[STACK-3921] [STACK-3926] Added code for performing vcs disable on thunder

[kvishnoi-a10]

Description

Severity: High
Issue

1. The implementation of calculate delta during attachment and detachment of interface
2. Fix the issue while cascade delete of loadbalancer

Jira Ticket

• https://a10networks.atlassian.net/browse/STACK-3921
• https://a10networks.atlassian.net/browse/STACK-3926

Technical Approach

• The delta is calculated on the base of subnet of loadbalancer and member irrespective of network

Config Changes

Same as bug ticket

Test Cases

• For interface attachment

openstack loadbalancer create --name lb --vip-subnet-id public-subnet
openstack loadbalancer create --name lb1 --vip-subnet-id public-subnet2
openstack loadbalancer listener create --protocol TCP --connection-limit 600 --protocol-port 8000 --name lt1_lb1 lb1
openstack loadbalancer pool create --protocol TCP --lb-algorithm ROUND_ROBIN --listener lt1_lb1 --name pl1_lt1_lb1
openstack loadbalancer member create --address 10.0.3.28 --protocol-port 80 --subnet-id server_subnet --name mb1_pl1_lt1_lb1 pl1_lt1_lb1
openstack loadbalancer member create --address 10.0.2.28 --protocol-port 80 --subnet-id server_subnet_1 --name mb2_pl1_lt1_lb1 pl1_lt1_lb1
openstack loadbalancer member create --address 10.0.2.29 --protocol-port 80 --subnet-id server_subnet_1 --name mb3_pl1_lt1_lb1 pl1_lt1_lb1
openstack loadbalancer member create --address 10.0.3.29 --protocol-port 80 --subnet-id server_subnet --name mb4_pl1_lt1_lb1 pl1_lt1_lb1

• For delete cascade

openstack loadbalancer listener delete lt1_lb1
openstack loadbalancer listener create --protocol TCP --connection-limit 600 --protocol-port 8000 --name lt1_lb1 lb1
openstack loadbalancer listener set --default-pool pl1_lt1_lb1 lt1_lb1
openstack loadbalancer delete lb
openstack loadbalancer delete --cascade lb1

Manual Testing

• vthunder configuration after interface attachment

amphora-33abf03b-9f90-4681-b325(NOLICENSE)#sh interfaces brief
Port                Link  Dupl  Speed  Trunk Vlan Encap     MAC             IP Address          IPs Flags  Name
---------------------------------------------------------------------------------------------------------------
mgmt                Up    auto  auto   N/A   N/A  N/A       fa16.3e1e.1ff9  192.168.0.97/24       1
1                   Up    Full  10000  none  1    N/A       fa16.3e8c.431f  172.24.4.8/24         1  DataPort
2                   Up    Full  10000  none  1    N/A       fa16.3e1f.71e9  172.24.5.198/24       1  DataPort
3                   Up    Full  10000  none  1    N/A       fa16.3ec3.3395  10.0.3.153/24         1  DataPort
4                   Up    Full  10000  none  1    N/A       fa16.3ec3.f370  10.0.2.60/24          1  DataPort

Global Throughput:1056 bits/sec (132 bytes/sec)
Throughput:1056 bits/sec (132 bytes/sec)
amphora-33abf03b-9f90-4681-b325(NOLICENSE)#sh run
!Current configuration: 620 bytes
!Configuration last updated at 06:35:01 IST Fri Apr 3 2026
!Configuration last saved at 06:35:03 IST Fri Apr 3 2026
!64-bit Advanced Core OS (ACOS) version 6.0.8, build 219 (Dec-10-2025,21:21)
!
!
system password-policy complexity Default username-check enable
system password-policy complexity Default repeat-character-check enable
system password-policy complexity Default forbid-consecutive-character 4
!
system config-version
  version 0.20
  updated-at "04-03 06:35:01 IST 2026"
  modified-by admin
!
hostname amphora-33abf03b-9f90-4681-b325
!
!
interface management
  ip address dhcp
!
interface ethernet 1
  name DataPort
  enable
  ip address dhcp
!
interface ethernet 2
  name DataPort
  enable
  ip address dhcp
!
interface ethernet 3
  name DataPort
  enable
  ip address dhcp
!
interface ethernet 4
  name DataPort
  enable
  ip address dhcp
!
!
health monitor octavia_health_monitor
  retry 5
  override-ipv4 10.67.4.138
  interval 5 timeout 3
  method udp port 5556
!
slb server 6834a_10_0_2_28 10.0.2.28
  port 80 tcp
!
slb server 6834a_10_0_2_29 10.0.2.29
  port 80 tcp
!
slb server 6834a_10_0_3_28 10.0.3.28
  port 80 tcp
!
slb server 6834a_10_0_3_29 10.0.3.29
  port 80 tcp
!
slb server octavia_health_manager_controller 10.67.4.138
  health-check octavia_health_monitor
!
slb service-group 65273a86-28d8-4152-93b9-2da2e3d520ed tcp
  member 6834a_10_0_2_28 80
  member 6834a_10_0_2_29 80
  member 6834a_10_0_3_28 80
  member 6834a_10_0_3_29 80
!
slb virtual-server 3305f86a-6a01-431e-943c-c2a8aa73db19 172.24.4.190
!
slb virtual-server 36478712-7a52-41aa-a2af-1a1c7640174a 172.24.5.245
  port 8000 tcp
    name 51f94db5-3715-4cba-b960-831770128919
    conn-limit 600
    extended-stats
    service-group 65273a86-28d8-4152-93b9-2da2e3d520ed
!
!
cloud-services meta-data
  enable
  provider openstack
!
end
!Current config commit point for partition 0 is 0 & config mode is classical-mode

• vthunder config for delete cascade

amphora-33abf03b-9f90-4681-b325(NOLICENSE)#  sh interfaces brief
Port                Link  Dupl  Speed  Trunk Vlan Encap     MAC             IP Address          IPs Flags  Name
---------------------------------------------------------------------------------------------------------------
mgmt                Up    auto  auto   N/A   N/A  N/A       fa16.3e1e.1ff9  192.168.0.97/24       1
1                   Up    Full  10000  none  1    N/A       fa16.3e1f.71e9  172.24.5.198/24       1  DataPort

Global Throughput:0 bits/sec (0 bytes/sec)
Throughput:0 bits/sec (0 bytes/sec)
amphora-33abf03b-9f90-4681-b325(NOLICENSE)#sh run
!Current configuration: 619 bytes
!Configuration last updated at 06:47:42 IST Fri Apr 3 2026
!Configuration last saved at 06:47:42 IST Fri Apr 3 2026
!64-bit Advanced Core OS (ACOS) version 6.0.8, build 219 (Dec-10-2025,21:21)
!
!
system password-policy complexity Default username-check enable
system password-policy complexity Default repeat-character-check enable
system password-policy complexity Default forbid-consecutive-character 4
!
system config-version
  version 0.36
  updated-at "04-03 06:47:39 IST 2026"
  modified-by admin
!
hostname amphora-33abf03b-9f90-4681-b325
!
!
interface management
  ip address dhcp
!
interface ethernet 1
  name DataPort
  enable
  ip address dhcp
!
!
health monitor octavia_health_monitor
  retry 5
  override-ipv4 10.67.4.138
  interval 5 timeout 3
  method udp port 5556
!
slb server octavia_health_manager_controller 10.67.4.138
  health-check octavia_health_monitor
!
slb virtual-server 3029b390-5b3d-4bd4-8596-b3114fbeb940 172.24.5.68
!
!
cloud-services meta-data
  enable
  provider openstack
!
end
!Current config commit point for partition 0 is 0 & config mode is classical-mode