Configuring Maintenance Intermediate Points

This article describes the configuration of the MIP (Maintenance Intermediate Point) on an interface.
MIP can be configured on an interface using either of the following two methods:

1. Explicit MIP Creation

2. Implicit MIP Creation

The following table lists the various MIP creation criteria and their description.

MIP Creation Criteria

CLI Configurations

Explicit MIP Creation

Explicit MIP can be configured in two ways:

• MIP associated with an MA
• MIP associated with Default Domain

MIP associated with an MA
Prerequisites:

1. MA must be configured at same MD level and VLAN at which MIP is to be configured.

2. At least a single Up direction MEP must be configured and associated with MA. Refer to IEEE Standard P802.1ag/D8 Section 22.2.3 (k).

3. The MIP creation criteria parameter should be configured for MA. Refer IEEE Standard P802.1ag/D8 Section 22.2.3 (1,2,3,4).

Configuration steps:

1. Set the default MD level corresponding to the VLAN in Default MD table.
   your product(config)# ethernet cfm default-domain vlan 101 level 7

2. Execute the steps given in CLI Configurations to configure an Up direction MEP for the level 7 and VLAN 101.

3. Set the MIP creation criteria. Refer to the table above for the conditions for each MIP creation criteria. If the mip-creation-criteria value of MA is defer, control of MIP creation criteria is deferred from MA to MD.

• Set the MIP creation criteria parameter to default for an MA
  your product(config)#ethernet cfm domain name TestDomain1 level 7
  your product(config-ether-ecfm)#service name CustAssoc1 vlan 101 mip-creation-criteria default
  OR

• Set the MIP creation criteria to defer for an MA and to default for an MD.
  your product(config)# ethernet cfm domain name TestDomain1 level 7
  your product(config-ether-ecfm)# set mip-creation-criteria default
  your product(config-ether-ecfm)# service name CustAssoc1 vlan 101 mip-creation-criteria defer

4. Entert the interface configuration mode and configure an MIP at specified maintenance level and VLAN on an interface.
   your product(config)# interface gigabitethernet 0/2
   your product(config-if)# ethernet cfm mip level 7 vlan 101

MIP associated with Default Domain
Prerequisites:

1. No MA must be configured at the same MD level and VLAN along with an Up direction MEP.

2. Entry in the Default MD table should be present for the same MD level and VLAN or Default MD default level should be configured. Refer to IEEE Standard P802.1ag/D8 Section 12.14.3.1.3 (b).

3. MIP creation criteria parameter should be configured for Default Domain. Refer to IEEE Standard P802.1ag/D8 Section 22.2.3 (m).

Configuration steps:

• Set the parameters such as MD level and MIP creation criteria required for MIP creation for a VLAN
  your product(config)# ethernet cfm default-domain vlan 101 level 7
  your product(config)# interface gigabitethernet 0/1
  your product(config-if)# ethernet cfm mip level 7 vlan 101 active
  OR

• Set the parameters such as MD level and MIP creation criteria required for MIP creation at any VLAN.
  your product(config)#ethernet cfm default-domain global level 7 mip-creation-criteria default
  your product(config)# interface gigabitethernet 0/1
  your product(config-if)# ethernet cfm mip level 7 vlan 101 active

Implicit MIP Creation

Implicit MIP can be configured when:

• The bridge is initialized.
• MEP is created or deleted on VLAN x on a bridge port.
• A change occurs in the default MD-managed object.
• A change occurs in MA associated with VLAN(s).

Managed objects that affect the MIP creation are MA, Default MD, Default Default MD, and MEP.

MIP creation evaluation process

At a particular port, single MIP can be configured for a VLAN at the highest MD level only.

For a particular port p and VLAN x, MIP creation is evaluated as follows:

1. Determine eligible MD levels for VLAN x based on:

• The MD level of each of the MA that includes VLAN x.
• The Default MD level corresponding to VLAN x.

2. Determine, from the eligible MD levels, a lowest MD level d which satisfies the following condition:

• There is no MP configured on the bridge port p and VLAN x at MD level d or MD level greater than d.

3. Check the MIP creation criteria to determine whether an MIP is to be created or not.

MIP creation criteria are taken from:

• MA, if there exists an MA that includes VLAN x and has at least one Up MEP configured on some bridge port.
• MD, if there exists an MA that includes VLAN x, has at least one Up MEP configured on some bridge port and has MIP creation criteria set as defer.
• Default MD Level, if an MA that includes VLAN x does not exist.
• Default Default MD Level, if an MA that includes VLAN x and the corresponding Default MD having its MIP creation criteria as defer does not exist.

To create MIP(s) based on trigger 3 (A change that occurs in the Default MD)

1. Enable the implicit MIP evaluation and creation.
   your product(config)# ethernet cfm mip dynamic evaluation

2. Set interfaces 1 and 2 as up.
   your product(config)# interface gigabitethernet 0/1
   your product(config)#no shutdown
   your product(config)#exit
   your product(config)# interface gigabitethernet 0/2
   your product(config)#no shutdown
   your product(config)#exit

3. Create VLANs and make interfaces 1 and 2 as member ports of this VLANs.
   your product(config)#vlan 1
   your product(config-vlan)# ports gigabitethernet 0/1-2
   your product(config)#exit
   your product(config)#vlan 2
   your product(config-vlan)# ports gigabitethernet 0/1-2
   your product(config)#exit

4. Change the global Default MD level as 7 and MIP creation criteria as default.
   your product(config)#ethernet cfm default-domain global level 7 mip-creation-criteria default

To verify whether four MIPs are created

1. Display details of all the configured MIPs.

your product# show ethernet cfm maintenance-point local
--------------- -------------------------------------
MPID DomainName Level VLAN Type Port CC-Status
ServiceName ISID Dir MAC MP-Status
------------------- -----------------------------------
- - 7 1 MIP Gi0/1 -
- - - - 00:01:02:03:04:01 Active
-- 7 2 MIP Gi0/1 -
-- - - 00:01:02:03:04:01 Active
- - 7 1 MIP Gi0/2 -
-- - - 00:01:02:03:04:02 Active- - 7 2 MIP Gi0/2 -
- - - 00:01:02:03:04:02 Active

SNMP Configurations

Explicit MIP Creation

Explicit MIP can be configured in the following two ways:

• MIP associated with an MA
• MIP associated with Default Domain

MIP associated with an MA

1. Set the MD level corresponding to the VLAN in Default MD table at which MIP is to be created. [Index: ContextID = 0, VlanID = 101]
   % snmp 0 set {{fsMIEcfmDefaultMdLevel.0.101 7 }}

2. Execute the steps given in SNMP Configurations to configure an Up direction MEP for the MD level 7and VLAN 101.

3. Configure the MIP creation criteria parameter.

• Set the MIP creation criteria parameter to default for MA. [Index: ContextID = 0, MD-Index = 1, MA-Index = 1]
  % snmp0 set {{fsMIEcfmMaRowStatus.0.1.1 notInService }}
  % snmp 0 set {{fsMIEcfmMaMhfCreation.0.1.1 defMHFdefault }}
  % snmp0 set {{fsMIEcfmMaRowStatus.0.1.1 active }}

OR

• Set the MIP creation criteria parameter to defer for MA and default for MD.
  [Index: ContextID = 0, MD-Index = 1]
  % snmp0 set {{fsMIEcfmMdRowStatus.0.1 notInService }}
  % snmp0 set {{fsMIEcfmMdMhfCreation.0.1 defMHFdefault }}
  % snmp0 set {{fsMIEcfmMdRowStatus.0.1 active }}
  [Index: ContextID = 0, MD-Index = 1, MA-Index = 1]
  % snmp0 set {{fsMIEcfmMaRowStatus.0.1.1 notInService }}
  % snmp0 set {{fsMIEcfmMaMhfCreation.0.1.1 defMHFdefer }}
  % snmp0 set {{fsMIEcfmMaRowStatus.0.1.1 active }}

4. Configure MIP at VLAN 101 and MD level 7. [Index: Interface Number = 2, MD-level = 7, VlanID = 101]
   % snmp0 set {{fsMIEcfmMipRowStatus.2.7.101 createAndGo }}
   % snmp0 set {{fsMIEcfmMipRowStatus.2.7.101 active }}

MIP associated with Default Domain

1. Set the parameters such as MD level and MIP creation criteria, required for the MIP creation for a VLAN.

2. Configure Default MD table [Index: ContextID = 0, VlanID = 101]
   % snmp0 set {{fsMIEcfmDefaultMdLevel.0.101 7 }}
   % snmp0 set {{fsMIEcfmDefaultMdMhfCreation.0.101 defMHFdefault }}

3. Configure MIP at MD Level 7, VLAN 101 and interface 1.
   [Index: Interface Number = 1, MD-level = 7, VlanID = 101]
   % snmp0 set {{fsMIEcfmMipRowStatus.1.7.101 createAndGo }}
   % snmp0 set {{fsMIEcfmMipRowStatus.1.7.101 active }}

OR

Set the parameters such as MD level and MIP creation criteria, required for MIP creation at any VLAN.

4. Configure default MD scalar [Index: ContextID = 0]
   % snmp0 set {{fsMIEcfmDefaultMdDefMhfCreation.0 defMHF:1 default }}
   % snmp0 set {{fsMIEcfmDefaultMdDefLevel.0 7 }}

5. Configure MIP at MD Level 7, VLAN 101 and interface 1. [Index: Interface Number = 1, MD-level = 7, VlanID = 101]
   % snmp0 set {{fsMIEcfmMipRowStatus.1.7.101 createAndGo }}
   % snmp0 set {{fsMIEcfmMipRowStatus.1.7.101 active }}

Implicit MIP Creation

To create MIP(s) based on trigger 3 (A change that occurs in the Default MD):

1. Enable the implicit MIP evaluation and creation. [Index: ContextID = 0]
   % snmp0 set {{fsMIEcfmMipDynamicEvaluationStatus.0 true}}

2. Set interfaces 1 and 2 as up.
   [Index: Interface Number = 1]
   % snmp0 set {{ifMainAdminStatus.1 up }}
   % snmp0 set {{fsVcId.1 0 }}
   % snmp0 set {{fsVcIfRowStatus.1 active }}
   [Index: Interface Number = 2]
   % snmp0 set {{ifMainAdminStatus.2 up }}
   % snmp0 set {{fsVcId.2 0 }}
   % snmp0 set {{fsVcIfRowStatus.2 active }}

3. Create VLAN 101 and make interfaces 1 and 2 as member ports of this VLAN.
   [Index: ContextID = 0, VlanId=101]
   % snmp0 set {{fsDot1qVlanStaticRowStatus.0.101 createAndWait }}
   [Index: ContextID = 0, VlanId=101, Interface Number = 1]
   % snmp0 set {{fsDot1qVlanStaticPort.0.101.1 addTagged }}
   [Index: ContextID = 0, VlanId=101, Interface Number = 2]
   % snmp0 set {{fsDot1qVlanStaticPort.0.101.2 addTagged }}
   [Index: ContextID = 0, VlanId=101]
   % snmp0 set {{fsDot1qVlanStaticRowStatus.0.101 active }}

4. Change the default MD default level as 7 and MIP creation criteria as default. [Index: ContextID = 0]
   % snmp0 set {{fsMIEcfmDefaultMdDefMhfCreation.0 defMHFdefault }}
   % snmp0 **set {{fsMIEcfmDefaultMdDefLevel.**0 7 }}

To verify whether four MIPs are created

1. Walk the table fsMIEcfmMipTable.

% snmp0 walk x fsMIEcfmMipTable {puts $x}
{1.3.6.1.4.1.2076.160.1.1.6.1.4.3.7.1 INTEGER true}
{1.3.6.1.4.1.2076.160.1.1.6.1.4.3.7.2 INTEGER true}
{1.3.6.1.4.1.2076.160.1.1.6.1.4.4.7.1 INTEGER true}
{1.3.6.1.4.1.2076.160.1.1.6.1.4.4.7.2 INTEGER true}
{1.3.6.1.4.1.2076.160.1.1.6.1.5.3.7.1 INTEGER active}
{1.3.6.1.4.1.2076.160.1.1.6.1.5.3.7.2 INTEGER active}
{1.3.6.1.4.1.2076.160.1.1.6.1.5.4.7.1 INTEGER active}
{1.3.6.1.4.1.2076.160.1.1.6.1.5.4.7.2 INTEGER active}