Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 133)

Brocade Virtual ADX Server Load Balancing Guide 117
53-1003247-01
Miscellaneous options
2
To disable TCP fast aging and use the 1- to 2- minute aging time from previous releases, enter the
following command.
Virtual ADX(config)#server no-tcp-fast-age-on-server-reset
Syntax: [no] server no-tcp-fast-age-on-server-reset
Server opt-enable-route recalculation
For optimized SLB, the Brocade Virtual ADX does not calculate a reverse route for every packet in a
flow. In this scenario, the Brocade Virtual ADX uses the route that it learns in the first reverse
packet, such as SYN-ACK packet. However, this calculation might not be desirable in a environment
where a route can be dynamically changed, such as a case with upstream firewall failover, where
the new firewall has the same IP address but a different MAC address. To cover these cases, the
server opt-enable-route-recalculation command is used to force the Brocade Virtual ADX to
dynamically calculate the reverse route.
In the case where the Server ADX only has Layer 4 SLB functionality, it will select an optimized way
to accelerate the session handling by creating data sessions and remaining with the same ports for
forwarding and reverse data traffic when the Brocade Virtual ADX receives the SYN packet. If later
on, traffic needs to go through different ports, the traffic will fail. The server
opt-enable-route-recalculation command is used to solve this problem by routing data out of the
ports after recalculating the route. By enabling this command, however, the network performance
will be affected.
NOTE
This command should be used only when there is a need to recalculate reverse route. Most
situations do not require this.
Enabling use of the client MAC address
By default, the Brocade Virtual ADX uses the MAC address of its default gateway as the destination
MAC address for server replies (TCP SYN and TCP SYN ACK) to a client. You can enable use of the
client MAC address instead of the default gateway address, by entering the following command.
Virtual ADX(config)#server l7-dont-use-gateway-mac
Syntax: [no] server l7-dont-use-gateway-mac
Enabling transparent VIP
Transparent VIP allows you to configure a Brocade Virtual ADX to transparently load balance a VIP,
without owning the VIP address. Multiple Brocade Virtual ADX devices on which this virtual server is
configured to be transparent can load balance requests for the server.
To configure an individual virtual server for the transparent VIP feature, enter a command such as
the following.
Virtual ADX(config-vs-TransVIP)#transparent-vip
Syntax: [no] transparent-vip