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802.1ag Connectivity Fault Management Tutorial Part 1

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802.1ag - Connectivity Fault Management. Tutorial Part 1. Dinesh Mohan. July 12, 2004 ... and isolation of a connectivity fault to a specific bridge ... – PowerPoint PPT presentation

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Title: 802.1ag Connectivity Fault Management Tutorial Part 1


1
802.1ag - Connectivity Fault ManagementTutorial
Part 1
  • Dinesh Mohan
  • July 12, 2004

2
802.1ag PAR Overview
3
802.1ag Scope
  • This standard specifies protocols, procedures,
    and managed objects to support transport fault
    management. These allow discovery and
    verification of the path, through bridges and
    LANs, taken for frames addressed to and from
    specified network users, detection, and isolation
    of a connectivity fault to a specific bridge or
    LAN

4
802.1ag Purpose
  • Bridges are increasingly used in networks
    operated by multiple independent organizations,
    each with restricted management access to each
    others equipment. This standard will provide
    capabilities for detecting, verifying and
    isolating connectivity failures in such networks

5
802.1ag Reason for Standardization
  • Growing interest in the use of Fault Management
    tools within enterprise and provider networks
  • Such tool needed for established operational
    practices
  • Existence of similar tools e.g.
  • ATMs continuity check, Loopback and
    multiple Loopback and
  • IPs ping and traceroute
  • Interest and activities within ITU-T and MEF have
    further highlighted the need for these fault
    management tool

6
OAM Framework
7
Ethernet OAM Layering
Customer
Customer
Service Provider
Eth Access
MPLS Core
MPLS Access
Device View
CE
U-PE
U-PE
N-PE
N-PE
CE
B
B
P
P
P
P
  • Example network/service with Ethernet other
    technologies
  • The Ethernet Layer implies the visibility to
    Ethernet frames
  • BUT Flat! Difficult to manage and identify
    accountability

8
OAM Domain Service/Network
Customer
Customer
Service Provider
Eth Access
MPLS Core
MPLS Access
Customer Domain
Provider Domain
Operator Domain
Operator Domain
Operator Domain
  • Solution OAM Domains
  • Domains necessary to bound OAM Flows OAM
    responsibilities

9
Maintenance Entity Points (MEP) Maintenance
Intermediate Points (MIP)
Customer
Customer
Service Provider
Eth Access
MPLS Core
MPLS Access
Service OAM
Customer Domain
Provider Domain
Network OAM
Operator Domain
Operator Domain
Operator Domain
PW/MPLS OAM
MPLS Domain
MPLS Domain
  • MEPs initiate/terminate/react to all OAM flows
  • MIPs react to some OAM flows Optional
  • MEPs MIPs dependent on Business Models
    Deployment Scenarios

10
Ethernet MEPs MIPs
1
2
3
4
5
6
7
8
9
ETH
  • Another representation for positioning of MEPs
    and MIPs on devices with consideration for
    ingress and egress.

11
Maintenance Entities Mapped
  • Example MEs identified
  • 2 Service Providers (SP1 SP2)
  • SP2 has two domains (operators)
  • MEs 1,2,3,4 are required for Business
    relationship
  • MEs 5,6 are required for convenience

12
End-to-end OAM 2 Models
  • Provider End-to-end OAM? CE-CE (terminating UNIs)
  • 2 Possible Models
  • Strong-Trust E-NNI
  • ME (3) ME (2) ME (3)
  • Weak-Trust E-NNI
  • ME (3) ME (6) ME (4) ME (5) ME(3) or
  • ME (3) ME (6) ME (4) ME (6) ME(3)

13
Maintenance Entities P2P Case
  • MEPs realize Maintenance Entities (MEs)
  • All MEs may not be needed always

14
Maintenance Entities MP2MP Case
  • MEPs realize Maintenance Entities (MEs)
  • All MEs may not be needed always

15
Maintenance Entities CPE based Network
Demarcation Access
  • All MEs may not be needed always

16
Maintenance Entities CPE based Network
Demarcation Access
  • All MEs may not be needed always

17
Service/Network OAM How does it come together?
  • OAM Interworking possible to utilize OAM across
    Layers
  • However, each layer must support OAM capabilities
    independently

18
Connectivity Fault Management Functions
19
CFM Functionality
  • a) CC Continuity Check
  • Multicast unidirectional heartbeat
  • Use Fault Detection
  • b) Loopback
  • Unicast bi-directional request/response
  • Use Fault detection, verification
  • c) Traceroute
  • Multicast request/unicast responses
  • Use Fault Isolation

20
Other OAM Functionality (out of scope for .1ag)
  • d) Discovery
  • i) Service
  • e.g. discover all PEs supporting common service
    instance
  • ii) Network
  • e.g. discover all devices (PE and P) common to a
    domain
  • e) AIS/RDI
  • Use Elt-gtW Fault propagation, Alarm Suppression
  • f) Performance Management

21
CFM Functions mapped to MEs
Customer
Customer
Service Provider
SP 1
SP 2
SP 2
1. a, b, c
2. a, b, c
3. a, b, c, e
3. a, b, c
4. a, b, c
5. a, b, c
6. a, b, c
6. a, b, c
6. a, b, c
  • Note Specifically for ME (3) and ME (4)
  • IEEE 802.3ah OAM can be used for network/link OAM
    when UNI/E-NNI is an Ethernet link
  • When single service carried across a link,
    network OAM can map to service OAM

22
Summary
  • Ethernet moving into Provider Networks
  • Providers require fault management tools to
    manage their networks
  • High Industry interest in Ethernet connectivity
    fault management tools
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