CFM CCM Extensions to Support the NSN Microwave 1+1 Hot Standby Protocol

The Nokia Siemens Networks (NSN) Microwave 1+1 Hot Standby (HSBY) protocol is a link-protection protocol that extends connectivity fault management (CFM) continuity check messages (CCMs) to enable 1:1 link redundancy in microwave devices. NSN Microwave 1+1 HSBY provides link-protection support for both indoor units (IDUs) and outdoor units (ODUs).

This document describes the extensions to the IEEE 802.1ag CFM component in Cisco IOS software that enable the detection and handling of microwave outdoor unit hardware failures.

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Restrictions for CFM CCM Extensions to Support the NSN Microwave 1+1 HSBY Protocol

  • NSN Hot Standby supports only the ES+, ES20, and 6700 series line cards on the Cisco 7600 series router.

  • To enable link-protection on a maintenance endpoint (MEP), the connectivity fault management (CFM) domain and MEP must adhere to the Nokia Siemens Networks (NSN) configuration requirements.

Information About CFM CCM Extensions to Support the NSN Microwave 1+1 HSBY Protocol

NSN Microwave 1+1 HSBY and CFM Integration

CFM Continuity Check Messages

CFM CCMs are heartbeat messages exchanged periodically between maintenance association endpoints (MEPs). CCMs allow MEPs to discover each other within a maintenance association, and allow maintenance association intermediate points (MIPs) to discover MEPs. CCMs provide a means for detecting connectivity failures in a maintenance domain. CCMs are transmitted frequently enough so that consecutive messages can be lost without causing the information to time out in any of the receiving MEPs.

For detailed information about CFM, MEPs, MIPs, and maintenance associations, see "Configuring IEEE Standard-Compliant Ethernet CFM in a Service Provider Network".

Monitoring Devices and Suspending CFM Traffic

The NSN Microwave 1+1 HSBY Protocol has specified a proprietary time-to-live (TLV) field in CCMs for monitoring active and standby ODUs, and a flag to temporarily suspend CCM monitoring. Identified by an Organizational Unique Identifier (OUI) value of 0x000FBB, the TLV is attached to CCMs as an organization-specific TLV.

An IDU or an ODU may need to temporarily halt transmitting traffic, including CCMs, in circumstances such as a software upgrade or a reload. An IDU or ODUs can set the Suspend CC Monitor flag to signal a temporary pause in CFM traffic if a suspension is needed. Using this flag prevents the other two devices from triggering an unnecessary link-protection action. The Suspend CC Monitor time interval field, in conjunction with the flag, indicates the maximum amount of time the two devices must wait before expecting CCMs to resume from the suspended device.

NSN Microwave 1+1 HSBY Protocol Monitoring of Maintenance Associations

The NSN Microwave 1+1 HSBY protocol monitors three maintenance associations. One maintenance association is at Ethernet CFM level 4 and is called the ODU-to-ODU CCM (P-CCM) session, and two maintenance associations are at Ethernet CFM level 0 and are called the IDU-to-ODU CCM (E-CCM) sessions. The IDU is associated with only the two E-CCM sessions and has an outward-facing MEP configured in each session. The IDU is required to pass CFM traffic between the ODUs only in the P-CCM session; no additional monitoring of this maintenance association is needed.

The HSBY configuration shown in the figure below supports four separate traffic flows:

  • CFM traffic between the IDU and ODU 1.

  • CFM traffic between the IDU and ODU 2.

  • CFM traffic between ODU 1 and ODU 2. This traffic passes through the IDU.

  • Data traffic between the WAN and ODU 1. This traffic passes through the IDU.

Figure 1. HSBY Protocol and CFM Maintenance Associations

Microwave 1+1 HSBY Configuration

The NSN Microwave 1+1 HSBY link-protection function within the scope of CFM CCM extensions is provided through configuration of a single IDU connected to two ODUs for redundancy. The Cisco IOS device acts as the IDU. At a given time only one ODU is actively handling data traffic, but both the active and standby ODUs are processing and transmitting CFM traffic. The CFM traffic is composed of CCMs with NSN proprietary TLV fields that extend the CCMs’ detection of connectivity failures to IDUs and ODUs. Additionally, these extended CCMs passed between the IDU and ODUs are used to indicate which ODU is active and handling the data traffic. If a failure occurs, the standby ODU assumes the role of the active ODU. The figure below shows a sample physical topology.

Figure 2. HSBY Link Protection Physical Topology

IDU Configuration Values

The HSBY Protocol specifies that some IDU parameters are configurable and others are fixed values. The table below summarizes the permitted values for an IDU using the HSBY Protocol.


Note

The same maintenance association (MA) VLAN ID (MA VLAN-ID) can be used for all MAs configured on an IDU.

Table 1 HSBY IDU Configuration Parameters

Parameter

Default Value

Permitted Values

CC Interval

100 milliseconds (ms)

10ms, 100ms, and 1000ms

Domain Level

0

Fixed

Domain Name

Null

Fixed

MA VLAN-ID (E-CCM)

None

1-15

MPID

1

Fixed

Short MA Name

None

0-65535

Suspend Interval

160 seconds

80s, 160s, 240s, and 320s

ODU Configuration Values

The HSBY Protocol specifies that some ODU parameters are configurable and others are fixed values. The table below summarizes the permitted values for an ODU using the HSBY Protocol.


Note

By default, an ODU learns the short MA name when it receives the first E-CCM from an IDU.

Table 2 HSBY ODU Configuration Parameters

Parameter

Default Value

Permitted Values

MA VLAN-ID (E-CCM)

None

16-50

MPID

2

Fixed

Short MA Name

Learned

0-65535

How to Configure CFM CCM Extensions to Support the NSN Microwave 1+1 HSBY Protocol

Configuring NSN Microwave 1+1 HSBY Protocol and CFM CCM Extensions

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    ethernet cfm global

    4.    link-protection enable

    5.    link-protection group management vlan vlan-id

    6.    link-protection group group-number pccm vlan vlan-id

    7.    ethernet cfm domain domain-name level level-id [direction outward]

    8.    id {mac-address domain-number | dns dns-name | null}

    9.    service {ma-name | ma-num | vlan-id vlan-id | vpn-id vpn-id} [port | vlan vlan-id [direction down]]

    10.    mep mpid mpid

    11.    mep mpid mpid

    12.    continuity-check [interval time | loss-threshold threshold | static rmep]

    13.    exit

    14.    exit

    15.    ethernet cfm domain domain-name level level-id [direction outward]

    16.    id {mac-address domain-number | dns dns-name | null}

    17.    service {ma-name | ma-num | vlan-id vlan-id | vpn-id vpn-id} [port | vlan vlan-id [direction down]]

    18.    mep mpid mpid

    19.    mep mpid mpid

    20.    continuity-check [interval time | loss-threshold threshold | static rmep]

    21.    exit

    22.    exit

    23.    interface type slot / port

    24.    switchport mode {access | dot1q-tunnel| dynamic {auto | desirable} | private-vlan | trunk}

    25.    spanning-tree portfast {disable | trunk}

    26.    ethernet cfm mep domain domain-name mpid mpid {port | vlan vlan-id}

    27.    link-protection group group-number

    28.    exit

    29.    interface type slot / port

    30.    switchport mode {access | dot1q-tunnel| dynamic {auto | desirable} | private-vlan | trunk}

    31.    spanning-tree portfast {disable | trunk}

    32.    ethernet cfm mep domain domain-name mpid mpid {port | vlan vlan-id}

    33.    link-protection group group-number

    34.    end

    35.    show ethernet cfm maintenance-points remote detail


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example: 
    Router> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2 configure terminal


    Example: 
    Router# configure terminal
     

    Enters global configuration mode.

     
    Step 3 ethernet cfm global


    Example: 
    Router(config)# ethernet cfm global
     

    Enables Ethernet CFM globally.

     
    Step 4 link-protection enable


    Example: 
    Router(config)# link-protection enable
     

    Enables link protection globally on the router.

     
    Step 5 link-protection group management vlan vlan-id


    Example: 
    Router(config)# link-protection group management vlan 51
     

    Defines the management VLAN used for link protection.

    • The Cisco 7600 series router supports 12 link-protection groups per router.

     
    Step 6 link-protection group group-number pccm vlan vlan-id

    Example: 
    Router(config)# link-protection group 2 pccm vlan 16
     

    Specifies an ODU-to-ODU continuity check message (P-CCM) VLAN.

     
    Step 7 ethernet cfm domain domain-name level level-id [direction outward]


    Example: 
    Router(config)# ethernet cfm domain eccm1 level 0
     

    Configures the CFM domain for ODU 1 and enters Ethernet CFM configuration mode.

     
    Step 8 id {mac-address domain-number | dns dns-name | null}


    Example: 
    Router(config-ecfm)# id null
     

    Configures a maintenance domain identifier (MDID).

     
    Step 9 service {ma-name | ma-num | vlan-id vlan-id | vpn-id vpn-id} [port | vlan vlan-id [direction down]]


    Example: 
    Router(config-ecfm)# service 1 vlan 14 direction down
     

    Defines a maintenance association for ODU 1 and enters Ethernet CFM service instance configuration mode.

     
    Step 10 mep mpid mpid


    Example: 
    Router(config-ecfm-srv)# mep mpid 1
     

    Defines the local MEP ID.

     
    Step 11 mep mpid mpid


    Example: 
    Router(config-ecfm-srv)# mep mpid 2
     

    Defines the remote MEP ID.

     
    Step 12 continuity-check [interval time | loss-threshold threshold | static rmep]


    Example: 
    Router(config-ecfm-srv)# continuity-check interval 100ms
     

    Enables transmission of continuity check messages (CCMs) within the ODU 1 maintenance association and defines a continuity-check interval.

     
    Step 13 exit


    Example: 
    Router(config-ecfm-srv)# exit
     

    Exits Ethernet CFM service instance configuration mode.

     
    Step 14 exit


    Example: 
    Router(config-ecfm)# exit
     

    Exits Ethernet CFM configuration mode.

     
    Step 15 ethernet cfm domain domain-name level level-id [direction outward]


    Example: 
    Router(config)# ethernet cfm domain eccm2 level 0
     

    Configures the CFM domain for ODU 2 and enters CFM configuration mode.

     
    Step 16 id {mac-address domain-number | dns dns-name | null}


    Example: 
    Router(config-ecfm)# id null
     

    Configures a maintenance domain identifier (MDID).

     
    Step 17 service {ma-name | ma-num | vlan-id vlan-id | vpn-id vpn-id} [port | vlan vlan-id [direction down]]


    Example: 
    Router(config-ecfm)# service 2 vlan 15 direction down
     

    Defines a maintenance association for ODU 2 and enters Ethernet CFM service configuration mode.

     
    Step 18 mep mpid mpid


    Example: 
    Router(config-ecfm-srv)# mep mpid 1
     

    Defines the local MEP ID.

     
    Step 19 mep mpid mpid


    Example: 
    Router(config-ecfm-srv)# mep mpid 2
     

    Defines the remote MEP ID.

     
    Step 20 continuity-check [interval time | loss-threshold threshold | static rmep]


    Example: 
    Router(config-ecfm-srv)# continuity-check interval 100ms
     

    Enables transmission of CCMs within the ODU 2 maintenance association and defines a continuity-check interval.

     
    Step 21 exit


    Example: 
    Router(config-ecfm-srv)# exit
     

    Exits Ethernet CFM service instance configuration mode.

     
    Step 22 exit


    Example: 
    Router(config-ecfm)# exit
     

    Exits Ethernet CFM configuration mode.

     
    Step 23 interface type slot / port


    Example: 
    Router(config)# interface gigabitethernet 1/1
     

    Configures the interface to be connected to ODU 1 and enters interface configuration mode.

     
    Step 24 switchport mode {access | dot1q-tunnel| dynamic {auto | desirable} | private-vlan | trunk}


    Example: 
    Router(config-if)# switchport mode trunk
     

    Sets the switching characteristics of the Layer 2-switched interface.

     
    Step 25 spanning-tree portfast {disable | trunk}


    Example: 
    Router(config-if)# spanning-tree portfast trunk
     

    Enables PortFast on the interface when it is in trunk mode.

     
    Step 26 ethernet cfm mep domain domain-name mpid mpid {port | vlan vlan-id}


    Example: 
    Router(config-if)# ethernet cfm mep domain eccm1 mpid 1 vlan 14
     

    Configures a CFM MEP domain for ODU 1.

     
    Step 27 link-protection group group-number

    Example: 
    Router(config-if)# link-protection group 1
     

    Configures a link-protection group for ODU 2.

     
    Step 28 exit


    Example: 
    Router(config-if)# exit
     

    Exits interface configuration mode.

     
    Step 29 interface type slot / port


    Example: 
    Router(config)# interface GigabitEthernet 3/2
     

    Configures the interface to be connected to ODU 2 and enters interface configuration mode.

     
    Step 30 switchport mode {access | dot1q-tunnel| dynamic {auto | desirable} | private-vlan | trunk}


    Example: 
    Router(config-if)# switchport mode trunk
     

    Sets the switching characteristics of the Layer 2-switched interface.

     
    Step 31 spanning-tree portfast {disable | trunk}


    Example: 
    Router(config-if)# spanning-tree portfast trunk
     

    Enables PortFast on the interface when it is in trunk mode.

     
    Step 32 ethernet cfm mep domain domain-name mpid mpid {port | vlan vlan-id}


    Example: 
    Router(config-if)# ethernet cfm mep domain eccm2 mpid 1 vlan 15
     

    Configures a CFM MEP domain for ODU 2.

     
    Step 33 link-protection group group-number

    Example: 
    Router(config-if)# link-protection group 1
     

    Configures a link-protection group for ODU 2.

     
    Step 34 end


    Example: 
    Router(config-if)# end
     

    Returns the CLI to privileged EXEC mode.

     
    Step 35 show ethernet cfm maintenance-points remote detail


    Example: 
    Router# show ethernet cfm maintenance-points remote detail
     

    (Optional) Displays remote maintenance endpoints in the continuity check database.

     

    Configuration Examples for CFM CCM Extensions to Support the NSN Microwave 1+1 HSBY Protocol

    CFM Domain and MEP Configuration

    This example is a sample CFM domain and MEP configuration that follows the NSN requirements for monitoring ODUs. The link-protection command for configuring NSN-specific parameters is included. CFM configuration parameters for an IDU are shown within angle brackets (<>): 

    link-protection suspend-interval <80s, 160s, 240s, 320s>
link-protection management vlan <51-4094>
link-protection pccm vlan <16-50>
!
ethernet cfm ieee
ethernet cfm global
!
ethernet cfm domain <Domain for ODU1> level 0
 id null
 service number <number> vlan <1-15> direction down
 continuity-check
 continuity-check interval <10, 100, 1000ms>
!
ethernet cfm domain <Domain for ODU2> level 0
 id null
 service number <number> vlan <1-15> direction down
  continuity-check
  continuity-check interval <10, 100, 1000ms>
!
interface GigabitEthernet 0/3
 ethernet cfm mep domain <Domain for ODU1> mpid 1 vlan <1-15>
   link-protection group <group #>
!
interface GigabitEthernet 0/4
 ethernet cfm mep domain <Domain for ODU2> mpid 1 vlan <1-15>
   link-protection group <group #>
!

    Example 1+1 HSBY Protocol Configuration

    The following example shows a 1+1 HSBY protocol configuration on the Cisco 7600 series router: 

    Router> enable
Router# configure terminal
Router(config)# ethernet cfm global
Router(config)# link-protection enable
Router(config)# link-protection group management vlan 51
Router(config)# link-protection group 2 pccm vlan 16
Router(config)# ethernet cfm domain eccm1 level 0
Router(config-ecfm)# id null
Router(config-ecfm)# service 1 vlan 14 direction down
Router(config-ecfm-srv)# mep mpid 1
Router(config-ecfm-srv)# mep mpid 2
Router(config-ecfm-srv)# continuity-check interval 100ms
Router(config-ecfm-srv)# exit
Router(config-ecfm)# exit
Router(config)# ethernet cfm domain eccm2 level 0
Router(config-ecfm)# id null
Router(config-ecfm)# service 2 vlan 15 direction down
Router(config-ecfm-srv)# mep mpid 1
Router(config-ecfm-srv)# mep mpid 2
Router(config-ecfm-srv)# continuity-check interval 100ms
Router(config-ecfm-srv)# exit
Router(config-ecfm)# exit
Router(config)# interface gigabitethernet 1/1
Router(config-if)# switchport mode trunk
Router(config-if)# spanning-tree portfast trunk
Router(config-if)# ethernet cfm mep domain eccm1 mpid 1 vlan 14
Router(config-if)# link-protection group 1
Router(config-if)# exit
Router(config)# interface GigabitEthernet 3/2
Router(config-if)# switchport mode trunk
Router(config-if)# spanning-tree portfast trunk
Router(config-if)# ethernet cfm mep domain eccm2 mpid 1 vlan 15
Router(config-if)# link-protection group 1
Router(config-if)# end
Router# show ethernet cfm maintenance-points remote detail

    Additional References for CFM CCM Extensions to Support the NSN Microwave 1+1 Hot Standby Protocol

    Related Documents

    Related Topic

    Document Title

    Cisco IOS commands: master list of commands with complete command syntax, command mode, command history, defaults, usage guidelines, and examples

    Cisco IOS Master Commands List, All Releases

    Carrier Ethernet commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples

    Cisco IOS Carrier Ethernet Command Reference

    Configuring IEEE Standard-Compliant Ethernet CFM

    "Configuring IEEE Standard-Compliant Ethernet CFM in a Service Provider Network"

    Configurations for Carrier Ethernet networks

    Carrier Ethernet Configuration Guide, Cisco IOS Release 15.1S

    Understanding and configuring Microwave 1+1 HSBY on the Cisco MWR 2941 Mobile Wireless Edge Router

    “Configuring Ethernet Link Operations, Administration, and Maintenance” chapter of the Cisco MWR 2941 Mobile Wireless Edge Router Software Configuration Guide, Release 15.0(1)MR

    Standards

    Standard

    Title

    IEEE 802.1ag

    Connectivity Fault Management

    MIBs

    MIB

    MIBs Link

    None

    To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

    http:/​/​www.cisco.com/​go/​mibs

    RFCs

    RFC

    Title

    None

    --

    Technical Assistance

    Description

    Link

    The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

    http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

    Feature Information for CFM CCM Extensions to Support the NSN Microwave 1+1 HSBY Protocol

    Table 3 Feature Information for CFM CCM Extensions to Support the NSN Microwave 1+1 HSBY Protocol

    Feature Name

    Releases

    Feature Information

    CFM Extension for 1+1 Hot-Standby Support

    Cisco IOS XE Release 3.9S

    The NSN Microwave 1+1 HSBY protocol is a link-protection protocol that extends CFM CCMs to enable 1:1 link redundancy in microwave devices. NSN Microwave 1+1 HSBY provides link-protection support for both IDUs and ODUs.

    In Cisco IOS XE Release 3.9S, support was added for the Cisco ASR 903 Router.

    The following command was introduced or modified: show ethernet cfm maintenance-points remote detail.