Table 268: Interface Configuration Fields (continued)
Field
Description
IP Address
The IP address of the interface. This field can be configured only when the
selected IP Address Configuration Method is Manual. If the method is DHCP, the
interface attempts to lease an IP address from a DHCP server on the network,
and the IP address appears in this field (read-only) after it is acquired. If this field
is blank, the IP Address Configuration Method might be None, or the method
might be DHCP and the interface is unable to lease an address.
Subnet Mask
The IP subnet mask for the interface (also known as the network mask or
netmask). This field can be configured only when the selected IP Address
Configuration Method is Manual.
MAC Address
The burned-in physical address of the interface. The format is six two-digit
hexadecimal numbers separated by colons, for example 00:06:29:32:81:40.
IP MTU
The largest IP packet size the interface can transmit, in bytes. The IP Maximum
Transmission Unit (MTU) is the maximum frame size minus the length of the
Layer 2 header.
Bandwidth
The configured bandwidth on this interface. This setting communicates the
speed of the interface to higher-level protocols.
Encapsulation Type
The link layer encapsulation type for packets transmitted from the interface,
which can be either Ethernet or SNAP.
Forward Net Directed
Broadcasts
Determines how the interface handles network-directed broadcast packets. A
network-directed broadcast is a broadcast directed to a specific subnet. If this
option is selected, network directed broadcasts are forwarded. If this option is
clear, network directed broadcasts are dropped.
Proxy ARP
When this option is selected, proxy ARP is enabled, and the interface can
respond to an ARP request for a host other than itself. An interface can act as an
ARP proxy if it is aware of the destination and can route packets to the intended
host, which is on a different subnet than the host that sent the ARP request.
Local Proxy ARP
When this option is selected, local proxy ARP is enabled, and the interface can
respond to an ARP request for a host other than itself. Unlike proxy ARP, local
proxy ARP allows the interface to respond to ARP requests for a host that is on
the same subnet as the host that sent the ARP request. This feature is useful
when a host is not permitted to reply to an ARP request from another host in the
same subnet, for example when using the protected ports feature.
Destination Unreachables
When this option is selected, the interface is allowed to send
Destination
Unreachable message to a host if the intended destination cannot be reached for
some reason. If this option is clear, the interface will not send ICMP Destination
Unreachable messages to inform the host about the error in reaching the
intended destination.
ICMP Redirects
When this option is selected, the interface is allowed to send ICMP Redirect
messages. The device sends an ICMP Redirect message on an interface only if
ICMP Redirects are enabled both globally and on the interface. An ICMP Redirect
message notifies a host when a better route to a particular destination is
available on the network segment.
Configuring Routing
ExtremeSwitching 200 Series: Administration Guide
263