Cisco Systems 78-11741-02 manual Mobile Node and Home Agent on Same Subnet, IPC-183

Configuring Mobile IP

Mobile IP Configuration Examples

Mobile Node and Home Agent on Same Subnet

In this example, a loopback address is configured on the HA to be on the same subnet as the virtual network. A mobile node on a virtual network uses the HA IP address=loopback address configured for the virtual network. When a standby HA comes up, it uses this HA IP address to retrieve mobility bindings for mobile nodes on the virtual network.

HA1 Configuration

interface ethernet0

ip address 1.0.0.1 255.0.0.0 standby ip 1.0.0.10 standby name SanJoseHA

!loopback to receive registration from MN on virtual-network interface loopback0

ip address 20.0.0.1 255.255.255.255

ip mobile home-agent

!address used by Standby HA for redundancy (update and download) ip mobile virtual-network 20.0.0.0 255.0.0.0 address 20.0.0.1 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 standby ip 1.0.0.10 standby name SanJoseHA

!loopback to receive registration from MN on virtual-network interface loopback0

ip address 20.0.0.1 255.255.255.255

ip mobile home-agent

!address used by Standby HA for redundancy (update and download) ip mobile virtual-network 20.0.0.0 255.0.0.0 address 20.0.0.1 ip mobile home-agent standby SanJoseHA virtual-network

ip mobile secure home-agent 1.0.0.1 spi 100 key hex 00112233445566778899001122334455

HA Redundancy for a Virtual Network Using Multiple Physical Networks Example

This section presents two configuration examples:

•The mobile node and home agent are on different subnets.

•The mobile node and home agent are on the same subnet.

Mobile Node and Home Agent on Different Subnets

HA1 and HA2 share responsibility in providing home agent service for mobile nodes on virtual network

20.0.0.0.Both home agents are configured with a global home agent address of 10.0.0.10, which is the address of their loopback interface. This configuration allows home agents to receive registration requests and packets destined to 10.0.0.10.

The loopback address is used as the global HA address instead of the HSRP group addresses 1.0.0.10 and 2.0.0.10 to allow the HAs to continue serving the virtual network even if either physical network goes down.

Cisco IOS IP Configuration Guide

IPC-183