3Com 10014299 manual By default, the interface has no negotiating IP address, Pool pool-number

322CHAPTER 20: CONFIGURING IP ADDRESS

Table 354 Set negotiable attribute of IP address for an interface

Operation	Command
Set PPP negotiable attribute of IP address for an	ip address ppp-negotiate
interface
Cancel negotiable attribute of IP address for an	undo ip address
interface	ppp-negotiate
Assign IP address for the peer interface	remote address { ip-address
	pool [ pool-number ] }
Cancel IP address for the peer interface	undo remote address

By default, the interface has no negotiating IP address.

Note the following:

■Because PPP supports IP address negotiation, IP address negotiation of an interface can be set only when the interface is encapsulated with PPP. When the PPP is DOWN, the IP address originated from negotiation will be deleted.

■If the interface has an original address, then after setting IP address of the interface to negotiable, the original IP address will be deleted.

■After setting IP address of an interface to negotiable, it is unnecessary to configure IP address for the interface, as negotiation will automatically originate an IP address.

■After setting IP address of an interface to negotiable, if the interface is set to negotiable again, then the IP address originated from the original negotiation will be deleted, and the interface obtains IP address through the re-negotiation.

■The interface will have no address after the negotiation address is deleted.

Configure IP Address

Unnumbered for an

Interface

Introduction to IP address unnumbered

Borrowing IP address will save IP address resources. If an interface has no IP address, it can neither generate any route nor forward any message. “IP Address Unnumbered” is used when you want to use an interface with no IP address. In such case, an IP address will be borrowed from another interface. If the lending interface has multiple IP addresses, then only the master one can be borrowed. However, if the lending interface has no IP address, then the IP address of the borrowing interface is 0.0.0.0. This function is implemented through the command ip address unnumbered.

Note the following:

■The borrower can not be an Ethernet interface

■The address of the lending interface cannot be lent by the borrowed interface.

■The lending interface can lend its address to multiple interfaces.

Because the borrowing interface has no IP address of its own, and can not route, two routes need to be configured manually to connect routers.

IP address unnumbered configuration includes:

■ Activate/deactivate IP address unnumbered.

1Activate/deactivate IP address unnumbered Perform the following task in the interface view,