BSR 2000 Configuration and Management Guide
Release 1.0
6-10
MGBI
526360-001-00 Rev. B
11.
The CPE sends a DHCP request to the cable helper-address that has been defined
for all CPEs that are connected to a CM with IP address assignment in the
isp-bind sub network. The giaddr is set to the giaddr of the secondary IP address
that has been defined for all CPEs that are connected to a CM with an IP address
in the isp-bind network.
12.
The DHCP server now responds with an IP address in a subnet that is owned by
the ISP provider.
13.
All subsequent CPEs that perform DHCP that are connected to the same CM will
be automatically assumed to have selected the same ISP.
The BSR supports an "isp-bind" option for the CLI commands
ip address
and
cable
helper-address
.
■
The "isp-bind" option for the
ip address
command allows the BSR to bind a
secondary IP address subnet, to another secondary IP address subnet.
■
The "isp-bind" option for the
cable helper-address
command allows the BSR to
bind the cable helper address with a secondary IP address subnet.
A CPE that is connected to a CM that has an IP address in the
A.B.C.D
subnet of the
isp-bind
<
A.B.C.D
> option will have the giaddr field of its DHCP requests set to the
ip address
A.B.C.D
value and will have its DHCP requests forwarded to the cable
helper-address defined for
isp-bind
A.B.C.D
.
An operator can bind a secondary IP address range that was defined for CPEs with the
giaddr of the secondary IP address range that was defined for CMs of a particular ISP
provider using the
ip address
and
cable helper address
commands. The operator
creates an internal mapping of a CM subnet, giaddr value and cable helper address.
There can be up to 128 subnets configured on each CMTS module. Since binding a
secondary IP subnet to another secondary IP subnet requires the use of two subnets
and one subnet for the primary, up to 64 ISPs can be configured for each CMTS.
After a CPE has selected an ISP, all subsequent DHCP requests will have the IP
address of the CM inserted by the CMTS module before forwarding the request to the
relay agent on the BSR. The BSR sets the giaddr field and the IP address of the DHCP
server using the CM’s IP address to determine what the value should be.
MOT(config-if)#
ip address
<
A.B.C.D
> <
A.B.C.D
> [
secondary
[
host
|
mta
] [
isp-bind
<
A.B.C.D
>]]]
where:
Содержание BSR 2000
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