Quick Reference Guide

Routing Commands | 399
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.
Syntax
[no] ip mtu mtu
The no version of this command resets the IP MTU to the default value.
The mtu range is 68 bytes to 1500 bytes.
Default
1500 bytes
Mode
Interface Config or Interface VLAN
Command
History
ip netdirbcast
This command enables the forwarding of network-directed broadcasts. When enabled, network
directed broadcasts are forwarded. When disabled, they are dropped.
Syntax
[no] ip netdirbcast
The no version of this command disables the forwarding of network-directed broadcasts.
Default
disabled
Mode
Interface Config or Interface VLAN
Command
History
ip route
This command configures a static route. The ip_addr is a valid ip address. The subnet_mask is a
valid subnet mask. The nextHopRtr is a valid IP address of the next hop router. The preference is an
integer value from 1 to 255.
The no version of this command deletes all next hops to a destination static route. If the optional
nextHopRtr parameter is designated, the next hop is deleted and if the optional preference value is
designated, the preference value of the static route is reset to its default.
Syntax
ip route ip_addr subnet_mask nextHopRtr [preference]
no ip route ip_addr subnet_mask [{nextHopRtr | preference}]
Default
preference - 1
Version 2.3
Modified: Added Interface VLAN
as a mode.
Version 2.3
Modified: Added Interface VLAN
as a mode.