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Configuring Mobile IP
Mobile IP Configuration Examples
IPC-187
Cisco IOS IP Configuration Guide
Figure 32 Topology Showing HA Redundancy on Multiple Virtual Networks Using One Physical
Network (Same Subnet)
Mobile Node and Home Agent on Different Subnets
HA1 and HA2 share responsibility for providing home agent service for mobile nodes on virtual
networks 20.0.0.0 and 30.0.0.0. The home agents are connected on only one physical network.
The standby group name is SanJoseHA and the HSRP group address is 1.0.0.10. Mobile IP is configured
to use the SanJoseHA standby group to provide home agent redundancy. Thus, HSRP allows the home
agent to receive packets destined to 1.0.0.10.
This configuration differs from the physical network example in that a global HA address must be
specified to support virtual networks. This address is returned in registration replies to the mobile node.
HA1 Configuration
interface ethernet0
ip address 1.0.0.1 255.0.0.0
standby ip 1.0.0.10
standby name SanJoseHA
! specifies global HA address=HSRP group address to be used by all mobile nodes
ip mobile home-agent address 1.0.0.10
ip mobile virtual-network 20.0.0.0 255.0.0.0
ip mobile virtual-network 30.0.0.0 255.0.0.0
! used to map to the HSRP group SanJoseHA
ip mobile home-agent standby SanJoseHA virtual-network
ip mobile secure home-agent 1.0.0.2 spi 100 key hex 00112233445566778899001122334455
HA2 Configuration
interface ethernet0
ip address 1.0.0.2 255.0.0.0
Active
HA1
Standby
HA2
Physical
home
network
Router
Internet
Foreign
agent
HSRP
group
address
Loopback
interface
44138
Virtual
networks
1.0.0.2
1.0.0.1