Configuration Guide Configuring IP Addresses and Services
Obtaining an IP Addresses through PPP Negotiation
This command is supported on point-to-point interfaces only.
Through this configuration, a point-to-point interface accepts the IP address assigned by the peer end through PPP
negotiation.
Borrowing an IP Addresses from Another Interface
One interface may not be configured with an IP address. To enable the interface, it must borrow an IP address from
another interface.
IP addresses of Ethernet interfaces, tunnel interfaces, and loopback interfaces can be borrowed. However, these
interfaces cannot borrow IP addresses from other interfaces.
The IP addresses of borrowed interfaces cannot be borrowed from other interfaces.
If a borrowed interface has multiple IP addresses, only the primary IP address can be borrowed.
The IP address of one interface can be lent to multiple interfaces.
IP addresses of borrowing interfaces are always consistent with and vary with IP addresses of borrowed interfaces.
Related Configuration
Configuring an Interface with One or More IP Addresses
By default, an interface is not configured with an IP address.
The ip address command is used to configure an IP address for an interface.
After an IP address is configured, the IP address can be used for communication when it passes conflict detection.
The ip address ip-address mask secondary command can be used to configure multiple secondary IP addresses.
The ip address ip-address mask slave command can be used to configure slave IP addresses.
Obtaining an IP Address through PPP Negotiation
By default, the interface cannot obtain an IP address through PPP negotiation.
The ip address negotiate command is used to configure IP address negotiation on a point-to-point interface.
Borrowing an IP Address from Other Interfaces
By default, an interface is not configured with an IP address.
The ip unnumbered command can be used to borrow IP addresses from other interfaces.
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