10
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
8.1. Normative References . . . . . . . . . . . . . . . . . . 11
8.2. Informative References . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
Cloud-based BNG with C/U separated conception is raised
[I-D.gu-nfvrg-cloud-bng-architecture]. The main idea of Control-
Plane and User-Plane separation method is to extract and centralize
the user management functions of multiple BNG devices, forming an
unified and centralized control plane (CP), while the traditional
router's Control Plane and forwarding plane are both preserved on BNG
devices in the form of a user plane (UP).
The architecture of C/U separated BRAS is shown as the following
figure[I-D.huang-nvo3-vxlan-extension-for-vbras].
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+----------------------------------+
| |
| BRAS-CP |
| |
+--+--------------+--------------+-+
| | |
Signaling | Management | Configuration|
Interface | Interface | Interface |
| | | | | |
VxLAN | OpenFlow | NETCONF |
| | |
+--+--------------+--------------+-+
| |
| BRAS-UP |
| |
+-----------------+----------------+
|
|
+--------+--------+
| |
| Access Network |
| |
+--------+--------+
|
+----+----+
| |
| User |
| |
+---------+
Figure 1: Architecture of C/U separated vBRAS
There are three interfaces between BRAS-CP and BRAS-UP: Signaling
interface , Configuration interface and management interface. The
signaling interface is used to carry PPPoE/IPoE signaling packets
between user plane and control plane. The requirement and possible
solution is defined in the
[I-D.huang-nvo3-vxlan-extension-for-vbras]. Management interface is
used for seting forwarding entries of user plane through OpenFlow
[I-D.wcg-i2rs-cu-separation-infor-model]. Configuration interface is
used by CP to carry out basic configurations of user plane through
NETCONF. The YANG data model about the configuration information is
defined in this document.
Though BRAS-CP and BRAS-UP are connected with network management,
most of the configuration information for BRAS-UP are through the
BRAS-CP by netconf protocol[RFC6241], which simplifies the
implementation of BRAS-UP in the C/U separated BNG architecture.
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Very few configuration parameters (such as IP address for netconf
protocol) for BRAS-UP are configured through the network management
directly.
2. Concept and Terminology
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].
2.1. Terminology
BNG: Broadband Network Gateway. A broadband remote access server
(BRAS, B-RAS or BBRAS) routes traffic to and from broadband remote
access devices such as digital subscriber line access multiplexers
(DSLAM) on an Internet service provider's (ISP) network. BRAS can
also be referred to as a Broadband Network Gateway (BNG).
CP: Control Plane. The CP is a user control management component
which support to manage UP's resources such as the user entry and
forwarding policy.
UP: User Plane. UP is a network edge and user policy implementation
component.
3. Information model
3.1. overview
The vBRAS UP or CP part can be a physical or logical network element.
We augment [I-D.ietf-rtgwg-lne-model] to define the information model
for vBRAS CP and UP.
module: ietf-vbras
augment /lne:logical-network-elements/lne:logical-network-element:
+--rw ietf-vbras
+--rw vbras-name? string
3.2. vBRAS interface configuration
The vBRAS interface configuration is to cofigure the basic interface
informations of vBRAS UP element, such as interface name, the VLAN
parameters for the sub-interface.
The tree structure for vBRAS interface configuration is as following:
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+--rw interfaces
| +--rw interface* [name]
| +--rw name if:interface-ref
| +--rw ethernet
| | +--rw lacp? boolean
| +--rw mac-offset? uint32
| +--rw vlans
| +--rw tag* [index]
| +--rw index uint8
| +--rw tag
| +--rw tag-type? string
| +--rw vlan-id? vlan-id
3.3. Controller channel configuration
The controller channel configuration is to configure the OpenFlow
channel parameters and the VXLAN tunnel parameters.
The OpenFlow channel parameters include: ofls-name, dpid, of-port.
The tree structure for OpenFlow channel configuration parameters are
as following:
+--rw openflow-channel
| +--rw ofls-name? string
| +--rw dpid? uint32
| +--rw of-port? uint32
It is suggestion that the static VXLAN tunnel used for vBRAS CP and
UP. The VXLAN tunnel parameters include: tunnel-source-ip,tunnel-
destination-ip, vxlan-id, vxlan-tunnel-id, vxlan-tunnel-name,etc.
+--rw vxlan-channel* [vxlan-tunnel-id]
+--rw vxlan-tunnel-id uint32
+--rw vxlan-tunnel-name? string
+--rw address-family* [af]
+--rw af address-family-type
+--rw tunnel-source-ip? address-family-type
+--rw tunnel-destination-ip? address-family-type
+--rw bind-vxlan-id* [vxlan-id]
+--rw vxlan-id vxlan-id
3.4. Acl Configuration
The acl information for BRAS-UP is configured through netconf from
BRAS-CP. The ACL information includes ipv4-acl,ipv6-acl,link-
acl,etc. The YANG data model for ACL can refer to
[I-D.ietf-netmod-acl-model]
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3.5. QoS Configuration
The QoS information for BRAS-UP is also configured through netconf
from BRAS-CP. The vBRAS support QoS information includes IP-DSCP,
MPLS,VPLS, VPWS etc. The YANG data model for QoS refer to
[I-D.chen-rtgwg-qos-yang]
4. vBRAS YANG Data Model
<CODE BEGINS> file "ietf-vbras@2017-04-15.yang"
module ietf-vbras{
namespace "urn:ietf:params:xml:ns:yang:ietf-vbras";
prefix "vbras";
import ietf-interfaces {
prefix if;
}
import ietf-logical-network-element {
prefix lne;
}
/*
import ietf-yang-types {
prefix yang;
}
*/
organization
"IETF NETCONF Working Group";
contact
"
WG List: <mailto:netconf@ietf.org>
Editor: Fangwei Hu
<mailto:hu.fangwei@zte.com.cn>
";
description
"The YANG module defines a generic configuration
model for vbras";
revision 2017-04-13 {
description "Initial revision";
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reference
"draft-hu-nfvrg-cu-separation-yang-model-00";
}
/* Typedefs */
typedef vlan-id {
type uint16 {
range "0..4094";
}
description
"Typedef for VxLAN ID.";
}
typedef vxlan-id {
type uint32;
description
"Typedef for VxLAN ID.";
}
typedef address-family-type {
type enumeration {
enum ipv4 {
description
"IPv4";
}
enum ipv6 {
description
"IPv6";
}
}
description
"Typedef for address family type.";
}
/* Configuration Data */
augment /lne:logical-network-elements/lne:logical-network-element {
container ietf-vbras{
leaf vbras-name {
type string;
description "configure vbras name";
}
container interfaces {
list interface {
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key name;
leaf name {
type if:interface-ref;
description "interface name";
}
container ethernet {
leaf lacp {
type boolean;
description "enable lacp function";
}
description "configure ethernet interface";
}
leaf mac-offset {
type uint32;
description "configure mac offset";
}
container vlans {
list tag {
key index;
max-elements 2;
leaf index {
type uint8 {
range "0..1";
}
must ". = 0 or
count(../../tag[index = 0]/index) > 0" {
error-message "An inner tag can only be specified if an
outer tag has also been specified";
description "Ensure that an inner tag cannot be
specified without an outer tag'";
}
description "The index into the tag stack, outermost tag
assigned index 0";
}
container tag{
leaf tag-type {
type string;
description "tag type";
}
leaf vlan-id {
type vlan-id;
description "vlan id value";
}
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description "tag";
}
description "tag list";
}
description "vlans";
}
description "interfaces list";
}
description "interface container";
}
container openflow-channel {
leaf ofls-name {
type string;
description "openflow logical name";
}
leaf dpid {
type uint32;
description "dpid value";
}
leaf of-port {
type uint32;
description "openflow channel udp port number";
}
description "configure openflow channel value";
}
list vxlan-channel{
key vxlan-tunnel-id;
leaf vxlan-tunnel-id {
type uint32;
description
"Static VxLAN tunnel ID.";
}
leaf vxlan-tunnel-name {
type string;
description
"Name of the static VxLAN tunnel.";
}
list address-family {
key "af";
leaf af {
type address-family-type;
description
"Address family type value.";
}
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leaf tunnel-source-ip {
type address-family-type;
description
"Source IP address for the static VxLAN tunnel";
}
leaf tunnel-destination-ip {
type address-family-type;
description
"Destination IP address for the static VxLAN tunnel";
}
list bind-vxlan-id {
key vxlan-id;
leaf vxlan-id {
type vxlan-id;
description
"VxLAN ID.";
}
description
"VxLAN ID list for the VTEP.";
}
description
"Per-af params.";
}
description
"Configure the VxLAN channel";
}
description "ietf-vbras configuration!";
}
description "augment lne model";
}
}
<CODE ENDS>
5. Security Considerations
6. Acknowledgements
7. IANA Considerations
This document requires no IANA Actions. Please remove this section
before RFC publication.
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8. References
8.1. Normative References
[I-D.chen-rtgwg-qos-yang]
Chen, I., "YANG Data Model for QoS", draft-chen-rtgwg-qos-
yang-04 (work in progress), October 2016.
[I-D.ietf-netmod-acl-model]
Bogdanovic, D., Koushik, K., Huang, L., and D. Blair,
"Network Access Control List (ACL) YANG Data Model",
draft-ietf-netmod-acl-model-10 (work in progress), March
2017.
[I-D.ietf-rtgwg-lne-model]
Berger, L., Hopps, C., Lindem, A., and D. Bogdanovic,
"YANG Logical Network Elements", draft-ietf-rtgwg-lne-
model-02 (work in progress), March 2017.
[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>.
[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>.
8.2. Informative References
[I-D.gu-nfvrg-cloud-bng-architecture]
Gu, R. and S. Hu, "Control and User Plane Seperation
Architecture of Cloud based BNG", draft-gu-nfvrg-cloud-
bng-architecture-00 (work in progress), February 2017.
[I-D.huang-nvo3-vxlan-extension-for-vbras]
Huang, L. and S. Hu, "VxLAN Extension Requirement for
Signaling Exchange Between Control and User Plane of
vBras", draft-huang-nvo3-vxlan-extension-for-vbras-00
(work in progress), March 2017.
[I-D.wcg-i2rs-cu-separation-infor-model]
Wang, Z., iqjie@mail.ustc.edu.cn, i., and R. Gu,
"Information Model of Control-Plane and User-Plane
separation BNG", draft-wcg-i2rs-cu-separation-infor-
model-00 (work in progress), March 2017.
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Authors' Addresses
Fangwei Hu
ZTE Corporation
No.889 Bibo Rd
Shanghai 201203
China
Phone: +86 21 68896273
Email: hu.fangwei@zte.com.cn
RongRong Hua
ZTE Corporation
No.50 Software Avenue,Yuhuatai District
Nanjing, Jiangsu Province 210012
China
Email: hua.rongrong@zte.com.cn
Shujun hu
China Mobile
32 Xuanwumen West Ave, Xicheng District
Beijing 100053
China
Email: 13488683482@139.com
Lu Huang
China Mobile
32 Xuanwumen West Ave, Xicheng District
Beijing 100053
China
Email: hlisname@yahoo.com
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