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LAB Fabric Path

LAB Fabric Path

Posted on Jan 24, 2020 (0)

LAB: FabricPath

Configure Fabric Path and test its function as per given task below.

Topology:

Refer the below topology to configure FabricPath

TASK:

Task 1:

  • Configure the fabric path on all switches with switch ID N7K1: 71, N7K2: 72, N5K1:51, N5K2:52 and enable fabric path on all inter connecting switch.
  • Configure N7K1 as root for Multidestination tree 1 and N7K2 as root for Multidestination tree 2
  • Configure link from N5K1 to Host 1 as access Port in vlan 100
  • Configure link from N5K2 to Host 2 as access Port in vlan 100
  • Host 1 has IP address of 100.100.100.11/24. Default gateway: 100.100.100.254.
  • Host 2 has IP address of 100.100.100.12/24. Default gateway: 100.100.100.254

TASK 2: 

Check Fabric Path failure scenario with Fabric Path core ports between N5K-1 and N7K-1 down

Solution:

TASK 1:

  • Configure the fabric path on all switches with switch ID N7K1: 71, N7K2: 72, N5K1:51, N5K2:52
  • Configure N7K1 as root for Multidestination tree 1 and N7K2 as root for Multidestination tree 2
  • Configure link from N5K1 to Host 1 as access Port in vlan 100
  • Configure link from N5K2 to Host 2 as access Port in vlan 100
  • Host 1 has IP address of 100.100.100.11/24. Default gateway: 100.100.100.254.
  • Host 2 has IP address of 100.100.100.12/24. Default gateway: 100.100.100.254

Enable Fabric Path feature on all switches:

N7K1(config)# install feature-set fabricpath
N7K1(config) # feature-set fabricpath
N7K2(config)# install feature-set fabricpath
N7K2(config) # feature-set fabricpath
N5K1(config) # install feature-set fabricpath
N5K1(config) # feature-set fabricpath
N5K2(config) # installs feature-set fabricpath
N5K2(config) # feature-set fabricpath

Configure VLAN 100 on all switches with Mode Fabric Path

N7K1(config)# vlan 100
N7K1(config-vlan)# mode fabricpath
N7K2(config)# vlan 100
N7K2(config-vlan)# mode fabricpath
N5K1(config)# vlan 100
N5K1(config-vlan)# mode fabricpath
N5K2(config)# vlan 100
N5K2(config-vlan)# mode fabricpath

Enable Fabric Path on all interconnecting switch interface:

N7K1(config)# int eth2/1-4
N7K1(config-if-range)# switchport
N7K1(config-if-range)# switchport mode fabricpath
N7K1(config-if-range)# no shut
N5K1(config)# int eth2/1-4
N5K1(config-if-range)# switchport
N5K1(config-if-range)# switchport mode fabricpath
N5K1(config-if-range)# no shut
N7K2(config)# int eth2/1-4
N7K2(config-if-range)# switchport
N7K2(config-if-range)# switchport mode fabricpath
N5K2(config)# int eth2/1-4
N5K2(config-if-range)# switchport
N5K2(config-if-range)# switchport mode fabricpath
N5K2(config-if-range)# no shut

Configure Switch ID as Per task :

N7K1(config)# fabricpath switch-id 71
N7K2(config)# fabricpath switch-id 72
N5K1(config)# fabricpath switch-id 51
N5K2(config)# fabricpath switch-id 52

Configure N7K1 is Root for Multidestination Tree1 and N7K2 as Root for Multidestination Tree2

N7K1(config)# fabricpath domain default
N7K1(config-fabricpath-isis)# root-priority 255
N7K2(config)# fabricpath domain default
N7K2(config-fabricpath-isis)# root-priority 254

Configure Host related Configuration:

N5K1(config)# int eth2/5
N5K1(config-if)# switchport
N5K1(config-if)# switchport mode access
N5K1(config-if)# switchport access vlan 100
N5K1(config-if)# no shut
N5K2(config)# int eth2/5
N5K2(config-if)# switchport
N5K2(config-if)# switchport mode access
N5K2(config-if)# switchport access vlan 100
N5K2(config-if)# no shut

Verification: 

Verifying FabricPath Connectivity and Configuration

A more detailed listing of the FabricPath interfaces can be printed with the following command, which will show the cost metric associated with each FabricPath link.

Default bandwidth reference for link metric is set to 400.000. It means a 10G port has a IS-IS metric of 40.

All links to adjacent FabricPath switches and IS-IS adjacency status can be shown with the following command:

Assuming that your partner has done the same, the switch ID numbering should now follow the scheme described above:

Finally, the complete route information within the FabricPath network can be shown with the following command:

To interpret the Fabric Path routing table, use the following statements:

  • From switch ID 72, to reach switch ID 51, use the outgoing local interfaces eth2/1-2

(2-ways ECMP to switch ID 51)

  • From switch ID 72, to reach switch ID 52, use the outgoing local interfaces eth2/3-4

(2-ways ECMP to switch ID 52)

  • From switch ID 72, to reach switch ID 71, use the outgoing local interfaces eth2/1-4

(4-ways ECMP to switch ID 72)

To get topological view of FabricPath multidestination tree 1 and multidestination tree 2, use the following command on all switches in the network

To check MTU value per FabricPath core port, use the following command:


TASK 3: Check Fabric Path failure scenario

  • Fabric Path core ports between N5K-1 and N7K-1 down

N7K1(config)# int eth2/1-4
N7K1(config-if-range)# shut
N7K1(config-if-range)#




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