Ip Netdirbcast; Ip Mtu - NETGEAR ProSafe FSM7326P Cli Reference Manual

Command Line Interface Reference for the ProSafe 7300S Series Layer-3 Stackable Switches,

14.2.8 ip netdirbcast

This command enables the forwarding of network-directed broadcasts. When enabled,
network directed broadcasts are forwarded. When disabled they are dropped.
Default
Format
Mode
14.2.8.1 no ip netdirbcast
This command disables the forwarding of network-directed broadcasts. When disabled,
network directed broadcasts are dropped.
Format
Mode

14.2.9 ip mtu

This command sets the IP Maximum Transmission Unit (MTU) on a routing interface.
The IP MTU is the size of the largest IP packet that can be transmitted on the interface
without fragmentation. The 7300S Series Stackable Switch software currently does not
fragment IP packets.
• Packets forwarded in hardware ignore the IP MTU.
• Packets forwarded in software are dropped if they exceed the IP MTU of the outgoing
interface.
Packets originated on the router, such as OSPF packets, may be fragmented by the IP
stack. The IP stack uses its default IP MTU and ignores the value set using the ip mtu
command.
OSPF advertises the IP MTU in the Database Description packets it sends to its neighbors
during database exchange. If two OSPF neighbors advertise different IP MTUs, they will
not form an adjacency (unless OSPF has been instructed to ignore differences in IP MTU
with the ip ospf mtu-ignore command.)
Note: The IP MTU size refers to the maximum size of the IP packet (IP Header +
Routing Commands
disabled
ip netdirbcast
Interface Config
no ip netdirbcast
Interface Config
IP payload). It does not include any extra bytes that may be required for
Layer-2 headers. To receive and process packets, the Ethernet MTU (See
Section 4.1.5 "mtu" on page
Ethernet header.
v1.0, March 2006
4-3) must take into account the size of the
14-11