Manual

Cisco Packet Data Serving Node (PDSN) Release 2.0
Configuration Tasks
66
12.3(11)T
access-list 11 permit 10.11.1.92
access-list 12 deny 128.0.0.0 0.0.0.255
access-list 12 permit any
route-map MAP permit 10<<< only the CDMA-Ix update gets out
match ip address 11
set tag 9
route-map DENY-MAP permit 10<<< blocks 128.x.x.x internal network between
match ip address 12 the PC and sibytes on the MWAM card
set tag 9
or
summary-address 128.0.0.0 255.0.0.0 not-advertise <<< also blocks the 128 network
The ip dhcp ping packets 0 command will disable the ODAP client from sending a ping to determine
if an address is available. The ODAP default time is 2 seconds to wait for an ICMP echo reply. This will
reduce the address allocation time at the risk of detecting duplicate addresses. The ip address-pool
dhcp-pool command enables the ODAP client on the PDSN. The pool for the PDSN to use is called
pdsn-pool. The origin command tells that it is DHCP, and gives an initial size for the pool to use and a
size to grow by. In this case, both the initial and autogrow are set for a subnet size of 4096. The
utilization mark (high/low) command can be used to set a percentage of pool usage before the router
will schedule a subnet request for a new subnet, or to free a subnet that is no longer being used. The name
of the pool must also be configured on the Virtual-Template1 interface. Here is the output of the show
command.
PDSN#show ip dhcp pool
Pool pdsn-pool :
Utilization mark (high/low) : 95 / 5
Subnet size (first/next) : 20 / 20 (autogrow)
Total addresses : 4094
Leased addresses : 0
Pending event : none
1 subnet is currently in the pool :
Current index IP address range Leased addresses
13.0.64.1 13.0.64.1 - 13.0.79.254 0
The ip dhcp-server 7.0.0.96 command causes DHCP requests to go to this particular DHCP Server.
Otherwise Broadcast messages are sent to discover the DHCP Servers.
For OSPF, the redistribute static subnets command is used to aggregate the ODAP subnet routes on the
SUP. The redistribute connected subnets route-map MAP command uses an access-list functionality
to only allow the CDMA-Ix1 IP address to be known to the SUP. All other “connected subnets” routing
updates are not sent out.
Alternatively, the summary-address 128.0.0.0 255.0.0.0 not-advertise command can be used instead
of the route-map DENY-MAP permit 10 command to prevent the 128.0.0.0 route from being seen. The
route-map is similar to an access-list, so the summary-address command may be preferable and have
less impact on processor performance.
There are additional configuration details for the Catalyst 6500 Series Switch, as well as additional
commands that will assist you in configuring ODAP on the PDSN. For more information, refer to the
following Cisco 12.2 IOS documentation:
• 12.2 IOS Documentation, DHCP Server - On-Demand Address Pool Manager
• 12.2 IOS Documentation, Configuring DHCP (IOS IP configuration guide)
• 12.2 IOS Documentation, DHCP ODAP Server Support