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.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table.

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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. service instance trunk id ethernet
  36. encapsulation dot1q vlan-id [, vlan-id [- vlan-d]]
  37. rewrite ingress tag pop 1 symmetric
  38. bridge-domain from-encapsulation
  39. show ethernet cfm maintenance-points remote detail

DETAILED STEPS

  Command or Action Purpose
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.

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

service instance trunk id ethernet

Example:


Router(config-if)# service instance trunk 1 ethernet

Configures an Ethernet service instance on an interface and enters Ethernet service configuration mode.

Step 36

encapsulation dot1q vlan-id [, vlan-id [- vlan-d]]

Example:


Device(config-if-srv)# encapsulation dot1q 1-5, 7, 9-12

Defines the matching criteria to map 802.1Q frames ingress on an interface to the appropriate service instance.

Step 37

rewrite ingress tag pop 1 symmetric

Example:


Device(config-if-srv)# rewrite ingress tag pop 1 symmetric

Specifies the encapsulation adjustment to be performed on a frame that is entering a service instance.

Step 38

bridge-domain from-encapsulation

Example:


Device(config-if-srv)# bridge-domain from-encapsulation

Creates a list of bridge domains for an EFP trunk port using the bridge-domain IDs derived from the encapsulation VLAN numbers.

Step 39

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: 


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 .