Aslb Configuration Guidelines - Cisco WS-C6506 Software Manual

Configuring ASLB on the Switch

ASLB Configuration Guidelines

This section lists the usage guidelines and restrictions for configuring ASLB:
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For configuration examples, see the
into problems during your configuration, see the
page
Routers
The router configuration guidelines are as follows:
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Servers
The server configuration guidelines are as follows:
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To accelerate the client-to-server traffic, you must configure the servers to ignore the ARP requests for
Caution
the virtual-IP address. If you fail to do this step, traffic acceleration does not start, and fully redundant
topologies in your network take a long time to recover from a LocalDirector failure.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
54-8
Routers, page 54-8
Servers, page 54-8
IP Addresses, page 54-9
Supervisor Engine, page 54-9
Backup LocalDirector Configuration (Optional), page 54-9
MSFC and Multilayer Switching, page 54-10
NetFlow Data Export, page 54-10
VLANs, page 54-10
Switch Port Configuration, page 54-10
54-25.
The router must be the default gateway for the servers that are being load balanced, and its MAC
address must be known.
Multiple routers must be on the same router VLAN. Specify all the participating router MAC
addresses by entering the set lda mac router command.
When ASLB is configured, a VLAN access control list (VACL) is created to redirect the TCP traffic
on the two VLANs to which the LocalDirector is connected; no security Cisco IOS access control
lists (ACLs) or VACLs can be configured on these VLANs.
The servers must be either directly attached to the switch or within the same bridging domain as the
LocalDirector port in the server VLAN.
Configure the server default route as the aliased address of the router that is on the same subnet as
the real IP address of the server.
Configure the servers to ignore the ARP requests for the virtual-IP address. On some server
operating systems, you cannot disable the responses to the ARP requests on the alias (secondary) IP
addresses. Use the static ARP entries at the routers as a workaround for the servers that respond to
the ARP requests for the virtual-IP address.
"ASLB Configuration Example" section on page
"Troubleshooting the ASLB Configuration" section on
Chapter 54 Configuring ASLB
54-18. If you run
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