docs: add description about relation of cidr and static ip allocation

kubeovn · Nov 20, 2019 · 446999f · 446999f
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diff --git a/docs/install.md b/docs/install.md
@@ -37,6 +37,9 @@ If you want to enable IPv6 on default subnet and node subnet, please apply https
 
 ## More Configuration
 
+Kube-OVN will use subnet to manage pod ip address allocation, so the kube-controller-manager flag `cluster-cidr` will not take effect.
+You can use `--default-cidr` flags below to config default Pod CIDR or create a new subnet with desired CIDR later.
+
 ### Controller Configuration
 
 ```bash

diff --git a/docs/static-ip.md b/docs/static-ip.md
@@ -26,7 +26,7 @@ spec:
 
 **Note**:
 
-1. The address **SHOULD** be in the CIDR of related switch.
+1. The address **SHOULD** be in the CIDR of related subnet.
 2. The address **SHOULD NOT** conflict with addresses already allocated.
 3. The static MAC address is optional.
 
@@ -65,5 +65,6 @@ spec:
 
 1. The address **SHOULD** be in the CIDR of the related switch.
 2. The address **SHOULD NOT** conflict with addresses already allocated.
-3. If the `ip_pool` size is smaller than the replica count, some Pods will not start.
-2. Care should be taken for scaling and updates to ensure there are addresses available for new Pods.
+3. If the address size is larger than replica count, the unused address might be acquired by other Pods.
+4. If the `ip_pool` size is smaller than the replica count, some Pods will not start.
+5. Care should be taken for scaling and updates to ensure there are addresses available for new Pods.