Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 95)

Brocade Virtual ADX Switch and Router Guide 81
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Configuring IP parameters
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Virtual ADX(config)# no ip load-sharing
Syntax: [no] ip load-sharing
Changing the maximum number of load sharing paths
By default, IP load sharing allows IP traffic to be balanced across up to four equal paths. You can
change the maximum number of paths the Virtual ADX supports to a value from 2 – 8.
For optimal results, set the maximum number of paths to a value at least as high as the maximum
number of equal-cost paths your network typically contains. For example, if the Virtual ADX you are
configuring for IP load sharing has six next-hop routers, set the maximum paths value to six.
NOTE
If the setting for the maximum number of paths is lower than the actual number of equal-cost paths,
the software does not use all the paths for load sharing.
To change the number of IP load sharing paths, enter a command such as the following.
Virtual ADX(config)# ip load-sharing 8
Syntax: [no] ip load-sharing [num]
The num parameter specifies the number of paths and can be from 2 – 8.
Configuring UDP broadcast and IP helper parameters
Some applications rely on client requests sent as limited IP broadcasts addressed to the UDP’s
application port. If a server for the application receives such a broadcast, the server can reply to
the client. Routers do not forward subnet directed broadcasts, so the client and server must be on
the same network for the broadcast to reach the server. If the client and server are on different
networks (on opposite sides of a router), the client’s request cannot reach the server.
You can configure the Virtual ADX to forward clients' requests to UDP application servers. To do so:
• Enable forwarding support for the UDP application port, if forwarding support is not already
enabled.
• Configure a helper adders on the interface connected to the clients. Specify the helper address
to be the IP address of the application server or the subnet directed broadcast address for the
IP subnet the server is in. A helper address is associated with a specific interface and applies
only to client requests received on that interface. The Layer 3 Switch forwards client requests
for any of the application ports the Virtual ADX is enabled to forward to the helper address.
Forwarding support for the following application ports is enabled by default.
• bootps (port 67)
• dns (port 53)
• tftp (port 69)
• time (port 37)
• netbios-ns (port 137)
• netbios-dgm (port 138)
• tacacs (port 65)