The dhcp select global command is added to the VLANIF interface view after S series switch is upgraded

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On fixed switches running V100R003, the DHCP server function (the dhcp select global command) is enabled in the VLANIF view by default, and there is no buildrun information. On fixed switches running V100R005 or a later version, the DHCP server function is disabled in the VLANIF view by default. To ensure compatibility with earlier versions, the DHCP server function is enabled in the VLANIF view after an upgrade. If the DHCP function (the dhcp enable command) is disabled globally, the dhcp select global command will not take effect, and you can manually delete this command. If the DHCP function (the dhcp enable command) is enabled globally after the upgrade, contact Huawei technical support for help before deleting the dhcp select global command.

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The dhcp select global command is added to the VLANIF interface view after S series switch is upgraded
On fixed switches running V100R003, the DHCP server function (the dhcp select global command) is enabled in the VLANIF view by default, and there is no buildrun information. On fixed switches running V100R005 or a later version, the DHCP server function is disabled in the VLANIF view by default. To ensure compatibility with earlier versions, the DHCP server function is enabled in the VLANIF view after an upgrade. If the DHCP function (the dhcp enable command) is disabled globally, the dhcp select global command will not take effect, and you can manually delete this command. If the DHCP function (the dhcp enable command) is enabled globally after the upgrade, contact Huawei technical support for help before deleting the dhcp select global command.

DHCP address pool modes on S series switches
When an S series switch excluding the S1700 functions as the DHCP server, the switch supports the interface-based and global address pools. - Interface-based address pool The interface address pool is on the network segment where the primary IP address of an interface is located. The DHCP server can only select and assign IP addresses on the network segment to clients. - Global address pool 1. If the DHCP server is on the same network segment as clients (no relay agent is deployed), the DHCP server selects IP addresses in the address pool on the network segment where the primary IP address of the interface connected to clients is located. If the interface is not configured with the primary IP address or no address pool is on the same network segment as the primary IP address, clients cannot request IP addresses. 2. If the DHCP server and clients are on different network segments (a relay agent is deployed), the DHCP server parses the received IP address (the primary IP address of the first interface configured with the relay function) specified by the giaddr field in the DHCP Request message, and selects the address pool on the same network segment as the IP address to assign addresses. If the IP address does not match the corresponding address pool, clients cannot request IP addresses. Follow the preceding rules to ensure that a client can obtain an IP address.

The difference of configuring CAR at interface view and global on S series switch box device
For the S series frame switch, the interface configuration of the CAR only limit the interface speed. When configure CAR at system view and define slot parameter, all interface of this slot will share this CAR. When configure CAR at sysetem view without defining slot parameter, all interfaces on every board share this CAR. For example, configured inbound CAR as 5000kbit/s: - If this is applied to the interface, the speed limit is only for this interface. This interface can receive up to 5000kbit/s. - If this is configured at system view and specified slot parameter, the sum rate of all the interfaces on this slot on the board is 5000kbit/s; - If this is configured at system view without specified slot parameter, the rate at all the interfaces on this device receive packets is up to 5000kbit/s.

Check DHCP IP address lease on S series switch
On S series switches except S1700 switches, you can view the lease of IP addresses in an address pool as follows: - If an interface address pool is used, run the display ip pool interface interface-pool-name [ start-ip-address [ end-ip-address ] ] command. - If a global address pool is used, run the display ip pool name ip-pool-name [ start-ip-address [ end-ip-address ] ] command. The Lease field in the command output indicates the lease of IP addresses.

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