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Example: Deleting a Virtual Chassis Configuration for MX Series 5G Universal Routing Platforms

You can delete an MX Series Virtual Chassis configuration at any time. You might want to do so if your network configuration changes, or if you want to replace one or both MX Series member routers in the Virtual Chassis with different MX Series routers. After you delete the Virtual Chassis configuration, the routers that were formerly members of the Virtual Chassis function as two independent routers.

This example describes how to delete a Virtual Chassis configuration consisting of two MX Series routers:

Requirements

This example uses the following software and hardware components:

  • Junos OS Release 11.2 and later releases

  • One MX240 Universal Routing Platform with dual Routing Engines

  • One MX480 Universal Routing Platform with dual Routing Engines

Note:

This configuration example has been tested using the software release listed and is assumed to work on all later releases.

SeeTable 1 for information about the hardware installed in each MX Series router.

Best Practice:

We recommend that you use the commit synchronize command to save any configuration changes to the Virtual Chassis.

For an MX Series Virtual Chassis, the force option is the default and only behavior when you issue the commit synchronize command. Issuing the commit synchronize command for an MX Series Virtual Chassis configuration has the same effect as issuing the commit synchronize force command.

Overview and Topology

To delete an MX Series Virtual Chassis configuration, you must:

  1. Delete all Virtual Chassis ports.

  2. Remove the definitions and applications of the Virtual Chassis configuration groups.

  3. Delete the preprovisioned member information configured at the [edit virtual-chassis] hierarchy level.

  4. Delete any configured interfaces.

  5. Remove the member IDs of each member router.

After you issue the request virtual-chassis member-id delete command on each router to remove the member ID, the router reboots and the software disables Virtual Chassis mode on that router.

Because the entire Virtual Chassis configuration is propagated from the primary router to the other member router when the Virtual Chassis forms, you must delete each component of the Virtual Chassis configuration from both member routers, even though the component was originally configured only on the primary router. For example, even though the preprovisioned member information was configured at the [edit virtual-chassis] hierarchy level only on the primary router, you must delete the virtual-chassis stanza from the other member router in the Virtual Chassis.

Note:

When deleting the Virtual Chassis, you must also delete all Virtual Chassis-related configuration details from all stanzas, otherwise errors will result upon commit.

Note:

You cannot override a Virtual Chassis configuration simply by using the load override command to load a different configuration on the router from an ASCII file or from terminal input, as you can with other configurations. The member ID and Virtual Chassis port definitions are not stored in the configuration file, and are still defined even after the new configuration file is loaded.

Topology

This example deletes the Virtual Chassis configuration that uses the basic topology shown in Figure 1. For redundancy, each member router is configured with two Virtual Chassis ports, both of which must be removed as part of the deletion process.

Figure 1: Sample Topology for a Virtual Chassis with Two MX Series RoutersSample Topology for a Virtual Chassis with Two MX Series Routers

Table 1 shows the hardware and software configuration settings for each MX Series router in the Virtual Chassis.

Table 1: Components of the Sample MX Series Virtual Chassis

Router Name

Hardware

Serial Number

Member ID

Role

Virtual Chassis Ports

Network Port Slot Numbering

gladius

MX240 router with:

  • 60-Gigabit Ethernet Enhanced Queuing MPC

  • 20-port Gigabit Ethernet MIC with SFP

  • 4-port 10-Gigabit Ethernet MIC with XFP

  • Primary RE-S-2000 Routing Engine in slot 0 (represented in example as member0-re0)

  • Backup RE-S-2000 Routing Engine in slot 1 (represented in example as member0-re1)

JN10C7135AFC

0

routing-engine (primary)

vcp-2/2/0vcp-2/3/0

FPC 0 – 11

trefoil

MX480 router with:

  • Two 30-Gigabit Ethernet Queuing MPCs

  • Two 20-port Gigabit Ethernet MICs with SFP

  • Two 2-port 10-Gigabit Ethernet MICs with XFP

  • Primary RE-S-2000 Routing Engine in slot 0 (represented in example as member1-re0)

  • Backup RE-S-2000 Routing Engine in slot 1 (represented in example as member1-re1)

JN115D117AFB

1

routing-engine (backup)

vcp-2/0/0vcp-5/2/0

FPC 12 – 23 (offset = 12)

Configuration

To delete a Virtual Chassis configuration consisting of two MX Series routers, perform these tasks:

Deleting Virtual Chassis Ports

Step-by-Step Procedure

To delete a Virtual Chassis port from a member router, you must use the request virtual-chassis vc-port delete command.

Note:

If you issue the request virtual-chassis vc-port delete command without first installing an MX Virtual Chassis Redundancy Feature Pack license on both member routers, the software displays a warning message that you are operating without a valid Virtual Chassis software license.

To remove the Virtual Chassis ports from each member router:

  1. In the console window on member 0 (gladius), remove both Virtual Chassis ports (vcp-2/2/0 and vcp-2/3/0).

  2. In the console window on member 1 (trefoil), remove both Virtual Chassis ports (vcp-2/0/0 and vcp-5/2/0).

Results

Display the results of the Virtual Chassis port deletion on each router. Confirm that no Virtual Chassis ports are listed in the output of either the show virtual-chassis status command or the show virtual-chassis vc-port command.

Tip:

Deleting and then re-creating a Virtual Chassis port in an MX Series Virtual Chassis configuration may cause the Virtual Chassis port to appear as Absent in the Status column of the show virtual-chassis vc-port command display. To resolve this issue, reboot the FPC that hosts the re-created Virtual Chassis port.

Deleting Configuration Group Definitions and Applications

Step-by-Step Procedure

As part of deleting a Virtual Chassis configuration for MX Series routers with dual Routing Engines, you must delete the definitions and applications for the following configuration groups on both member routers:

  • member0-re0

  • member0-re1

  • member1-re0

  • member1-re1

To retain the information in these configuration groups before you delete them, you must copy them to the standard re0 and re1 configuration groups on the router, as described in the following procedure. For example, copy configuration groups member0-re0 and member1-re0 to re0, and copy member0-re1 and member1-re1 to re1.

Note:

The membern-ren naming format for configuration groups is reserved for exclusive use by member routers in MX Series Virtual Chassis configurations.

To delete the configuration group definitions and applications for an MX Series Virtual Chassis:

  1. In the console window on member 0 (gladius), delete the Virtual Chassis configuration group definitions and applications.

    1. Copy the Virtual Chassis configuration groups to the standard configuration groups re0 and re1.

    2. Apply the re0 and re1 configuration groups.

    3. Delete the Virtual Chassis configuration group definitions.

    4. Delete the Virtual Chassis configuration group applications.

  2. In the console window on member 1 (trefoil), delete the Virtual Chassis configuration group definitions and applications.

    1. Copy the Virtual Chassis configuration groups to the standard configuration groups re0 and re1.

    2. Apply the re0 and re1 configuration groups.

    3. Delete the Virtual Chassis configuration group definitions.

    4. Delete the Virtual Chassis configuration group applications.

Results

Display the results of the configuration. Confirm that configuration groups member0-re0, member 0-re1, member1-re0, and member1-re1 do not appear in the output of either the show groups command or the show apply-groups command.

Deleting Preprovisioned Member Information

Step-by-Step Procedure

You must delete the preprovisioned member information, which was configured at the [edit virtual-chassis] hierararchy level on the primary router and then propagated to the backup router during the formation of the Virtual Chassis.

To delete the preprovisioned member information for the Virtual Chassis:

  1. Delete the virtual-chassis configuration stanza on member 0 (gladius).

  2. Delete the virtual-chassis configuration stanza on member 1 (trefoil).

Results

Display the results of the deletion. Confirm that the virtual-chassis stanza no longer exists on either member router. For example, on gladius (member 0):

Deleting Configured Interfaces

Step-by-Step Procedure

As part of deleting the Virtual Chassis, we recommend that you delete any interfaces that were configured when the Virtual Chassis was formed. This action ensures that nonexistent interfaces or interfaces belonging to the other member router do not remain on the router after Virtual Chassis mode is disabled.

To delete any interfaces that you configured when creating the Virtual Chassis:

  1. In the console window on member 0 (gladius), delete any configured interfaces and commit the configuration.

    1. Delete the configured interfaces.

    2. Commit the configuration on member 0.

  2. In the console window on member 1 (trefoil), delete any configured interfaces and commit the configuration.

    1. Delete the configured interfaces.

    2. Commit the configuration on member 1.

Deleting Member IDs to Disable Virtual Chassis Mode

Step-by-Step Procedure

To delete a member ID from a Virtual Chassis member router, you must use the request virtual-chassis member-id delete command.

Note:

If you issue the request virtual-chassis member-id delete command without first installing an MX Virtual Chassis Redundancy Feature Pack license on both member routers, the software displays a warning message that you are operating without a valid Virtual Chassis software license.

To delete the Virtual Chassis member IDs and disable Virtual Chassis mode:

  1. In the console window on member 0 (gladius), delete the member ID and reboot the router.

    1. Exit configuration mode.

    2. Delete member ID 0.

  2. In the console window on member 1 (trefoil), delete the member ID and reboot the router.

    1. Exit configuration mode.

    2. Delete member ID 1.

Results

After you issue the request virtual-chassis member-id delete command to remove the member ID, the router reboots and the software disables Virtual Chassis mode on that router. The routers that were formerly members of the Virtual Chassis now function as two independent routers.

Display the results of the configuration to confirm that the Virtual Chassis configuration has been deleted on each router. For example, on gladius (formerly member 0):

Verification

To confirm that the Virtual Chassis configuration has been properly deleted, perform these tasks:

Verifying Deletion of the Virtual Chassis Ports

Purpose

Verify that the Virtual Chassis ports on both member routers have been deleted from the configuration.

Action

Display the status of the Virtual Chassis configuration and Virtual Chassis ports.

Meaning

In the output of the show virtual-chassis status command, no Virtual Chassis ports (vcp-slot/pic/port) are displayed in the Neighbor List. The asterisk (*) following Master denotes the router on which the show virtual-chassis status command command was issued.

In the output of the show virtual-chassis vc-port command, no Virtual Chassis ports are displayed on the router on which the command was issued.

Verifying Deletion of the Virtual Chassis Configuration Groups

Purpose

Verify that the definitions and applications of the following Virtual Chassis configuration groups have been deleted from the global configuration:

  • member0-re0

  • member0-re1

  • member1-re0

  • member1-re1

Action

Display the status of the Virtual Chassis configuration group definitions and applications.

Meaning

The output confirms that the Virtual Chassis configuration group definitions and applications have been deleted. In the output of both show groups and show apply-groups, only the standard configuration groups (global, re0, and re1) are listed. The Virtual Chassis configuration groups (member0-re0, member 0-re1, member1-re0, and member1-re1) do not appear.

Verifying Deletion of the Virtual Chassis Member IDs

Purpose

Verify that the member IDs for the Virtual Chassis have been deleted, and that the Virtual Chassis is no longer configured on either MX Series router.

Action

Display the results of the configuration on each router. For example, on trefoil (formerly member 1):

Meaning

When you attempt to issue either the show virtual-chassis status command or the show virtual-chassis vc-port command after the Virtual Chassis has been deleted, the router displays an error message indicating that the Virtual Chassis is no longer configured, and rejects the command.

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