Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) User Manual
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Brocade Virtual ADX Server Load Balancing Guide
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Source NAT
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The source-ip variable is the source NAT IP address of the subnet with which you want to associate
the client subnet. The source NAT IP address you enter must be configured on the Brocade Virtual
ADX.
Enabling port allocation per real server for source NAT IP
For the Brocade Virtual ADX products, the port pools are not shared globally but are allocated to
each real server and each real server is able to use the entire pool by itself. To enable port
allocation per real server for the source NAPT IP address, use the following command.
Virtual ADX(config)#server source-nat-ip 10.10.10.5 255.255.255.0 0.0.0.0
port-range 2 port-alloc-per-real
Syntax: [no] server source-nat-ip ip-addr ip-mask default-gateway port-range 1|2
[port-alloc-per-real]
This feature is recommended for deployments with large numbers of real servers, which can lead
to a shortage of ports and necessitate configuration of additional source NAT IPs.
NOTE
This enhancement only applies to the server source-nat-ip.
NOTE
You need to write memory and reload after you configure this feature.
Consider the following when enabling port allocation per real server:
•
When you enable port allocation per real server, you must reload the Brocade Virtual ADX.
Otherwise, the SLB traffic fails.
•
The Brocade Virtual ADX does not use the source-nat-ip default-gateway parameter for remote
server health checks as well as for forwarding SLB traffic to the remote server.
•
You should not enable or disable this functionality while the IP addresses are in use by the
traffic flow. You must bring the number of traffic flows utilizing this IP address to zero or
remove the command and redefine it.
As an example, for changing from statement #1 to statement #2 below, either bring the traffic
level to nil or negate the command first using "no server...." and then re-define it.
statement #1: server ... port-range 1
statement #2: server ... port-range 1 port-alloc-per-real
•
The maximum number of configured source-nat-ip addresses that can be supported by the
“port allocation per real server” feature is 16.
You can configure the Brocade Virtual ADX to log a message when source NAT IP runs out of ports.
Syntax: [no] source-ip-log