Configuring ip parameters – Brocade BigIron RX Series Configuration Guide User Manual
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BigIron RX Series Configuration Guide
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Configuring IP parameters
7
Configuring IP parameters
Some parameters can be configured globally while others can be configured on individual
interfaces. Some parameters can be configured globally and overridden for individual interfaces.
IP Maximum
Transmission Unit
(MTU)
The maximum length (number of bytes) of an encapsulated IP
datagram the router can forward.
1500 for Ethernet II
encapsulated packets
1492 for SNAP encapsulated
packets
ARP age
Locally overrides the global setting. Refer to
Ten minutes
Metric
A numeric cost the router adds to RIP routes learned on the
interface. This parameter applies only to RIP routes.
1 (one)
Directed broadcast
forwarding
Locally overrides the global setting. Refer to
Disabled
ICMP Router
Discovery Protocol
(IRDP)
Locally overrides the global IRDP settings. Refer to
Disabled
ICMP Redirect
messages
Locally overrides the global setting. Refer to
Enabled
DHCP gateway stamp The router can assist DHCP/BootP Discovery packets from one
subnet to reach DHCP/BootP servers on a different subnet by
placing the IP address of the router interface that receives the
request in the request packet’s Gateway field.
You can override the default and specify the IP address to use for
the Gateway field in the packets.
NOTE: UDP broadcast forwarding for client DHCP/BootP requests
(bootpc) must be enabled and you must configure an IP
helper address (the server’s IP address or a directed
broadcast to the server’s subnet) on the port connected to
the client.
The lowest-numbered IP
address on the interface that
receives the request
UDP broadcast
forwarding
The router can forward UDP broadcast packets for UDP
applications such as BootP. By forwarding the UDP broadcasts,
the router enables clients on one subnet to find servers attached
to other subnets.
NOTE: To completely enable a client’s UDP application request to
find a server on another subnet, you must configure an IP
helper address consisting of the server’s IP address or the
directed broadcast address for the subnet that contains
the server. See the next row.
The router helps forward
broadcasts for the following
UDP application protocols:
•
bootps
•
dns
•
netbios-dgm
•
netbios-ns
•
tacacs
•
tftp
•
time
IP helper address
The IP address of a UDP application server (such as a BootP or
DHCP server) or a directed broadcast address. IP helper
addresses allow the router to forward requests for certain UDP
applications from a client on one subnet to a server on another
subnet.
None configured
a.
Some devices have a factory default, such as 209.157.22.154, used for troubleshooting during installation. For the device, the address is
on module 1 port 1 (or 1/1).
TABLE 47
IP interface parameters (Continued)
Parameter
Description
Default
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