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[Initial value]
ip forwarding disable
[Input mode]
global configuration mode
[Description]
Enables or disables forwarding of IPv4 packets.
If this is executed with the "no" syntax, the setting returns to the default.
7.4.2 Show IPv4 forwarding settings
[Syntax]
show ip forwarding
[Input mode]
unprivileged EXEC mode, priviledged EXEC mode
[Description]
Shows the IPv4 packet forwarding settings.
[Example]
Shows the IPv4 packet forwarding settings.
SWP2>show ip forwarding
IP forwarding is on
7.4.3 MTU setting
[Syntax]
mtu mtu
no mtu
[Parameter]
mtu : <68-9216>
Maximum packet size that can be transmitted
[Initial value]
mtu 1500
[Input mode]
interface mode
[Description]
Sets the maximum value (MTU) for the size of packets that can be transmitted from the VLAN interface.
Eligible packets are those which are transmitted from this product, as well as those which are L3 forwarded (routing). Ethernet
frames that are L2 forwarded by this product are not eligible.
When L3 forwarding packets for which the total length of the IPv4 header exceeds the MTU value, the packets are IP
fragmented and then transmitted.
When L3 forwarding packets for which the payload length of the IPv6 header exceeds the MTU value, an ICMPv6 error is sent
back and the packets are discarded.
Since packets that fit into the Ethernet frame length set by the mru command are eligible for routing, you must use the mru
command to adjust the length of Ethernet frames that can be received when routing jumbo frames.
If this command is executed with the "no" syntax, the setting returns to the default.
[Note]
This command can be specified only for VLAN interface.
You can specify up to seven different values for the MTU besides the default value.
On VLAN interfaces for which ipv6 enable has been specified, the MTU can be set within a range of <1280-9216>.
Y
ou cannot specify the ipv6 enable command for a VLAN interface that is set to an MTU value less than 1280.
Command Reference | Layer 3 functions | 235