Nortel Networks 8000 - Manual (Page 375)

Nortel Secure Router 8000 Series
Configuration -WAN Access 9 HDLC configuration
The system view appears.
Step 2 Run:
interface interface-type interface-number
The interface view appears.
Step 3 Run:
link-protocol hdlc
The command configures the interface with HDLC.
—End
9.2.3 Configuring the IP address of the interface
Do as follows on the routers:
Step 1 Run:
system-view
The system view appears.
Step 2 Run:
interface interface-type interface-number
The interface view appears.
Step 3 Choose one of the following steps to configure the IP address or IP unnumbered address of
the interface as required.
• Run the ip address ip-address { mask | mask-length } [ sub ] command to configure the
IP address of the interface.
When using HDLC, the IP address of the interface must be in the same network segment with
the IP address of the peer interface.
• Run the ip address unnumbered interface interface-type interface-number command to
configure the IP unnumbered address.
—End
OQ NOTE
If you configure IP address unnumbered on an interface encapsulated with HDLC, the borrower must
have the ability to learn the route to the remote end. Otherwise, it cannot reach the remote end.
When you use IP address unnumbered, you can configure static route or dynamic routing
protocol to make the borrower learn the route to the remote end.
Note the following principles:
• If you use dynamic routing protocol, ensure the length of the learned route mask is
longer than that of the lender's IP address mask, because the SR8000 adopts the principle
of longest match in routing lookup.
• If you use static route and the IP address of the lender adopts 32-bit mask, the length of
the static route mask should be shorter than 32 bits.
Issue 5.3 (30 March 2009) Nortel Networks Inc. 9-3