Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 850)

820 Multi-Service IronWare Switching Configuration Guide
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Configuring IP load sharing
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• netbios-ns (port 137)
• ntp (port 123)
• tacacs (port 65)
• talk (port 517)
• time (port 37)
• tftp (port 69)
In addition, you can specify any UDP application by using the application’s UDP port number.
The udp-port-num parameter specifies the UDP application port number. If the application you
want to enable is not listed above, enter the application port number. You also can list the port
number for any of the applications listed above.
To disable forwarding for an application, enter a command such as the following.
Brocade(config)# no ip forward-protocol udp
This command disables forwarding of specific UDP application requests to the helper addresses
configured on Brocade device interfaces.
Configuring an IP helper address
To forward a client’s broadcast request for a UDP application when the client and server are on
different networks, you must configure a helper address on the interface connected to the client.
Specify the server’s IP address or the subnet directed broadcast address of the IP subnet the
server is in as the helper address.
You can configure up to 16 helper addresses on each interface. You can configure a helper address
on an Ethernet port or a virtual interface.
To configure a helper address on interface 2 on chassis module 1, enter the following commands.
Brocade(config)# interface e 1/2
Brocade(config-if-e1000-1/2)# ip helper-address 10.95.7.6
The commands in this example change the CLI to the configuration level for port 1/2, then add a
helper address for server 10.95.7.6 to the port. If the port receives a client request for any of the
applications that the Brocade device is enabled to forward, the Brocade device forwards the
client’s request to the server.
Syntax: [no] ip helper-address ip-addr
The ip-addr command specifies the server’s IP address or the subnet directed broadcast address
of the IP subnet the server is in.
Configuring BootP or DHCP forwarding parameters
A host on an IP network can use BootP or DHCP to obtain its IP address from a BootP or DHCP
server. To obtain the address, the client sends a BootP or DHCP request. The request is a subnet
directed broadcast and is addressed to UDP port 67. A limited IP broadcast is addressed to IP
address 255.255.255.255 and is not forwarded by the Brocade device or other IP routers.
When the BootP or DHCP client and server are on the same network, the server receives the
broadcast request and replies to the client. However, when the client and server are on different
networks, the server does not receive the client’s request, because the Brocade device does not
forward the request.