Update uni07eta adoption config MTU to 9000

Update uni07eta adoption scenario for MTU 9000 and external
network change. All network MTUs set to 9000 to match greenfield.
External network changed from VLAN 218 to VLAN 99 to match
greenfield, with ospbr-218 handling the VLAN 218 provider network.

Related-Issue: #OSPRH-28563
Assisted-by: Claude Opus 4.6
Signed-off-by: Renjing Xiao <rxiao@redhat.com>

Author: renjingxiao

scenarios/uni07eta/config_download.yaml

@@ -44,7 +44,7 @@ parameter_defaults:
       use_neutron: false
   ExtraConfig:
     neutron::notification_driver: 'noop'
-    neutron::plugins::ml2::path_mtu: 1400
+    neutron::plugins::ml2::path_mtu: 9000
     neutron::plugins::ml2::ovn::ovn_router_indirect_snat: true
   BarbicanSimpleCryptoGlobalDefault: true
   Debug: true
@@ -53,7 +53,7 @@ parameter_defaults:
   ControllerCount: 3
   ComputeCount: 2
   NetworkerCount: 3
-  NeutronGlobalPhysnetMtu: 1400
+  NeutronGlobalPhysnetMtu: 9000
   CinderLVMLoopDeviceSize: 20480
   CloudName: overcloud.example.com
   CloudNameInternal: overcloud.internalapi.example.com
@@ -76,7 +76,7 @@ parameter_defaults:
   CtlplaneNetworkAttributes:
     network:
       dns_domain: example.com
-      mtu: 1500
+      mtu: 9000
       name: ctlplane
       tags:
         - 192.168.122.0/24

scenarios/uni07eta/network_data.yaml.j2

@@ -1,6 +1,6 @@
 ---
 - name: Storage
-  mtu: 1500
+  mtu: 9000
   vip: true
   name_lower: storage
   dns_domain: storage.{{ cloud_domain }}.
@@ -12,7 +12,7 @@
       allocation_pools: [{'start': '172.18.0.120', 'end': '172.18.0.250'}]
 
 - name: InternalApi
-  mtu: 1500
+  mtu: 9000
   vip: true
   name_lower: internal_api
   dns_domain: internal-api.{{ cloud_domain }}.
@@ -24,7 +24,7 @@
       allocation_pools: [{'start': '172.17.0.120', 'end': '172.17.0.250'}]
 
 - name: Tenant
-  mtu: 1500
+  mtu: 9000
   vip: false  # Tenant network does not use VIPs
   name_lower: tenant
   dns_domain: tenant.{{ cloud_domain }}.
@@ -36,7 +36,7 @@
       allocation_pools: [{'start': '172.19.0.120', 'end': '172.19.0.250'}]
 
 - name: Octavia
-  mtu: 1500
+  mtu: 9000
   vip: false
   name_lower: octavia
   dns_domain: octavia.{{ cloud_domain }}.
@@ -48,13 +48,13 @@
           end: 172.23.0.250
 
 - name: External
-  mtu: 1500
+  mtu: 9000
   vip: true
   name_lower: external
   dns_domain: external.{{ cloud_domain }}.
   service_net_map_replace: external
   subnets:
     external_subnet:
-      vlan: 218
-      ip_subnet: '172.38.0.0/24'
-      allocation_pools: [{'start': '172.38.0.50', 'end': '172.38.0.80'}]
+      vlan: 99
+      ip_subnet: '192.168.32.0/20'
+      allocation_pools: [{'start': '192.168.32.50', 'end': '192.168.32.80'}]