Typical Application - Vpn Failover Using Object Tracking; Typical Application - Backup For The Wan Fast Ethernet Interface - Avaya G250 Administration

Typical application – VPN failover using object tracking
In this application, the G250/G350 is connected to a remote site through an IPSec VPN tunnel.
The remote site can be reached through two or more VPN gateways that can backup each
other, such as a main gateway and a backup gateway. Object tracking can monitor the state of
the current VPN connection, by monitoring one or more hosts that reside within the remote
site's network. If the current connection is lost, the G250/G350 can failover to a backup
gateway, and try to re-establish a VPN connection to it.
A typical application of this type is described in full in
Figure 21: Failover VPN topology using object tracking
Avaya GW
Branch G350
Office
Typical application – backup for the WAN Fast Ethernet interface
This typical application illustrates the use of object tracking as a backup mechanism for PPPoE
configured on the WAN Fast Ethernet interface. A track list monitors the state of the connection.
If the WAN Fast Ethernet interface is down, another connection is used.
In this application, the G250/G350 is connected to an xDSL modem via PPPoE encapsulation
configured on interface WAN FastEthernet 10/2. The G250/G350 is connected to the Internet
via the xDSL modem.
To configure the backup mechanism:
1. Define four RTRs to probe the four entrances to the main office. Configure each RTR to run
immediately and forever.
2. Define four object trackers to track the four RTRs.
Main Office
Ethernet
DSL or
Cable
modem
Failover using a peer-group
Access Router
+ VPN
termination
Internet
Access Router
+ VPN
termination
Backup Gateway
Object tracking
on page 431.
Main Gateway
Host
Host
Corporate
Intranet
Host
Issue 1.1 June 2005
Host
Host
181