
Customizing OSPF Services
308627-14.20 Rev 00
6-37
Specifying the MTU Mismatch Detect
You can configure the action that the router takes if it finds a packet larger than the
configured MTU size. The
mtu-mismatch-detect
parameter controls the
interpretation of the MTU field in the database description packet header, based
on the specifications contained in RFC 2178.
According to RFC 2178, the MTU indicates the largest size IP packet that an
OSPF interface can receive. If the MTU of a packet is greater than the specified
maximum size, the packet is ignored, and an adjacency is not formed. In
RFC 1583, this field does not exist.
With the
mtu-mismatch-detect
parameter enabled (default), the router checks the
MTU size and proceeds according to RFC 2178. If you disable this parameter, the
router does not check the MTU size and proceeds according to RFC 1583.
Using the BCC
To specify whether to check the MTU size for incoming packets, go to an OSPF
interface prompt (for example,
box; eth 2/2; ip/2.2.2.2/255.255.0.0; ospf
) and
enter:
mtu-mismatch-detect
<state>
state
is one of the following:
enabled
(default)
disabled
3. Choose OSPF/MOSPF. The OSPF/MOSPF menu opens.
4. Choose Interfaces. The OSPF Interfaces window opens.
5. Click on the OSPF interface that you want
to edit.
The parameter values for that interface
appear in the OSPF Interfaces window.
6. Set the MTU Size parameter. Click on
Help or see the parameter description on
page A-46.
7. Click on Apply, and then click on Done. You return to the Configuration Manager
window.
Site Manager Procedure
(continued)
You do this System responds
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