Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare Switching Configuration Guide
53-1003036-02
Basic IP parameters and defaults
19
Encapsulation
type
The format of the packets in which the device
encapsulates IP datagrams. The encapsulation
format can be one of the following:
•
Ethernet II
•
SNAP
Ethernet II
IP Maximum
Transmission Unit
(MTU)
The maximum length (number of bytes) of an
encapsulated IP datagram the device can forward.
1500 for Ethernet II
encapsulated packets
1492 for SNAP
encapsulated packets
ARP age
Locally overrides the global setting. Refer to
Table 86
.
Ten minutes
Directed
broadcast
forwarding
Locally overrides the global setting. Refer to
Table 86
.
Disabled
ICMP Router
Discovery
Protocol (IRDP)
Locally overrides the global IRDP settings. Refer to
Table 86
.
Disabled
ICMP Redirect
messages
Locally overrides the global setting. Refer to
Table 86
.
Enabled
DHCP gateway
stamp
The device 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 device 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 device can forward UDP broadcast packets for
UDP applications such as BootP. By forwarding the
UDP broadcasts, the device 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.
Refer to the next row.
The device 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 device to
forward requests for certain UDP applications from
a client on one subnet to a server on another
subnet.
None configured
TABLE 87
IP interface parameters (Continued)
Parameter
Description
Default