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428 CHAPTER 29: CONFIGURING OSPF
The default value of the cost of sending a packet on the interface is calculated
automatically according to the interface baud rate as follows:
The default value is automatically calculated according to interface baud rate.
■ If the baud rate is less than 2000 bps, 2000 is taken, and the overhead value is
100000000/2000=50000.
■ If the baud rate is greater than 100000000 bps, 100000000 is taken, and the
overhead value is 100000000/100000000=1.
■ If the baud rate is between 2000 bps and 100000000bps, the overhead value
is the result of 100000000/interface rate.
Configuring a Peer for
the NBMA Interface
Special configuration is needed for the network of an NBMP interface. Since the
adjacent router cannot be found by broadcasting hello packets, the IP address of
the adjacent router should be specified manually for the interface, as well as
whether the adjacent router has a voting right. This is specified with the
ospf
peer ip-address [eligible]
command. To use the eligible attribute, this
adjacent router must have no voting right.
On X.25 and frame relay networks, you can configure a map to make the whole
network fully connected so there is a virtual circuit between any two routers ont
eh network and they are directly reachable. Then OSPF can process like a
broadcast network. The IP address of the adjacent router, and whether it has a
voting right, must be specified manually for the interface because the adjacent
router cannot be found dynamically by broadcasting hello packets.
Perform the following configurations in interface view.
By default, no peer of the NBMA interface is specified.
When you configure the peer of the NBMA interface, the following items are
necessary:
■ The configured hello timer and dead timer between neighbors must be
identical.
■ The configured link route type betwen neighbors must be identical.
■ The area number that neighbors belong to must be identical.
■ The authentication mode (simple text or MD5), authentication password, and
key-id of the area that neighbors belong to must be identical.
■ The configured stub attribute of the areas including the neighbors must be
consistent.
Configure sending packet cost ospf cost cost
Reset the sending packet cost undo ospf cost
Table 492 Configuring a Peer for the NBMA Interface
Operation Command
Configure a peer for NBMA interface ospf peer ip-address [eligible]
Cancel or delete a peer for NBMA interface undo ospf peer ip-address