Contents

Introduction· 1

Prerequisites· 1

Example: Replacing an IRF member device with a new device· 1

Network configuration· 1

Applicable hardware and software versions· 2

Restrictions and guidelines· 3

Prerequisites· 3

Procedures· 9

Verifying the configuration· 10

 

Introduction

This document provides examples for replacing an IRF member device with a new device.

In this example, the IRF fabric does not split. Because the standby device fails, you need to replace the standby device with a new device. During replacement, the IRF fabric splits. The procedures in this example are also applicable to scenarios that the master device fails when the IRF fabric is integrated.

Prerequisites

The configuration examples in this document were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

This document assumes that you have basic knowledge of IRF.

Example: Replacing an IRF member device with a new device

Network configuration

As shown in Figure 1, Device A and Device B have set up an IRF fabric. Device A is the master device and its member ID is 1, and Device B is the standby device and its member ID is 2. BFD MAD is used for multi-active collision detection.

Device B fails when the IRF fabric is integrated. Replace Device B with a new device.

Figure 1 Network diagram

 

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

 

Hardware	Software version
S9850-G switch series	Release 6010P03 and later
S6850-G switch series S6805-G switch series	Release 6010P03 and later
S6530X switch series	Release 8108P22 and later
S5590-HI switch series	Release 6010P03 and later
S5590-EI switch series S5500V3-HI switch series	Release 6010P03 and later
S6520X-EI-G switch series S6520XP-EI-G switch series	Release 7748 and later
S5590XP-HI-G switch series	Release 7748 and later
S5560-EI-G switch series	Release 7748 and later
S5500-D-G switch series S5100-D-G switch series	Release 6010P03 and later
S5130S-HI-G switch series	Release 6010P03 and later
S5130S-EI-G switch series (except S5130S-30C-EI-G and S5130S-54C-EI-G switches)	Release 6010P03 and later
S5130S-30C-EI-G switch S5130S-54C-EI-G switch	Release 7748 and later

 

Restrictions and guidelines

Change the IRF member ID of the new device in advance and reboot the device for the change to take effect.

Prepare scripts in advance for shutting down or bringing up the uplink and downlink service interfaces on Device B. To prevent omission of service interfaces from resulting in exceptions in the replacement process, make sure the scripts contain all service interfaces on Device B.

To avoid configuration loss, do not save the running configuration on any IRF member device when the IRF fabric splits.

After the IRF fabric recovers, make sure all member devices are running correctly. Use the display interface brief command to verify that all interfaces are displayed, and then wait for 2 minutes before you move to the next step.

As a best practice to discover, locate, and analyze issues in time, record all operations during the whole replacement process. Login software, for example, HyperTerminal and PuTTY, supports session recording.  The software can automatically record all user operations and save the operations to a .txt file. If the login software does not support session recording, you must manually record all operations.

Prerequisites

1.     Configure NSR settings on the IRF fabric:

During the replacement, process-level active/standby switchover might occur for routing protocols, for example, BGP and OSPF. This issue causes routing neighbor flapping and affects packet forwarding. For high availability, configure nonstop routing (NSR) for routing protocols. Before replacing Device B, configure NSR settings and save the configuration. In this example, OSPF NSR and BGP NSR are configured for illustration.

# Enable NSR for OSPF process 100.

<IRF> system-view

[IRF] ospf 100

[IRF-ospf-100] non-stop-routing

[IRF-ospf-100] display ospf non-stop-routing status

 

         OSPF Process 100 with Router ID 0.0.0.0

                  Non Stop Routing information

 

 Non Stop Routing capability : Enabled

 Upgrade phase : Normal

[IRF-ospf-100] quit

[IRF] quit

# Enable NSR for BGP process 100.

[IRF] bgp 100

[IRF-bgp-default] non-stop-routing

[IRF-bgp-default] display bgp non-stop-routing status

 

 BGP NSR status: Ready

 Location of preferred standby process: Slot 2

 TCP NSR status: Ready

[IRF-bgp-default] quit

[IRF-bgp] quit

[IRF] quit

2.     Examine whether Device B has single-armed service links.

Single-armed service links refer to links connected only to one IRF member device in an IRF fabric. They do not connect to other IRF member devices in the IRF fabric. Traffic interruption will occur during the replacement process. To avoid traffic interruption, add backup links for the single-armed links.

3.     Check IRF status and collect information:

Before the replacement, you must check the device status, HA status, IRF status, and MAD status.

 

IMPORTANT: Make sure all member devices except Device B are in stable state. If a member device is not in stable state, identify the reason. Do not replace Device B with a new device unless other member devices are all in stable state.

 

# Display device information.

<IRF> display device

Slot Type              State    Subslot  Soft Ver             Patch Ver

1    S5590-28T8XC-HI   Master   0        S5590HI-6010P03      None

2    S5590-28T8XC-HI   Standby  0        S5590HI-6010P03      None

# Display system stable status.

<IRF> display system stable state

System state     : Stable

Redundancy state : Stable

  Slot    CPU    Role       State

  1       0      Active     Stable

  2       0      Standby    Stable

# Display brief information about system stability and status, including CPU running status, redundancy status, and NSR status.

<IRF> display system stable state summary

System state      : Stable

Redundancy state  : Stable

NSR     state     : Ready

# Display IRF information.

<IRF> display irf

MemberID    Role    Priority  CPU-Mac         Description

*+1         Master  1         f010-90db-7402  ---

  2         Standby 1         f010-90db-8100  ---

--------------------------------------------------

 * indicates the device is the master.

 + indicates the device through which the user logs in.

 

 The bridge MAC of the IRF is: ae05-0607-eaaa

 Auto upgrade                : yes

 Mac persistent              : 6 min

 Domain ID                   : 0

# Display IRF configuration on all IRF member devices.

<IRF> display irf configuration

 MemberID NewID    IRF-Port1                     IRF-Port2

 1        1        Ten-GigabitEthernet1/0/25     disable

                   Ten-GigabitEthernet1/0/26

 2        2        disable                       Ten-GigabitEthernet2/0/25

                                                 Ten-GigabitEthernet2/0/26

# Display IRF link information.

<IRF> display irf link

Member 1

 IRF Port  Interface                             Status

 1         Ten-GigabitEthernet1/0/25             UP

           Ten-GigabitEthernet1/0/26             UP

 2         disable                               --

Member 2

 IRF Port  Interface                             Status

 1         disable                               --

 2         Ten-GigabitEthernet2/0/25             UP

           Ten-GigabitEthernet2/0/26             UP

# Display IRF topology information.

<IRF> display irf topology

                              Topology Info

 -------------------------------------------------------------------------

               IRF-Port1                IRF-Port2

 MemberID    Link       neighbor      Link       neighbor    Belong To

 2           DIS        ---           UP         1           f010-90db-7402

 1           UP         2             DIS        ---         f010-90db-7402

# Display detailed MAD information.

<IRF> display mad verbose

Multi-active recovery state: No

Excluded ports (user-configured):

Excluded ports (system-configured):

  IRF physical interfaces:

    Ten-GigabitEthernet1/0/25

    Ten-GigabitEthernet1/0/26

    Ten-GigabitEthernet2/0/25

    Ten-GigabitEthernet2/0/26

  BFD MAD interfaces:

    Vlan-interface2

MAD ARP disabled.

MAD ND disabled.

MAD LACP disabled.

MAD BFD enabled interface: Vlan-interface2

  MAD status                 : Normal

  Member ID   MAD IP address       Neighbor   MAD status

  1           192.168.2.1/24       2          Normal

  2           192.168.2.2/24       1          Normal

# Display BFD session information.

<IRF> display bfd session

 Total Sessions: 1     Up Sessions: 0     Init mode: Active

 

 IPv4 session working in control packet mode:

 

 LD/RD          SourceAddr      DestAddr        State    Holdtime    Interface

 32833/0        192.168.2.1     192.168.2.2     Down        /        Vlan2

4.     Examine licensing state on the IRF fabric. If Device B has been installed with formal licenses, you must transfer the licenses on Device B to the new device before the replacement process. Alternatively, you can apply for and install new licenses of the same specification for the new device. For more information about license transfer and installation, see the licensing guide for the product. You cannot transfer trial licenses.

<IRF> display license

Slot 1:

flash:/license/210235A1XE00000000012020062314252639903.ak

Feature: OPENXCVR

Product Description: H3C Open Optical Transceiver Module Support License for 40G/10G(or Lower) Fixed-Port Campus Switches

Registered at: 2021-12-10 06:03:27

License Type: Permanent

Current State: In use

 

Slot 2:

flash:/license/210235A1XE00000000012020062314252631110.ak

Feature: OPENXCVR

Product Description: H3C Open Optical Transceiver Module Support License for 40G/10G(or Lower) Fixed-Port Campus Switches

Registered at: 2021-12-10 06:03:27

License Type: Permanent

Current State: In use

5.     Verify that the IRF fabric is running correctly, and collect status information, including status information for protocols, ports, and table entries, for comparing the information with those after replacement:

# Display system version information.

<IRF> display version

...

# Display the running configuration.

<IRF> display current-configuration

...

# Display brief interface information.

<IRF> display interface brief

...

# Display ARP entries.

<IRF> display arp

...

# Display MAC address table information.

<IRF> display mac-address

...

# Display information about OSPF neighbors.

<IRF> display ospf peer

...

# Display routing table information.

<IRF> display ip routing-table

...

# Display detailed information about aggregation groups.

<IRF> display link-aggregation verbose

...

# Display traffic rate statistics for interfaces in up state within the most recent statistics polling interval.

<IRF> display counters rate inbound interface

...

6.     Back up the next-startup configuration file:

# Save the running configuration to the main next-startup configuration file.

<IRF> save

The current configuration will be written to the device. Are you sure? [Y/N]:y

Please input the file name(*.cfg)[flash:/startup.cfg]

(To leave the existing filename unchanged, press the enter key):

Validating file. Please wait...

The startup.cfg file already exists.

Compared with the startup.cfg file, The current configuration adds 0 commands and deletes 0 commands.

If you want to see the configuration differences, please cancel this operation, and then use the display diff command to show the details.

If you continue the save operation, the file will be overwritten.

Are you sure you want to continue the save operation? [Y/N]:y

Saving the current configuration to the file. Please wait...

Saved the current configuration to mainboard device successfully.

Slot 2:

Save next configuration file successfully.

# Display the names of the current startup configuration file and the next-startup configuration files.

<IRF> display startup

MainBoard:

 Current startup saved-configuration file: NULL

 Next main startup saved-configuration file: flash:/startup.cfg

 Next backup startup saved-configuration file: NULL

Slot 2:

 Current startup saved-configuration file: NULL

 Next main startup saved-configuration file: flash:/startup.cfg

 Next backup startup saved-configuration file: NULL

# Back up next-startup configuration file startup.cfg.

<IRF> tftp 2.2.2.3 put startup.cfg

Press CTRL+C to abort.

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current

                                 Dload  Upload   Total   Spent    Left  Speed

100  8128    0     0  100  8128      0   170k --:--:-- --:--:-- --:--:--  233k

 

<IRF>

7.     Prepare the new device:

a.     Verify that the new device has the same model as the old device and runs the same version of software as the IRF fabric. If the new device runs a version of software different than the IRF fabric, upgrade the software on the new device.

<newDeviceB> display version

H3C Comware Software, Version 7.1.070, Release 6010P03

Copyright (c) 2004-2021 New H3C Technologies Co., Ltd. All rights reserved.

H3C S5590-28T8XC-HI uptime is 0 weeks, 0 days, 17 hours, 19 minutes

Last reboot reason : User reboot

...

b.     Verify that the new device has the same settings for some parameters as Device A. The parameters include the system operating mode and the maximum number of ECMP routes. The parameter requirements vary by device model. For more information about the configuration restrictions and guidelines, see IRF in Virtual Technologies Configuration Guide for the device.

c.     Change the IRF member ID of the new device to 2, the same as the old device.

[newDeviceB] irf member 1 renumber 2

Renumbering the member ID may result in configuration change or loss. Continue?[Y/N]:y

[newDeviceB] quit

d.     Save the running configuration and reboot the new device for the member ID to take effect.

<newDeviceB> save

The current configuration will be written to the device. Are you sure? [Y/N]:y

Please input the file name(*.cfg)[flash:/startup.cfg]

(To leave the existing filename unchanged, press the enter key):

Validating file. Please wait...

The startup.cfg file already exists.

Compared with the startup.cfg file, The current configuration adds 20 commands and deletes 121 commands.

If you want to see the configuration differences, please cancel this operation, and then use the display diff command to show the details.

If you continue the save operation, the file will be overwritten.

Are you sure you want to continue the save operation? [Y/N]:y

Saving the current configuration to the file. Please wait...

Saved the current configuration to mainboard device successfully.

<newDeviceB> reboot

Start to check configuration with next startup configuration file, please wait.........DONE!

This command will reboot the device. Continue? [Y/N]:y

Now rebooting, please wait.......

e.     Configure IRF port bindings. Bind Ten-GigabitEthernet 2/0/25 and Ten-GigabitEthernet 2/0/26 to IRF-port 2/2.

<newDeviceB> system-view

[newDeviceB] interface ten-gigabitethernet 2/0/25

[newDeviceB-Ten-GigabitEthernet2/0/25] shutdown

[newDeviceB-Ten-GigabitEthernet2/0/25] quit

[newDeviceB] int ten-gigabitethernet 2/0/26

[newDeviceB-Ten-GigabitEthernet2/0/26] shutdown

[newDeviceB-Ten-GigabitEthernet2/0/26] quit

[newDeviceB] irf-port 2/2

[newDeviceB-irf-port2/2] port group interface ten-gigabitethernet 2/0/25

You must perform the following tasks for a successful IRF setup:

Save the configuration after completing IRF configuration.

Execute the "irf-port-configuration active" command to activate the IRF ports.

[newDeviceB-irf-port2/2] port group interface ten-gigabitethernet 2/0/26

[newDeviceB-irf-port2/2] quit

[newDeviceB] interface ten-gigabitethernet 2/0/25

[newDeviceB-Ten-GigabitEthernet2/0/25] undo shutdown

[newDeviceB-Ten-GigabitEthernet2/0/25] quit

[newDeviceB] int ten-gigabitethernet 2/0/26

[newDeviceB-Ten-GigabitEthernet2/0/26] undo shutdown

[newDeviceB-Ten-GigabitEthernet2/0/26] quit

[newDeviceB] irf-port-configuration active

[newDeviceB] save

f.     Power off the new device.

Procedures

1.     On Device B (the old device), shut down service interfaces and save the configuration:

# On Device B, shut down all uplink and downlink service interfaces. Do not shut down IRF physical interfaces Ten-GigabitEthernet 2/0/25 and Ten-GigabitEthernet 2/0/26 and BFD MAD interface GigabitEthernet 2/0/1.

[IRF] interface range name yewu interface gigabitethernet 2/0/2 to gigabitethernet 2/0/24 ten-gigabitethernet 2/0/27 to ten-gigabitethernet 2/0/28

[IRF-if-range-yewu] shutdown

[IRF-if-range-yewu] quit

# On Device D, ping Device C. On Device C, ping Device D. If the ping operations succeed, Device C and Device D are reachable. If the ping operations fail, first resolve the communication failure issue. (Details not shown.)

2.     Verify that all services on Device B have been switched over to Device A, and then save the running configuration.

[IRF] save

The current configuration will be written to the device. Are you sure? [Y/N]:y

Please input the file name(*.cfg)[flash:/startup.cfg]

(To leave the existing filename unchanged, press the enter key):

Validating file. Please wait...

The startup.cfg file already exists.

Compared with the startup.cfg file, The current configuration adds 0 commands and deletes 0 commands.

If you want to see the configuration differences, please cancel this operation, and then use the display diff command to show the details.

If you continue the save operation, the file will be overwritten.

Are you sure you want to continue the save operation? [Y/N]:y

Saving the current configuration to the file. Please wait...

Saved the current configuration to mainboard device successfully.

Slot 2:

Save next configuration file successfully.

3.     Power off Device B, and then remove cables for IRF physical interfaces and service interfaces.

 

CAUTION: The IRF fabric splits after you power off Device B. To avoid configuration loss, do not execute the save command on Device A or Device B.

 

4.     Connect IRF physical interfaces to add the new device to the IRF fabric, and power on the new device:

# Connect IRF physical interfaces Ten-GigabitEthernet 1/0/25 and Ten-GigabitEthernet 1/0/26 and BFD MAD interface GigabitEthernet 2/0/1, and then power on the new device. The new device and Device A merge into an IRF fabric, and Device A is still the master device.

# After the new device starts up, execute the following display commands to verify that Device B and the IRF fabric are running correctly. The command outputs should be the same as those before replacement. If they are different, locate and resolve the issue.

[IRF] display system stable state

[IRF] display irf

[IRF] display irf configuration

[IRF] display irf link

[IRF] display irf topology

[IRF] display mad verbose

5.     After the new device runs stably, connect service interfaces on the new device to uplink and downlink devices and bring up all service interfaces:

# Verify that the new device is a standby device.

[IRF] display device

# Verify that all physical interfaces on the new device are displayed.

[IRF] display interface

# Wait for 2 minutes, and then connect the cables that connected to service interfaces on the old device to the service interfaces on the new device.

# Bring up all service interfaces on the new device and verify that all services are running correctly.

[IRF] interface range name yewu interface gigabitethernet 2/0/2 to gigabitethernet 2/0/24 ten-gigabitethernet 2/0/27 to ten-gigabitethernet 2/0/28

[IRF-if-range-yewu] undo shutdown

[IRF-if-range-yewu] quit

6.     Save the configuration.

[IRF] save

7.     Delete unused settings as needed and save the configuration.

[IRF] undo interface range yewu

[IRF] quit

<IRF> save

Verifying the configuration

# Check the device status, collect device status information, and compare the device status with that before replacement. If the device status information is inconsistent before and after replacement, locate and resolve the issue.

<IRF> display version

<IRF> display current-configuration

<IRF> display interface brief

<IRF> display arp

<IRF> display mac-address

<IRF> display ospf peer

<IRF> display ip routing-table

<IRF> display link-aggregation verbose

<IRF> display counters rate inbound interface

# Display device information on the IRF fabric. Verify that Device A is the master device and Device B is the standby device.

<IRF> display device

Slot Type              State    Subslot  Soft Ver             Patch Ver

1    S5590-28T8XC-HI   Master   0        S5590HI-6010P03      None

2    S5590-28T8XC-HI   Standby  0        S5590HI-6010P03      None