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Configuring Mobile IP
Mobile IP Configuration Examples
IPC-184
Cisco IOS IP Configuration Guide
Mobile nodes are configured with a home agent address 10.0.0.10. When registrations come in, either
home agent processes them (depending on routing protocols) and updates the peer home agent. The
home agent that receives the registration finds the first HSRP group that is mapped to 10.0.0.10 with a
peer in the group and sends the update out that interface. If there is a network problem (for example, the
home agent network adapter fails or cable disconnects), HSRP notices the absence of the peer. The home
agent does not use that HSRP group and finds another HSRP group to use.
Note All routers must have identical loopback interface addresses, which will be used as the global HA
address. However, do not use this address as the router ID for routing protocols.
When the peer home agent receives the registration update, both home agents tunnel the packets to the
mobile nodes.
HA1 Configuration
interface ethernet0
ip address 1.0.0.1 255.0.0.0
standby ip 1.0.0.10
standby name SanJoseHANet1
interface ethernet1
ip add 2.0.0.1 255.0.0.0
standby ip 2.0.0.10
standby name SanJoseHANet2
interface loopback0
ip address 10.0.0.10 255.255.255.255
!Specifies global HA address=loopback address to be used by all mobile nodes
ip mobile home-agent address 10.0.0.10
ip mobile virtual-network 20.0.0.0 255.0.0.0
! Used to map to the HSRP group SanJoseHANet1
ip mobile home-agent standby SanJoseHANet1 virtual-network
! Used to map to the HSRP group SanJoseHANet2
ip mobile home-agent standby SanJoseHANet2 virtual-network
ip mobile secure home-agent 1.0.0.2 spi 100 key hex 00112233445566778899001122334455
ip mobile secure home-agent 2.0.0.2 spi 100 key hex 00112233445566778899001122334455
HA2 Configuration
interface ethernet0
ip address 1.0.0.2 255.0.0.0
standby ip 1.0.0.10
standby name SanJoseHANet1
interface ethernet1
ip address 2.0.0.2 255.0.0.0
standby ip 2.0.0.10
standby name SanJoseHANet2
interface loopback0
ip address 10.0.0.10 255.255.255.255
!Specifies global HA address=loopback address to be used by all mobile nodes
ip mobile home-agent address 10.0.0.10
ip mobile virtual-network 20.0.0.0 255.0.0.0
! Used to map to the HSRP group SanJoseHANet1
ip mobile home-agent standby SanJoseHANet1 virtual-network
! Used to map to the HSRP group SanJoseHANet2
ip mobile home-agent standby SanJoseHANet2 virtual-network