Alteon Application Switch Operating System Application Guide
High Availability
530
Document
ID:
RDWR-ALOS-V2900_AG1302
In this configuration, if a link between a device and a server fails, the server fails health checks
and its backup (attached to the other device) goes online. If a link between a device and its
Internet router fails, the protocol used to distribute traffic between the routers (for example,
OSPF) reroutes traffic to the other router. Since all traffic enters the virtual server router on one
device, that device processes all incoming connections.
If an entire master device fails, the backup detects this failure because it no longer receives
advertisements. The backup assumes the master's responsibility of responding to ARP requests
and issuing advertisements.
For more information, see
To configure the second Alteon device, page 534
Note:
The maxconn metric is not shared between devices. Therefore, if a server is used for normal
operation by one device and is activated simultaneously as a backup by the other device, the total
number of possible connections to that server is the sum of the maximum connection limits defined
for it on both devices.
To configure background configuration
In this procedure, you perform the following:
•
Define IP interfaces
•
Define VLANs
•
Disable the Spanning Tree protocol
•
Verify that IP forwarding is enabled
1. Define the IP interfaces. Alteon needs an IP interface for each subnet to which it will be
connected so it can communicate with devices attached to it. Each interface needs to be placed
in the appropriate VLAN. In this example, Interfaces 1, 2, 3, and 4 are in VLAN 2 and Interface
5 is in VLAN 3.
Note:
In Alteon, you may configure more than one subnet per VLAN.
To configure the IP interfaces for this example, enter the following commands from the CLI:
Repeat the commands for each of the following interfaces:
—
IF 2—20.10.10.10
—
IF 3—30.10.10.10
—
IF 4—40.10.10.10
—
IF 5—200.1.1.10
>> Main# /cfg/l3/if 1
(Select IP interface 1)
>> IP Interface 1 # addr 10.10.10.10
(Assign an IP address to the
interface)
>> IP Interface 1 # vlan 2
(Assign a VLAN to the interface)
>> IP Interface 1 # ena
(Enable IP interface 1)
