Digitus DN-80233, User Manual

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This command disables the forwarding of network-directed broadcasts. When disabled,
network directed broadcasts are dropped.
Format
no ip netdirbcast
Mode Interface Config
11.2.9 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 switch 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
duringdatabase exchange. If two OSPF neighbors advertise different IP MTUs, they will not form
anadjacency (unless OSPF has been instructed to ignore differences in IP MTU with the ip ospf
mtuignore command.)
Note:
The IP MTU size refers to the maximum size of the IP packet (IP 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 “mtu” on page 32.) must take into account the size of the Ethernet
header.
„
The minimum IP MTU is 68 bytes.
„
The maximum IP MTU is 1500 bytes.
Default 1500 bytes
Format ip mtu <mtu>
Mode Interface Config
11.2.9.1 no ip mtu
This command resets the ip mtu to the default value.
Format no ip mtu <mtu>
Mode Interface Config
11.2.10 show ip brief
This command displays all the summary information of the IP. This command takes no options.
Format
show ip brief
Modes Privileged EXEC User EXEC
Default Time to Live
The computed TTL (Time to Live) of forwarding a packet
from the local router to the final destination.