Kontron AT8904 CLI - Manual (Page 124)

Routing Commands AT8904M
AT8904M CLI Reference Manual Page 3 - 10
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 + 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 (2.1.5 “mtu” on page 2 - 3) must take into account the
size of the Ethernet header.
Default 1500 bytes
Format
ip mtu
<68-1500>
Mode Interface Config
3.2.9.1 no ip mtu
This command resets the ip mtu to the default value.
Format
no ip mtu
Mode Interface Config
3.2.10 encapsulation
This command configures the link layer encapsulation type for the packet. The
encapsulation type can be
ethernet
or
snap
.
Default ethernet
Format
encapsulation
{ethernet | snap}
Mode Interface Config
NOTE: Routed frames are always ethernet encapsulated when a frame is
routed to a VLAN.
3.2.11 show ip brief
This command displays all the summary information of the IP.
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.
Routing Mode Shows whether the routing mode is enabled or disabled.
IP Forwarding Mode Shows whether forwarding of IP frames is enabled or dis-
abled. This is a configured value.
Maximum Next Hops The maximum number of next hops the packet can travel.