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Configuring Mobile IP
Mobile IP Configuration Examples
IPC-181
Cisco IOS IP Configuration Guide
Figure 30 Topology Showing HA Redundancy on a Physical Network
HA1 is favored to provide home agent service for mobile nodes on physical network e0 because the
priority is set to 110, which is above the default of 100. HA1 will preempt any active home agent when
it comes up. During preemption, it does not become the active home agent until it retrieves the mobility
binding table from the current active home agent or until 100 seconds expire for home agent
synchronization.
Note If the standby preempt command is used, the preempt synchronization delay must be set or mobility
bindings cannot be retrieved before the home agent preempts to become active.
The standby HSRP group name is SanJoseHA and the HSRP group address is 1.0.0.10. The standby HA
uses this HSRP group address to retrieve mobility bindings for mobile nodes on the physical network.
Mobile IP is configured to use the SanJoseHA standby group to provide home agent redundancy.
Mobile nodes are configured with HA address 1.0.0.10. When registrations come in, only the active
home agent processes them. The active home agent sends a mobility binding update to the standby home
agent, which also sets up a tunnel with the same source and destination endpoints. Updates and table
retrievals are authenticated using the security associations configured on the home agent for its peer
home agent. When packets destined for mobile nodes are received, either of the home agents tunnel
them. If HA1 goes down, HA2 becomes active through HSRP and will process packets sent to home
agent address 1.0.0.10.
HA1 Configuration
interface ethernet0
ip address 1.0.0.1 255.0.0.0
standby ip 1.0.0.10
standby name SanJoseHA
standby preempt delay sync 100
standby priority 110
ip mobile home-agent standby SanJoseHA
ip mobile secure home-agent 1.0.0.2 spi 100 key hex 00112233445566778899001122334455
Active
HA1
Standby
HA2
Physical
home
network
HSRP
group
address
39274
Router
Internet
1.0.0.2
1.0.0.1