
Customizing IP Services
117356-A Rev. A 4-35
Enabling MTU Discovery on an Interface
A probe MTU is a request for the maximum transmission unit (MTU) size used on
all networks an IP datagram must traverse from source to destination.
By configuring IP to respond to probe MTUs on this interface, you eliminate
transit fragmentation and destination reassembly for datagrams destined for this
interface and, therefore, decrease network load.
The reply MTU and the probe MTU are options 11 and 12 in RFC 1063.
By default, IP does not respond to probe requests. You can use the BCC or Site
Manager to turn this feature on and off as required.
Using the BCC
Navigate to an IP interface-specific prompt and enter
mtu-discovery
state
state is
on
off (default)
For example, the following command causes IP to respond to Probe MTUs on
interface 2.2.2.2.
ip/2.2.2.2# mtu-discovery on
ip/2.2.2.2#
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