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Configuring IP, ARP, RARP, RIP, and OSPF Services
6-34
308627-14.00 Rev 00
Specifying the MTU Size
OSPF recognizes a maximum transmission unit (MTU) size for updates
transmitted on an interface. By default, when you configure OSPF on an interface,
OSPF uses the MTU size specified for the type of network to which the interface
is connected.
Using the BCC or Site Manager, you can configure OSPF to do the following:
Send packets no larger than the IP MTU size for Ethernet (1500).
Use the MTU size that you specify. The number you enter must be less than
the IP MTU size for that physical interface.
Using the BCC
To specify the MTU size, navigate to an OSPF interface prompt (for example,
box; eth 2/2; ip/2.2.2.2/255.255.0.0; ospf
) and enter:
mtu
<
size>
size
is 1, 2, or the MTU size in bytes.
For example, the following command sets the MTU to 2 on IP interface 2.2.2.2. A
value of 2 sends packets no larger than the IP MTU size for Ethernet (1500).
ospf/2.2.2.2#
mtu 2
ospf/2.2.2.2#
Note:
When running OSPF over a synchronous/PPP link, set the MTU size to
a value less than the synchronous MTU size (1200). This setting allows all
OSPF routes to be learned over the link.
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