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.

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