IP Address Allocation
5-8
8000-A2-GB21-20
November 1997
Peer IP Addresses
The s1b backplane ports are configured with peer IP addresses. Peer IP
addresses are used to indicate directly-connected systems.
For the MCC card’s s1b (backplane) interface, the peer IP address should be
set to indicate the subnet encompassing the DSL cards and RTUs.
The following illustration shows a HotWire DSLAM system configured with
one MCC card and four DSL cards.
97-15468-01
MCC Card
s1b base address:
135.1.3.1/255.255.255.0
peer IP address:
135.1.3.0
net
DSLAM System
System Backplane Bus
DSL Card 1
s1b: 135.1.3.2/255.255.255.0
DSL Card 2
s1b: 135.1.3.7/255.255.255.0
DSL Card 3
s1b: 135.1.3.12/255.255.255.0
DSL Card 4
s1b: 135.1.3.17/255.255.255.0
— The IP address of the MCC card’s s1b interface is 135.1.3.1.
— The IP addresses of the DSL card’s s1b interfaces are all in the same
subnet (135.1.3).
— Therefore, the directly connected peer subnet is its peer IP address,
135.1.3.0.
NOTE:
For structured subnetting on the backplane, the peer IP address must be the
first in the subnet. For example, if s1b has an IP address of 135.1.3.65 and a
subnet mask of 255.255.255.192, then the peer IP address must be
135.1.3.64.
For the DSL card’s s1c through s1f interfaces, the peer IP address should be
set to indicate the management IP address of the directly connected 5446
RTU. (Peer IP addresses need to be set for 5446 RTUs only. They do not
apply to any other RTU type.)
The peer address for the DSL card is a host route because the peer address
identifies a specific 5446 RTU. Specifically, the peer address of each DSL
card’s DSL port is the HotWire 5446 RTU’s management IP address. The
peer address is assigned to the 5446 RTU through Internet Protocol Control
Protocol (IPCP) negotiation.
