diff --git a/api/v1alpha1/router_types.go b/api/v1alpha1/router_types.go
index 3a58562..8c22761 100644
--- a/api/v1alpha1/router_types.go
+++ b/api/v1alpha1/router_types.go
@@ -64,11 +64,12 @@ type BGPRouterSpec struct {
 	// +optional
 	SRv6Locator string `json:"srv6Locator,omitempty"`
 
-	// NodeID is this router's 8-bit slot within its PoP's SRv6Locator block,
+	// NodeID is this router's 16-bit slot within its PoP's SRv6Locator block,
 	// used for RFC 9800 NEXT-CSID compression. Unique within the PoP.
-	// Values 0 and 255 are reserved.
+	// The uSID carrier format reserves 0x0000 and 0xE000-0xFFFF (the latter is
+	// Function space, not Node-ID space), leaving 0x0001-0xDFFF assignable.
 	// +kubebuilder:validation:Minimum=1
-	// +kubebuilder:validation:Maximum=254
+	// +kubebuilder:validation:Maximum=57343
 	// +optional
 	NodeID int32 `json:"nodeID,omitempty"`
 
diff --git a/config/crd/network.datumapis.com_bgprouters.yaml b/config/crd/network.datumapis.com_bgprouters.yaml
index dcad7bd..853c2ca 100644
--- a/config/crd/network.datumapis.com_bgprouters.yaml
+++ b/config/crd/network.datumapis.com_bgprouters.yaml
@@ -112,11 +112,12 @@ spec:
                 type: integer
               nodeID:
                 description: |-
-                  NodeID is this router's 8-bit slot within its PoP's SRv6Locator block,
+                  NodeID is this router's 16-bit slot within its PoP's SRv6Locator block,
                   used for RFC 9800 NEXT-CSID compression. Unique within the PoP.
-                  Values 0 and 255 are reserved.
+                  The uSID carrier format reserves 0x0000 and 0xE000-0xFFFF (the latter is
+                  Function space, not Node-ID space), leaving 0x0001-0xDFFF assignable.
                 format: int32
-                maximum: 254
+                maximum: 57343
                 minimum: 1
                 type: integer
               routerID:
diff --git a/docs/api/bgp.md b/docs/api/bgp.md
index 09871e7..ff6b7aa 100644
--- a/docs/api/bgp.md
+++ b/docs/api/bgp.md
@@ -781,7 +781,7 @@ _Appears in:_
 | `routerID` _string_ | RouterID is a unique 32-bit identifier expressed in IPv4 dotted-decimal notation.<br />In an IPv6-only underlay this is a logical identifier only. |  | Format: ipv4 <br />Required: \{\} <br /> |
 | `addressFamilies` _[AddressFamily](#addressfamily) array_ | AddressFamilies defines the address families this router activates. |  | MinItems: 1 <br /> |
 | `srv6Locator` _string_ | SRv6Locator is the SRv6 locator block this router owns, expressed as an<br />IPv6 CIDR (e.g. "2001:db8:ff01::/48"). Individual SRv6 endpoint SIDs are<br />host addresses within this block. |  |  |
-| `nodeID` _integer_ | NodeID is this router's 8-bit slot within its PoP's SRv6Locator block,<br />used for RFC 9800 NEXT-CSID compression. Unique within the PoP.<br />Values 0 and 255 are reserved. |  | Maximum: 254 <br />Minimum: 1 <br /> |
+| `nodeID` _integer_ | NodeID is this router's 16-bit slot within its PoP's SRv6Locator block,<br />used for RFC 9800 NEXT-CSID compression. Unique within the PoP.<br />The uSID carrier format reserves 0x0000 and 0xE000-0xFFFF (the latter is<br />Function space, not Node-ID space), leaving 0x0001-0xDFFF assignable. |  | Maximum: 57343 <br />Minimum: 1 <br /> |
 | `listenPort` _integer_ | ListenPort is the TCP port this router listens on for incoming BGP<br />peer connections. Defaults to 179 (the IANA-assigned BGP port) if unset. |  | Maximum: 65535 <br />Minimum: 1 <br /> |