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Sidewinder G2 6.1.2 Administration Guide - Glossary of Technical ...

Sidewinder G2 6.1.2 Administration Guide - Glossary of Technical ...

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Changing the multicast address<br />

Chapter 17: High Availability<br />

Managing an HA cluster<br />

The Edit Multicast Group window allows you to specify different multicast<br />

addresses for an HA cluster. Do not specify an address that conflicts with other<br />

multicast groups on the heartbeat burb. Addresses in the range <strong>of</strong> 239.192.0.0<br />

to 239.251.255.255 have been reserved by RFC 2365 for locally administered<br />

multicast addresses. Boundary routers should be configured to not pass your<br />

selected address if such a feature exists.<br />

To restore the default address (239.192.0.1), click Restore Default.<br />

Important: If the default is not used, you should change the reverse lookup files in<br />

DNS to allow DNS reverse resolution <strong>of</strong> the multicast address. Refer to the<br />

/etc/namedb.u/failover.rev file.<br />

Configuring an entry in the Force ARP Reset area<br />

The Force ARP Reset window allows you to specify the IP address and its<br />

associated burb for each system that would ignore the gratuitous ARP<br />

containing the new cluster alias. To add this information, follow the steps<br />

below.<br />

Note: The Force ARP Reset area is not used for load sharing HA.<br />

1 In the IP Address field, enter the system’s IP address.<br />

2 In the Burb field, select the burb that connects to that system’s network.<br />

3 Click OK to save the information, or click Close to close the window without<br />

saving your changes.<br />

Configuring an entry in the Interfaces table<br />

The Common IP window allows you to specify the cluster common IP address<br />

for your interfaces. You will need to configure a common IP address for each<br />

interface that uses HA. Follow the steps below.<br />

Note: Be sure to add the common IP address and the associated domain name to<br />

your DNS service.<br />

1 In the Burb drop-down list, select the appropriate burb.<br />

Note: The Network Address field displays the local IP address for this<br />

<strong>Sidewinder</strong> <strong>G2</strong>.<br />

2 In the Common IP Address field, type the common IP address for the<br />

interface that is shared between the primary and secondaries when they<br />

become active.<br />

The cluster address is the address most systems should use to communicate<br />

with or through the <strong>Sidewinder</strong> <strong>G2</strong>, meaning that DNS, default routes,<br />

etc. need to know this address.<br />

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