
Configuring IP, ARP, RARP, RIP, and OSPF Services
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Enabling MTU Discovery on an Interface
An MTU probe is a request for the maximum transmission unit (MTU) size used
on all networks that an IP datagram must traverse from source to destination.
By configuring IP to respond to MTU probes on this interface, you eliminate
transit fragmentation and destination reassembly for datagrams destined for this
interface and, therefore, decrease network load.
The MTU reply and the MTU probe are options 11 and 12 in RFC 1063.
By default, IP does not respond to MTU probe requests. You can use the BCC or
Site Manager to turn this feature on and off as required.
Using the BCC
To enable or disable MTU discovery on an interface, go to an IP interface prompt
(for example,
box; eth 2/2; ip/2.2.2.2/255.255.0.0
) and enter:
mtu-discovery
<state>
state
is one of the following:
enabled
disabled
(default)
For example, the following command causes IP to respond to MTU probes on
interface 2.2.2.2:
ip/2.2.2.2/255.255.0.0#
mtu-discovery enabled
ip/2.2.2.2/255.255.0.0#
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