diff --git a/docker-sonic-vpp/conf/startup.conf.tmpl b/docker-sonic-vpp/conf/startup.conf.tmpl
index 9ba68c5..0e35460 100644
--- a/docker-sonic-vpp/conf/startup.conf.tmpl
+++ b/docker-sonic-vpp/conf/startup.conf.tmpl
@@ -301,5 +301,10 @@ plugins {
 
 # Why not support sub interfaces
 linux-cp {
-   lcp-auto-subint
+   # lcp-auto-subint disabled so sairedis owns sub-port LCP pair creation
+   # explicitly (vpp_create_router_interface, SUB_PORT path: create_subif +
+   # configure_lcp_interface). With it enabled VPP would also auto-create the
+   # pair, colliding with the explicit one.
+   # lcp-auto-subint
+   lcp-sync
 }
diff --git a/docker-syncd-vpp/conf/startup.conf.tmpl b/docker-syncd-vpp/conf/startup.conf.tmpl
index edb95f7..cf39b61 100644
--- a/docker-syncd-vpp/conf/startup.conf.tmpl
+++ b/docker-syncd-vpp/conf/startup.conf.tmpl
@@ -289,5 +289,10 @@ plugins {
 
 # Why not support sub interfaces
 linux-cp {
-   lcp-auto-subint
+   # lcp-auto-subint disabled so sairedis owns sub-port LCP pair creation
+   # explicitly (vpp_create_router_interface, SUB_PORT path: create_subif +
+   # configure_lcp_interface). With it enabled VPP would also auto-create the
+   # pair, colliding with the explicit one.
+   # lcp-auto-subint
+   lcp-sync
 }
diff --git a/docs/HLD/SONICVPP-HLD.md b/docs/HLD/SONICVPP-HLD.md
index c5eac98..45e67c2 100644
--- a/docs/HLD/SONICVPP-HLD.md
+++ b/docs/HLD/SONICVPP-HLD.md
@@ -360,7 +360,7 @@ The following table summarizes the flow from configuration to VPP/LCP API for di
 | **Front-Panel** | Loaded from `config_db.json` | `\|c\|SAI_OBJECT_TYPE_HOSTIF:oid:0xd000000000080`<br>`SAI_HOSTIF_ATTR_NAME=Ethernet0`| *vpp intf pre-created using generated `startup.conf` | `lcp_itf_pair_add_del(vpp_ifname,EthernetX)`<br><br>>`itf-pair: [0] bobm0 tap4096 Ethernet0 10 type tap` | N/A |
 | **PortChannel** | sudo config portchannel add PortChannel10<br>sudo&nbsp;config&nbsp;portchannel&nbsp;member&nbsp;add&nbsp;PortChannel10&nbsp;Ethernet4 | `\|c\|SAI_OBJECT_TYPE_LAG:oid:0x2000000000095`<br>`\|c\|SAI_OBJECT_TYPE_LAG_MEMBER:oid:0x1b000000000096`<br>`SAI_LAG_MEMBER_ATTR_LAG_ID=oid:0x2000000000095` | `bond_create`<br>`bond_add_member` | `lcp_itf_pair_add_del(BondEthernetX,beX)`<br><br>>`itf-pair: [4] BondEthernet10 tap4099 be10 16 type tap` | `beX`<br>--><br>`PortChannelX` |
 | **Loopback** | sudo config interface ip add Loopback0 10.0.0.1/32 | `\|c\|SAI_OBJECT_TYPE_ROUTE_ENTRY:{"dest":"10.0.0.1/32","` | `create_loopback_instance`<br>`sw_interface_add_del_address` | `lcp_itf_pair_add_del(loopX,tap_LoopbackX)`<br><br>>`itf-pair: [2] loop0 tap4098 tap_Loopback0 13 type tap` | `tap_LoopbackX`<br>--><br>`LoopbackX` |
-| **Subinterface** | sudo config subinterface add Ethernet0.10 10 | `\|c\|SAI_OBJECT_TYPE_ROUTER_INTERFACE:oid:0x6000000000094`<br>`SAI_ROUTER_INTERFACE_ATTR_TYPE=SAI_ROUTER_INTERFACE_TYPE_SUB_PORT` | `create_subif`| `lcp_itf_pair_add_del` automatically invoked with `lcp-auto-subinf` enabled<br><br>>`itf-pair: [3] bobm0.10 tap4096.10 Ethernet0.10 14 type tap` | N/A, shares parent tap |
+| **Subinterface** | sudo config subinterface add Ethernet0.10 10 | `\|c\|SAI_OBJECT_TYPE_ROUTER_INTERFACE:oid:0x6000000000094`<br>`SAI_ROUTER_INTERFACE_ATTR_TYPE=SAI_ROUTER_INTERFACE_TYPE_SUB_PORT` | `create_subif`| Explicit `configure_lcp_interface(bobmX.10, EthernetX.10)` from sairedis (with `lcp-auto-subint = disabled` in startup.conf)<br><br>>`itf-pair: [3] bobm0.10 tap4096.10 Ethernet0.10 14 type tap` | N/A, shares parent tap |
 
     
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