IP Addressing

FDL Connection ± Extending Subnet for FDL

In this example:

HDSU/CSU A is connected to the NMS on LAN A through the 10BaseT port.

HDSU/CSU A is connected to DSU/CSU B through the FDL.

HDSU/CSU B is addressed through the FDL as if it existed on LAN A.

HDSU/CSU A forwards all data to DSU/CSU B using Proxy ARP.

HA proprietary RIP is used to learn the IP addresses of the remote FDL interfaces. It can take up to 5 minutes for the RIP protocol to exchange addresses once the FDL is active.

Subnet 135.18.5.0

Subnet 140.20.10.0

NMS A

 

NMS B

 

 

 

135.18.5.2

 

 

135.18.5.1

Router

 

140.20.10.1

 

 

 

Ethernet IP

 

140.20.10.2

 

Address:

 

T1

 

135.18.5.3

 

Network

 

7112

FDL

Router

 

 

 

DSU/CSU

FDL IP

 

 

A

Address:

FDL IP

Ethernet IP

 

 

140.20.10.4

Adress:

Address:

 

 

135.18.5.4

140.20.10.3

 

 

7112

 

 

 

DSU/CSU

 

 

 

B

 

LAN A

 

LAN B

97-15699-01

7112-A2-GB20-20

March 1998

5-3

Page 39
Image 39
Paradyne 7112 manual FDL Connection ± Extending Subnet for FDL, NMS a NMS B