Cray System Management Documentation > Cray System Management (CSM) Administration Guide > network > management network > Management Network Switch Rename

Management Network Switch Rename

Any system moving from Shasta v1.3 to Shasta v1.4 software needs to adjust the hostnames and IP addresses for all switches to match the new standard. There is now a virtual IP address ending in .1 which is used by spine switches. In Shasta v1.3, the first spine switch used the .1 address. In Shasta v1.4, the ordering of the switches has changed with spine switches being grouped first. The hostname for switches has changed from two digits to a dash and then 3 digits. All IPv4 data for the switches and switch naming comes from Cray Site Init (CSI).

Currently, the ordering of the switches has changed with spine switches being grouped first. The hostname for switches has changed from two digits to a dash followed by three digits. All IPv4 data for the switches and switch naming comes from Cray Site Init (CSI).

From v1.3, this example system had these IP addresses and hostnames on the Hardware Management Network (HMN). Similar names and IP address numbers for the Node Management Network (NMN) and Customer Access Network (CAN) as well. Also note that some systems may not have an agg or aggregation set of switches. This is ok. Simply follow the directions in this section, always paying attention to the CSI specified IPv4 addresses, and skipping the aggregation switch directions.

10.1.0.1        sw-spine01
10.1.0.2        sw-leaf01
10.1.0.3        sw-spine02
10.1.0.4        sw-leaf02
10.1.0.5        sw-agg01
10.1.0.6        sw-agg02
10.1.0.7        sw-cdu01
10.1.0.8        sw-cdu02

The desired settings for the HMN will be similar to the following:

10.1.0.2        sw-spine-001
10.1.0.3        sw-spine-002
10.1.0.4        sw-agg-001
10.1.0.5        sw-agg-002
10.1.0.6        sw-leaf-001
10.1.0.7        sw-leaf-002
10.1.0.8        sw-cdu-001
10.1.0.9        sw-cdu-002

The system in this example needs to do the renames in the following order:

CDU switches: 8 to 9, and 7 to 8
Leaf switches: 4 to 7, and 2 to 6
Aggregation switches: 6 to 5, and 5 to 4
Spine switches: 3 to 3, and 1 to 2

These have IP address changes and name changes because there are now three digits instead of two for the switch hostname.

Check switch IP addresses, names, and component names in /var/www/ephemeral/prep/${SYSTEM_NAME}/networks when booted from the LiveCD on ncn-m001.

pit# export SYSTEM_NAME=eniac
pit# cd /var/www/ephemeral/prep/${SYSTEM_NAME}/networks

Excerpt from NMN.yaml:

pit# vi NMN.yaml
  ip_reservations:
  - ip_address: 10.252.0.2
    name: sw-spine-001
    comment: x3000c0h33s1
    aliases: []
  - ip_address: 10.252.0.3
    name: sw-spine-002
    comment: x3000c0h34s1
    aliases: []
  - ip_address: 10.252.0.4
    name: sw-cdu-001
    comment: d0w1
    aliases: []
  - ip_address: 10.252.0.5
    name: sw-cdu-002
    comment: d0w2
    aliases: []
  - ip_address: 10.252.0.6
    name: sw-leaf-001
    comment: x3000c0w38
    aliases: []
  - ip_address: 10.252.0.7
    name: sw-leaf-002
    comment: x3000c0w36
    aliases: []

Excerpt from HMN.yaml:

pit# vi HMN.yaml
  ip_reservations:
  - ip_address: 10.254.0.2
    name: sw-spine-001
    comment: x3000c0h33s1
    aliases: []
  - ip_address: 10.254.0.3
    name: sw-spine-002
    comment: x3000c0h34s1
    aliases: []
  - ip_address: 10.254.0.4
    name: sw-cdu-001
    comment: d0w1
    aliases: []
  - ip_address: 10.254.0.5
    name: sw-cdu-002
    comment: d0w2
    aliases: []
  - ip_address: 10.254.0.6
    name: sw-leaf-001
    comment: x3000c0w38
    aliases: []
  - ip_address: 10.254.0.7
    name: sw-leaf-002
    comment: x3000c0w36
    aliases: []

Excerpt from MTL.yaml:

pit# vi MTL.yaml
  ip_reservations:
  - ip_address: 10.1.0.2
    name: sw-spine-001
    comment: x3000c0h33s1
    aliases: []
  - ip_address: 10.1.0.3
    name: sw-spine-002
    comment: x3000c0h34s1
    aliases: []
  - ip_address: 10.1.0.4
    name: sw-cdu-001
    comment: d0w1
    aliases: []
  - ip_address: 10.1.0.5
    name: sw-cdu-002
    comment: d0w2
    aliases: []
  - ip_address: 10.1.0.6
    name: sw-leaf-001
    comment: x3000c0w38
    aliases: []
  - ip_address: 10.1.0.7
    name: sw-leaf-002
    comment: x3000c0w36
    aliases: []

Excerpt from CAN.yaml:

The following example includes two spine switches. Systems running a previous release would have had these as ending in .1 and in .3. Note these switches are not named “spine” or “agg” because the SHCD may specify differing exit points, but with either option the IPv4 address is specified.

pit# vi CAN.yaml
  ip_reservations:
  - ip_address: 10.103.8.2
    name: can-switch-1
    comment: ""
    aliases: []
  - ip_address: 10.103.8.3
    name: can-switch-2
    comment: ""
    aliases: []

Save the running-config from all switches before starting.

NOTE: Mellanox switches require the enable command before doing show running-config.
```
pit# ssh admin@10.1.0.1
switch# show running-config
switch# exit
```
Save this information in a text file for later evaluation and comparison after all changes have been made.
```
pit# vi before.sw-spine01.txt
```
Repeat this for all of the switches. The example system has switches up to 10.1.0.8.

Start moves with the highest numbered switch. I

In this case, that is sw-cdu02. If a switch is in a pair, start with the second half of the pair. For instance, switch 2 of 2.

Move sw-cdu02 to sw-cdu-002 and increase IP addresses as specified in CSI output. It is a Dell switch.

NOTE: Several addresses can be changed in a single session, but not the one used to connect. This first connection will skip vlan 1 and change all of the other vlans (vlan 2 and vlan 4 on a CDU switch).

pit# ssh admin@10.1.0.6
sw-cdu02# configure terminal
sw-cdu02(config)# hostname sw-cdu-002
sw-cdu-002(config)# interface vlan2
sw-cdu-002(conf-if-vl-2)# ip address 10.252.0.7/17
sw-cdu-002(conf-if-vl-2)# interface vlan4
sw-cdu-002(conf-if-vl-4)# ip address 10.254.0.7/17
sw-cdu-002(conf-if-vl-4)# router ospf 1
sw-cdu-002(config-router-ospf-1)# router-id 10.252.0.7
sw-cdu-002(config-router-ospf-1)# exit
sw-cdu-002(config)# exit
sw-cdu-002# write memory