Number of global address pools supported by the AR

16

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How is global address pool modified on an AR
A Huawei AR allows the global address pool to be changed using command lines. Assume that the global address pool is on the network segment 10.1.1.0/24 and the network segment needs to be changed to 10.1.2.0/24. Perform the following configurations: [Huawei] ip pool pool1 [Huawei-ip-pool-pool1] undo network //Delete the original network segment. [Huawei-ip-pool-pool1] network 10.1.2.0 mask 255.255.255.0 //Configure the current network segment.

Configure a DHCP global address pool
Configure a DHCP global address pool on a CE series switch as follows:
<HUAWEI> system-view
[~Huawei] dhcp enable //Enable DHCP globally.
[*Huawei] commit
[~Huawei] ip pool pool1 //Create a global address pool and enter its view.
[*Huawei-ip-pool-pool1] gateway-list 10.1.1.1 //Configure the egress gateway address for the global address pool of a DHCP server.
[*Huawei-ip-pool-pool1] network 10.1.1.0 mask 255.255.255.128 //Configure the range of IP addresses that can be allocated dynamically from a global address pool.
[*Huawei-ip-pool-pool1] dns-list 10.1.1.2 //Configure an IP address for the DNS server used by DHCP clients.
[*Huawei-ip-pool-pool1] excluded-ip-address 10.1.1.2 //Configure an IP address that cannot be automatically allocated from the global address pool.
[*Huawei-ip-pool-pool1] lease day 10 //Configure a lease for the IP address.
[*Huawei-ip-pool-pool1] commit
[~Huawei-ip-pool-pool1] quit

Configure the DHCP server based on the global address pool on the AR
An IP address pool is created in the system view on a DHCP server. In the interface view, the server is configured to allocate IP addresses, gateway addresses, and DNS server addresses to clients based on the global address pool. This mode applies to the scenario where the DHCP server and clients are on different network segments (a DHCP relay agent exists), or the DHCP server and clients are on the same subnet but the server needs to assign IP addresses to the clients connected to multiple interfaces. Perform the following configuration: [Huawei] dhcp enable //Enable the DHCP function. [Huawei] ip pool pool1 //Configure a global address pool. [Huawei-ip-pool-pool1] network 10.1.1.0 mask 255.255.255.0 //Specify the range of IP addresses that can be dynamically allocated. [Huawei-ip-pool-pool1] gateway-list 10.1.1.1 // Set the gateway IP address. [Huawei-ip-pool-pool1] quit [Huawei] interface ethernet 1/0/0 //Enter the view of the interface of the DHCP server connected to the client. [Huawei-Ethernet1/0/0] undo portswitch //Switch the interface to Layer 3 mode. [Huawei-Ethernet1/0/0] ip address 10.1.1.1 255.255.255.0 //Configure the same subnet as the address pool. [HUAWEI-Vlanif100] dhcp select global // Enable the DHCP server to assign IP addresses to clients from the global address pool.

Check address allocation on S series switch
On S series switches except S1700 switches, you can view information about 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 ] | all | conflict | expired | used ] ] command. - If a global address pool is used, run the display ip pool [ name ip-pool-name [ start-ip-address [ end-ip-address ] | all | conflict | expired | used ] ] command. You can configure fields in the command as required: - To view information about all IP addresses in an address pool, specify all. - To view information about conflicting IP addresses in an address pool, specify conflict. - To view information about expired and idle IP addresses in an address pool, specify expired. - To view information about used IP addresses in an address pool, specify used. - To view information about a specific IP address or an IP address range in an address pool, specify start-ip-address [ end-ip-address ].

How is IP address range increased on an AR
When addresses in the address pool are insufficient, use the following methods:
- Increase the mask.
[Huawei] ip pool global1
[Huawei-ip-pool-global1] undo network
[Huawei-ip-pool-global1] network 192.168.0.0 mask 16 //Change the mask from 24-bit mask 255.255.255.0 to 16-bit mask 255.255.0.0.
There are great changed. The mask on the DHCP client needs to be changed to 16-bit.
- Create an address pool and configure the primary address of the interface as the address on the network segment.
[Huawei] ip-pool new_p //Create an address pool.
[Huawei-ip-pool-new_p] network 192.168.2.0 mask 255.255.255.0
[Huawei-ip-pool-new_p] quit
[Huawei] interface gigabitethernet1/0/0
[Huawei-GigabitEthernet1/0/0] ip address 192.168.2.1 255.255.255.0 //Configure the same network segment of new addresses as that of the primary IP address.
[Huawei-GigabitEthernet1/0/0] ip address 192.168.1.1 255.255.255.0 sub //Configure the same network segment of new addresses as that of the secondary IP address.
Automatically allocated addresses are addresses on the new network segment.

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