Example for Configuring ERPS


Networking Requirements

Figure 1. ERPS Configuration Example

In order to solve the loop problem caused by redundant links in the network, ERPS protocol can be deployed on the devices that form the ring network. As shown in Figure 1, taking the deployment of a single-ring multi-instance ERPS ring as an example.

  • Switch A, Switch B, Switch C and Switch D form an ERPS ring, on which two instances are configured.
  • The RPL Owner Node of instance 1 is the interface te-1/1/19 (port1) on Switch A. The RPL is the link between Switch A and Switch D. The control VLAN is VLAN 4001 and the protection VLANs are VLAN 100-200.
  • The RPL Owner Node of instance 2 is the interface ge-1/1/5 (port0) on Switch C. Its RPL is the link between Switch B and Switch C. The control VLAN is VLAN 4002 and the protection VLANs are VLANs 300-400.

NOTEs:

  • Each ERPS port must be trunk port and disable spanning tree protocol.
  • Different ERPS ring instances cannot use the same control VLAN.
  • The same control VLAN must be configured for all devices in the same ERPS ring instance.

Procedure

Switch A

Step1         Disable spanning-tree protocol on the interface where you want to enable ERPS.

admin@SwitchA# set protocols spanning-tree interface te-1/1/3 enable false
admin@SwitchA# set protocols spanning-tree interface te-1/1/19 enable false

Step2         Configure protected MSTP instance (ERPS protected-instance) and VLAN mapping before configuring ERPS.

NOTE: The ERPS control VLAN must be in one of the protected MSTP instance.

admin@SwitchA# set protocols spanning-tree mstp msti 1 vlan 100-200
admin@SwitchA# set protocols spanning-tree mstp msti 1 vlan 4001
admin@SwitchA# set protocols spanning-tree mstp msti 2 vlan 300-400
admin@SwitchA# set protocols spanning-tree mstp msti 2 vlan 4002

Step3         Configure VLAN and port mode.

admin@SwitchA# set interface gigabit-ethernet te-1/1/3 family ethernet-switching port-mode trunk
admin@SwitchA# set interface gigabit-ethernet te-1/1/3 family ethernet-switching vlan members 100-200,300-400,4001,4002
admin@SwitchA# set interface gigabit-ethernet te-1/1/19 family ethernet-switching port-mode trunk
admin@SwitchA# set interface gigabit-ethernet te-1/1/19 family ethernet-switching vlan members 100-200,300-400,4001,4002

Step4         Create the ERPS ring with a given ID.

admin@SwitchA# set protocols erps ring 1

Step5         Configure port0 and port1 of the ERPS ring.

admin@SwitchA# set protocols erps ring 1 port0 interface te-1/1/3
admin@SwitchA# set protocols erps ring 1 port1 interface te-1/1/19

Step6         Create instance for the ERPS ring.

admin@SwitchA# set protocols erps ring 1 instance 1
admin@SwitchA# set protocols erps ring 1 instance 2

Step7         Configure port te-1/1/19 (port1) on Switch A as the RPL Owner Node for ERPS ring 1 instance 1.

admin@SwitchA# set protocols erps ring 1 instance 1 rpl port1 owner

Step8         Configure the control VLAN.

admin@SwitchA# set protocols erps ring 1 instance 1 control-vlan 4001
admin@SwitchA# set protocols erps ring 1 instance 2 control-vlan 4002

Step9         Configure the MSTP instance of VLANs that are protected by this ring instance.

admin@SwitchA# set protocols erps ring 1 instance 1 protected-instance 1
admin@SwitchA# set protocols erps ring 1 instance 2 protected-instance 2

Step10        Commit the configurations.

admin@SwitchA# commit

Switch B

Step1         Disable spanning-tree protocol on the interface where you want to enable ERPS.

admin@SwitchB# set protocols spanning-tree interface ge-1/1/3 enable false
admin@SwitchB# set protocols spanning-tree interface ge-1/1/5 enable false

Step2         Configure protected MSTP instance (ERPS protected-instance) and VLAN mapping before configuring ERPS.

NOTE: The ERPS control VLAN must be in one of the protected MSTP instance.

admin@SwitchB# set protocols spanning-tree mstp msti 1 vlan 100-200
admin@SwitchB# set protocols spanning-tree mstp msti 1 vlan 4001
admin@SwitchB# set protocols spanning-tree mstp msti 2 vlan 300-400
admin@SwitchB# set protocols spanning-tree mstp msti 2 vlan 4002

Step3         Configure VLAN and port mode.

admin@SwitchB# set interface gigabit-ethernet ge-1/1/3 family ethernet-switching port-mode trunk
admin@SwitchB# set interface gigabit-ethernet ge-1/1/3 family ethernet-switching vlan members 100-200,300-400,4001,4002
admin@SwitchB# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching port-mode trunk
admin@SwitchB# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching vlan members 100-200,300-400,4001,4002

Step4         Create the ERPS ring with a given ID.

admin@SwitchB# set protocols erps ring 1

Step5         Configure port0 and port1 of the ERPS ring.

admin@SwitchB# set protocols erps ring 1 port0 interface ge-1/1/3
admin@SwitchB# set protocols erps ring 1 port1 interface ge-1/1/5

Step6         Create instance for the ERPS ring.

admin@SwitchB# set protocols erps ring 1 instance 1
admin@SwitchB# set protocols erps ring 1 instance 2

Step7         Configure port ge-1/1/5 (port1) on Switch C as the RPL Neighbor Node for ERPS ring 1 instance 2.

admin@SwitchB# set protocols erps ring 1 instance 2 rpl port1 neighbor

Step8         Configure the control VLAN.

admin@SwitchB# set protocols erps ring 1 instance 1 control-vlan 4001
admin@SwitchB# set protocols erps ring 1 instance 2 control-vlan 4002

Step9         Configure the MSTP instance of VLANs that are protected by this ring instance.

admin@SwitchB# set protocols erps ring 1 instance 1 protected-instance 1
admin@SwitchB# set protocols erps ring 1 instance 2 protected-instance 2

Step10        Commit the configurations.

admin@SwitchB# commit

Switch C

Step1         Disable spanning-tree protocol on the interface where you want to enable ERPS.

admin@SwitchC# set protocols spanning-tree interface te-1/1/7 enable false
admin@SwitchC# set protocols spanning-tree interface ge-1/1/5 enable false

Step2         Configure MSTP instance (ERPS protected-instance) and VLAN mapping before configuring ERPS.

NOTE: The ERPS control VLAN must be in one of the protected MSTP instance.

admin@SwitchC# set protocols spanning-tree mstp msti 1 vlan 100-200
admin@SwitchC# set protocols spanning-tree mstp msti 1 vlan 4001
admin@SwitchC# set protocols spanning-tree mstp msti 2 vlan 300-400
admin@SwitchC# set protocols spanning-tree mstp msti 2 vlan 4002

Step3         Configure VLAN and port mode.

admin@SwitchC# set interface gigabit-ethernet te-1/1/7 family ethernet-switching port-mode trunk
admin@SwitchC# set interface gigabit-ethernet te-1/1/7 family ethernet-switching vlan members 100-200,300-400,4001,4002
admin@SwitchC# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching port-mode trunk
admin@SwitchC# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching vlan members 100-200,300-400,4001,4002

Step4         Create the ERPS ring with a given ID.

admin@SwitchC# set protocols erps ring 1

Step5         Configure port0 and port1 of the ERPS ring.

admin@SwitchC# set protocols erps ring 1 port0 interface ge-1/1/5
admin@SwitchC# set protocols erps ring 1 port1 interface te-1/1/7

Step6         Create instance for the ERPS ring.

admin@SwitchC# set protocols erps ring 1 instance 1
admin@SwitchC# set protocols erps ring 1 instance 2

Step7         Configure port ge-1/1/5 (port0) on Switch C as the RPL Owner Node for ERPS ring 1 instance 2.

admin@SwitchC# set protocols erps ring 1 instance 2 rpl port0 owner

Step8         Configure the control VLAN.

admin@SwitchC# set protocols erps ring 1 instance 1 control-vlan 4001
admin@SwitchC# set protocols erps ring 1 instance 2 control-vlan 4002

Step9         Configure the MSTP instance of VLANs that are protected by this ring instance.

admin@SwitchC# set protocols erps ring 1 instance 1 protected-instance 1
admin@SwitchC# set protocols erps ring 1 instance 2 protected-instance 2

Step10        Commit the configurations.

admin@SwitchC# commit

Switch D

Step1         Disable spanning-tree protocol on the interface where you want to enable ERPS.

admin@SwitchD# set protocols spanning-tree interface te-1/1/7 enable false
admin@SwitchD# set protocols spanning-tree interface te-1/1/19 enable false

Step2         Configure the protected MSTP instance (ERPS protected-instance) and VLAN mapping before configuring ERPS.

NOTE: The ERPS control VLAN must be in one of the protected MSTP instance.

admin@SwitchD# set protocols spanning-tree mstp msti 1 vlan 100-200
admin@SwitchD# set protocols spanning-tree mstp msti 1 vlan 4001
admin@SwitchD# set protocols spanning-tree mstp msti 2 vlan 300-400
admin@SwitchD# set protocols spanning-tree mstp msti 2 vlan 4002

Step3         Configure VLAN and port mode.

admin@SwitchD# set interface gigabit-ethernet te-1/1/7 family ethernet-switching port-mode trunk
admin@SwitchD# set interface gigabit-ethernet te-1/1/7 family ethernet-switching vlan members 100-200,300-400,4001,4002
admin@SwitchD# set interface gigabit-ethernet te-1/1/19 family ethernet-switching port-mode trunk
admin@SwitchD# set interface gigabit-ethernet te-1/1/19 family ethernet-switching vlan members 100-200,300-400,4001,4002

Step4         Create the ERPS ring with a given ID.

admin@SwitchD# set protocols erps ring 1

Step5         Configure port0 and port1 of the ERPS ring.

admin@SwitchD# set protocols erps ring 1 port0 interface te-1/1/7
admin@SwitchD# set protocols erps ring 1 port1 interface te-1/1/19

Step6         Create instance for the ERPS ring.

admin@SwitchD# set protocols erps ring 1 instance 1
admin@SwitchD# set protocols erps ring 1 instance 2

Step7         Configure port te-1/1/19 (port1) on Switch D as the RPL Neighbor port for ERPS ring 1 instance 1.

admin@SwitchD# set protocols erps ring 1 instance 1 rpl port1 neighbor

Step8         Configure the control VLAN.

admin@SwitchD# set protocols erps ring 1 instance 1 control-vlan 4001
admin@SwitchD# set protocols erps ring 1 instance 2 control-vlan 4002

Step9         Configure the MSTP instance of VLANs that are protected by this ring instance.

admin@SwitchD# set protocols erps ring 1 instance 1 protected-instance 1
admin@SwitchD# set protocols erps ring 1 instance 2 protected-instance 2

Step10        Commit the configurations.

admin@SwitchD# commit

Verifying the Configuration

  • The command run show erps brief can be used to check the brief configuration information of the ERPS ring. Take Switch A as an example:
admin@SwitchA# run show erps brief
Enable: true
Version: 2

D: Discarding
F: Forwarding
R: RPL Owner
N: RPL Neighbour
Ring ID    Instance ID    Control VLAN    Port0             Port1
------------------------------------------------------------------------------
1          1              4001            te-1/1/3(F)       te-1/1/19 (D,R)
1          2              4002            te-1/1/3(F)       te-1/1/19(F)
  • The command run show erps ring <ring-id> can be used to check the detailed information of the ERPS ring. Take Switch A as an example:
admin@SwitchA# run show erps ring 1
Ring ID: 1
Port0: te-1/1/3
Port1: te-1/1/19
Ring-MAC: false

Instance ID: 1
Active: true
Node state: IDLE
Description:
Control VLAN: 4001
Protected instance: 1
Protected VLAN: 100-200
Guard timer: 500
Hold-off timer: 0
WTR timer: 5
Revertive mode: Revertive
R-APS level : 7
Interface      Port Role      Port State       Signal Failure
-------------------------------------------------------------------------------
te-1/1/3       Common         Forwarding     Non-failed
te-1/19        RPL Owner      Discarding      Non-failed

Instance ID: 2
Active: true
Node state: IDLE
Description:
Control VLAN: 4002
Protected instance: 2
Protected VLAN: 300-400
Guard timer: 500
Hold-off timer: 0
WTR timer: 5
Revertive mode: Revertive
R-APS level : 7
Interface      Port Role      Port State       Signal Failure
-----------------------------------------------------------------
te-1/1/3       Common         Forwarding       Non-failed
te-1/19        Common         Forwarding       Non-failed

From the show result, we can see that port te-1/19 on Switch A is the Owner node in Instance 1, with the ERPS ring in the Idle state, the RPL owner port blocked, and the port state of the non-RPL owner port is forwarding.

In Instance 2, port0 and port1 are Normal nodes, the ERPS ring is in the Idle state, and the port state of the non-RPL owner ports are forwarding.


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