Technical information
Cuda 12000 IP Access Switch CudaView Administration Guide
Creating Network-Layer Bridges 415
Creating Network-Layer Bridges
The key to spanning a single subnet across multiple DOCSIS modules is to
configure the same IP gateway on each module. The gateway serves as the
key that dictates address assignment for cable modems and CPE devices, as
a result, configuring the same IP gateway on each cable interface enables
the DHCP server to assign those devices IP addresses from the same subnet
or subnet pool.
This means that cable modems attached to a DOCSIS module in slot 1 can
belong to the same subnet as the cable modems attached to a DOCSIS
module in slot 8. You can then physically move modems between DOCSIS
modules without assigning new addresses; the shift of cable modems
between modules becomes plug and play.
To span a subnet across multiple cable interfaces, perform the following
steps. These steps are described in the appropriate sections that follow:
1. Create a bridge group.
2. Add the interfaces on which you want to install the same gateway to the
bridge group.
3. Assign the IP address that you want to use as the cable modem, CPE, and
MTA gateway to the bridge group. Note that the address that you assign
to the bridge group is automatically added to the routing table.
4. Configure the DHCP relay agent on each cable interface so that the IP
address is configured as the cable modem, CPE, and/or MTA gateway.