User Guide for MICROCHIP models including: Connectivity Fault Management Configuration, Connectivity Fault Management, Configuration
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DocumentDocumentCFM Configuration Guide
Application Note
CONFIDENTIAL
AN1283
Rev. APPL-2022.09-1 2022-10-13
AN1283 - CFM Configuration Guide
Application Note
Table of Contents
1. Introduction .............................................................................................................. 3 1.1. IEEE 802.1ag ..................................................................................................... 3 1.2. Definitions ......................................................................................................... 3 1.3. CFM Protocols .................................................................................................... 3 1.4. Implementation limitations................................................................................ 4
2. Configuration ............................................................................................................ 4 2.1. Configuration of global parameters ................................................................... 5 2.2. Configuration of Domain parameters ................................................................ 6 2.3. Configuration of Service parameters ................................................................. 7 2.4. Configuration of MEP parameters ...................................................................... 9 2.5. Show Status..................................................................................................... 10
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1. Introduction
This document explains how to setup Connectivity Fault Management (CFM) features.
Connectivity Fault Management is defined by the IEEE 802.1ag standard. It defines protocols and practices for OAM (Operations, Administration, and Maintenance) for paths through 802.1 bridges and local area networks (LANs). IEEE 802.1ag is largely identical with ITU-T Recommendation Y.1731, which additionally addresses performance monitoring.
1.1. IEEE 802.1ag
Defines maintenance domains, their constituent maintenance points, and the managed objects required to create and administer them Defines the relationship between maintenance domains and the services offered by VLAN-aware bridges and provider bridges Describes the protocols and procedures used by maintenance points to maintain and diagnose connectivity faults within a maintenance domain;
1.2. Definitions
Maintenance Domain (MD) Maintenance Domains are management space on a network. MDs are configured with Names and Levels, where the eight levels range from 0 to 7. A hierarchical relationship exists between domains based on levels. The larger the domain, the higher the level value. Recommended values of levels are as follows: Customer Domain: Largest (e.g., 7) Provider Domain: In between (e.g., 3) Operator Domain: Smallest (e.g., 1)
Maintenance Association (MA) Defined as a "set of MEPs, all of which are configured with the same MAID (Maintenance Association Identifier) and MD Level, each of which is configured with a MEPID unique within that MAID and MD Level, and all of which are configured with the complete list of MEPIDs."
Maintenance association End Point (MEP) Points at the edge of the domain, define the boundary for the domain. A MEP sends and receives CFM frames through the relay function, drops all CFM frames of its level or lower that come from the wire side.
Maintenance domain Intermediate Point (MIP) Points internal to a domain, not at the boundary. CFM frames received from MEPs and other MIPs are cataloged and forwarded, all CFM frames at a lower level are stopped and dropped. MIPs are passive points, respond only when triggered by CFM trace route and loop-back messages.
1.3. CFM Protocols
IEEE 802.1ag Ethernet CFM (Connectivity Fault Management) protocols comprise three protocols. They are:
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Continuity Check Protocol (CCP) The Continuity Check Message (CCM) provides a means to detect connectivity failures in an MA. CCMs are multicast messages. CCMs are confined to a domain (MD). These messages are unidirectional and do not solicit a response. Each MEP transmits a periodic multicast Continuity Check Message inward towards the other MEPs.
Link Trace (LT) Link Trace messages otherwise known as Mac Trace Route are Multicast frames that a MEP transmits to track the path (hop-by-hop) to a destination MEP which is similar in concept to User Datagram Protocol (UDP) Trace Route. Each receiving MEP sends a Trace Route Reply directly to the Originating MEP, and regenerates the Trace Route Message.
Loop-back (LB) Loop-back messages otherwise known as MAC ping are Unicast frames that a MEP transmits, they are similar in concept to an Internet Control Message Protocol (ICMP) Echo (Ping) messages, sending Loopback to successive MIPs can determine the location of a fault. Sending a high volume of Loopback Messages can test bandwidth, reliability, or jitter of a service, which is similar to flood ping. A MEP can send a Loopback to any MEP or MIP in the service. Unlike CCMs, Loop back messages are administratively initiated and stopped.
1.4. Implementation limitations
The current implementation does not support Maintenance domain Intermediate Point (MIP), Up-MEP, Link Trace (LT), and Loop-back (LB).
2. Configuration
An example of a full stack CFM configuration is shown below:
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# show running-config feature cfm all-defaults Building configuration... cfm sender-id-tlv disable cfm port-status-tlv disable cfm interface-status-tlv disable cfm organization-specific-tlv disable ! cfm domain MyDomain
format none level 3 sender-id-tlv chassis-management port-status-tlv enable interface-status-tlv enable organization-specific-tlv defer service MyService
format icc "ICC000MEG0000" type port continuity-check interval 100ms sender-id-tlv disable port-status-tlv defer interface-status-tlv defer organization-specific-tlv defer mep 301
direction down interface GigabitEthernet 1/2 vlan 100 pcp 6 no smac remote mep 300 continuity-check alarm-level 1 alarm-time-present 2500 alarm-time-absent 10000 admin-state disable ! end
2.1. Configuration of global parameters
The syntax for cfm global level cli command is:
cfm interface-status-tlv { disable | enable } cfm organization-specific-tlv { disable | enable oui <oui> subtype <subtype> value <value> } cfm port-status-tlv { disable | enable } cfm sender-id-tlv { disable | chassis | management | chassis-management }
Where:
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interface-status-tlv be overridden
organization-specific-tlv be
oui subtype value port-status-tlv overridden in
sender-id-tlv overridden in
chassis chassis-management Address) and Management
disable management Address).
Include or exclude Interface Status TLV in CCM PDUs (may
in domain and service). Include or exclude Organization-Specific TLV in PDUs (may
overridden in domain and service). The OUI on form XX-XX-XX. Subtype value (0-255). A double quoted string with length 1-63 . Include or exclude Port Status TLV in CCM PDUs (may be
domain and service). Default Sender ID TLV format to be used in PDUs (may be
domain and service). Enable Sender ID TLV and send Chassis ID (MAC Address). Enable Sender ID TLV and send both Chassis ID (MAC
Address (IPv4 Address). Exclude TLV from PDUs (default). Enable Sender ID TLV and send Management address (IPv4
An example is shown below:
(config)# cfm sender-id-tlv chassis-management (config)# cfm port-status-tlv enable (config)# cfm interface-status-tlv enable (config)# cfm organization-specific-tlv enable oui 01-02-03 subtype 1 value "Example of oui value string."
2.2. Configuration of Domain parameters
The syntax for cfm domain CLI command is:
cfm domain <md_name> no cfm domain { <md_name> | all } format { none | string <name> } interface-status-tlv { disable | enable | defer } level <level> organization-specific-tlv { disable | defer } port-status-tlv { disable | enable | defer } sender-id-tlv { disable | chassis | management | chassis-management | defer }
Where:
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format interface-status-tlv in this
in service) level organization-specific-tlv included in this
service) port-status-tlv this domain or
sender-id-tlv domain (may be
Change format of this domain Include or exclude Interface Status TLV in PDUs included
domain or let higher level determine (may be overridden
Change level (MEG-level) of this domain Include or exclude Organization-Specific TLV in PDUs
MD or let higher level determine (may be overridden in
Include or exclude Port Status TLV in PDUs included in
let higher level determine (may be overridden in service) Default Sender ID TLV format to be used in PDUs in this
overridden in service)
Example:
(config)# cfm domain MyDomain (config-cfm-dmn)# format none (config-cfm-dmn)# level 3 (config-cfm-dmn)# sender-id-tlv chassis-management (config-cfm-dmn)# port-status-tlv enable (config-cfm-dmn)# interface-status-tlv enable (config-cfm-dmn)# organization-specific-tlv defer
2.3. Configuration of Service parameters
The syntax for cfm service level cli command is:
service <ma_name> continuity-check interval { 3.3ms | 10ms | 100ms | 1s | 10s | 1min | 10min } format { string <format_string> | integer <format_integer> | icc <format_icc_string> | icc-cc <format_icc_cc_string> } interface-status-tlv { disable | enable | defer } mep <mepid> no mep { <mepid> | all } organization-specific-tlv { disable | defer } port-status-tlv { disable | enable | defer } sender-id-tlv { disable | chassis | management | chassis-management | defer } type { port | vlan <vid> }
Where:
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continuity-check
Specify the CCM interval for all MEPs in this service (MA).
Default is 1s.
format
Change the format used in MAID/MEGID for this service (MA).
string
Character string (type 2). A double quoted string with 1
to 45
characters.
integer
2-octet integer (type 3), <0-65535>.
icc
ITU-T ICC-based format (type 32). Must be exactly 13
characters long
double quoted string.
icc-cc
ITU-T ICC-CC-based format (type 33). Must be exactly 15
characters long
double quoted string, and the first two characters must be
from [A-Z].
interface-status-tlv
Include or exclude Interface Status TLV in PDUs included
in MEPs
running in this service or let domain determine.
mep
Create or modify a Maintenance association EndPoint (MEP).
no
Negate a command or set its defaults.
organization-specific-tlv Include or exclude Organization-Specific TLV in PDUs on
MEPs running in
this service or let the domain determine.
port-status-tlv
Include or exclude Port Status TLV in PDUs for MEPs
included in this
service or let domain determine.
sender-id-tlv
Default Sender ID TLV format to be used in PDUs in MEPs
running in
this service.
service
Create or modify a Service (MA).
type
Specify whether MEPs created in this service are port or
VLAN MEPs.
port
All MEPs created within this MA will be created as port
MEPs
(interface MEPs). There can only be one port MEP per
interface.
A given port MEP may still be created with tags, if that
MEP's VLAN is non-zero.
vlan
All MEPs created within this MA will created as VLAN MEPs.
A given MEP may be configured with another VLAN than the
MA's
primary VID, but it is impossible to have untagged VLAN
MEPs.
Example:
(config-cfm-dmn)# service MyService (config-cfm-dmn-svc)# format icc "ICC000MEG0000" (config-cfm-dmn-svc)# continuity-check interval 100ms (config-cfm-dmn-svc)# sender-id-tlv disable (config-cfm-dmn-svc)# port-status-tlv defer (config-cfm-dmn-svc)# interface-status-tlv defer (config-cfm-dmn-svc)# organization-specific-tlv defer (config-cfm-dmn-svc)# type vlan 6
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2.4. Configuration of MEP parameters
The syntax for cfm mep level cli command is as follows
mep <1-8191> admin-state { enable | disable } alarm-level <alarm_level> alarm-time-absent <alarm_time_absent_ms> alarm-time-present <alarm_time_present_ms> continuity-check direction { up | down } interface <port_type> <port> mep <mepid> no continuity-check no remote mep { <rmepid> | all } no smac pcp <pcp> remote mep <rmepid> smac <mac> vlan { untagged | <vid> }
Where:
mep
Create or modify a MEP
admin-state
Enable or disable this MEP.
alarm-level
If a defect is detected with a priority higher than this level, a
fault alarm
notification will be generated.
alarm-time-absent The time in milliseconds that defects must be absent before a
fault alarm
notification is reset. Default is 10000 ms.
alarm-time-present The time in milliseconds that defects must be present before a
fault alarm
notification is issued. Default is 2500 ms.
continuity-check Enable or disable (no-form) generation of conitinuity-check
messages (CCMs)
direction
Set whether this MEP is an Up- or a Down-MEP.
interface
Select an interface to configure.
mep
Create or modify a Maintenance association EndPoint (MEP).
no
Negate a command or set its defaults.
pcp
Choose PCP value in PDUs' VLAN tag. Not used if untagged.
remote
Specify the Remote MEPs that this MEP is expected to receive CCM
PDUs from.
smac
Set a Source MAC address to be used in PDUs for this MEP. Default
to use
interface's.
vlan
VLAN commands.
Example:
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(config-cfm-dmn-svc)# mep 301 (config-cfm-dmn-svc-mep)# direction down (config-cfm-dmn-svc-mep)# interface GigabitEthernet 1/2 (config-cfm-dmn-svc-mep)# vlan 100 (config-cfm-dmn-svc-mep)# pcp 6 (config-cfm-dmn-svc-mep)# no smac (config-cfm-dmn-svc-mep)# remote mep 300 (config-cfm-dmn-svc-mep)# continuity-check (config-cfm-dmn-svc-mep)# alarm-level 1 (config-cfm-dmn-svc-mep)# alarm-time-present 2500 (config-cfm-dmn-svc-mep)# alarm-time-absent 10000 (config-cfm-dmn-svc-mep)# admin-state disable
2.5. Show Status
The format of the 'show cfm' CLI command is as shown below:
show cfm domains [domain <md_name>] [details] show cfm services [domain <md_name>] [service <ma_name>] [details] show cfm errors show cfm meps [domain <md_name>] [service <ma_name>] [mep-id <mepid>] [details]
Where:
domains services errors meps details domain mep-id service
Show CFM Domains. Show CFM Services Show CFM configuration and run-time errors. Show MEPs. Show detailed information. Select domain to show info for. Select a MEP to show info for. Select a service to show info for.
Example:
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# show cfm mep det Defect abbreviations (alarm level in parentheses): R (1): someRDIdefect (RDI received from at least one remote MEP) M (2): someMACstatusDefect (received Port Status TLV != psUp or Interface Status TLV != isUp) C (3): someRMEPCCMdefect (valid CCM is not received within 3.5 times CCM interval from at least one remote MEP) E (4): errorCCMdefect (received CCM from an unknown remote MEP-ID or CCM interval mismatch) X (5): xconCCMdefect (received CCM with an MD/MEG level smaller than configured or wrong MAID/MEGID (cross-connect))
Domain:
MyDomain
Service:
MyService
MEP-ID:
200
MAC Address:
00-01-c1-00-6a-42
Direction:
Down
Interface:
Gi 1/2
Continuity-check:
Enabled
presentRDI:
Yes
Type:
Untagged Port MEP
MEP Active:
Yes
enableRMEPdefect:
False (No link on residence interface)
FNG State:
FNG_DEFECT_REPORTED (highest defect: errorCCMdefect)
Defects:
--CE-
Rx CCM PDU Count:
0
Tx CCM PDU Count:
14918
Rx Invalid CCM PDU Count: 21062
Rx CCM PDU Seq. Errors: 0
Remote MEP-ID:
201
State:
RMEP_FAILED
MAC Address:
00-00-00-00-00-00
Failed/OK Time:
4 minutes and 0 seconds after boot (4 hours, 5 minutes and
2 seconds ago)
RDI:
0
Port Status:
Not received (0)
Interface Status:
Not received (0)
Sender ID:
Not received
Org-Specific TLV:
Not received
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