Huawei Quidway S6500 Series Operation Manual page 176

Operation Manual - Routing Protocol
Quidway S6500 Series Ethernet Switches
Configure the interface type to p2mp if not all the routers are directly accessible on an
NBMA network.
Change the interface type to p2p if the router has only one peer on the NBMA network.
The differences between NBMA and p2mp are listed below:
In OSPF, NBMA refers to the networks that are fully connected, non-broadcast and
multi-accessible. However, p2mp network is not required to be fully connected.
DR and BDR are required on a NBMA network but not on p2mp network.
NBMA is the default network type. For example, if ATM is adopted as the link layer
protocol, OSPF defaults the network type on the interface to NBMA, regardless of
whether the network is fully connected. P2mp is not the default network type. No
link layer protocols will be regarded as p2mp. You must change the network type
to p2mp by force. The commonest undertaking is to change a partially connected
NBMA network to a p2mp network.
NBMA forwards packets by unicast and requires to configure neighbors manually.
P2mp forward packets by multicast.
Perform the following configuration in Interface view:
Table 4-5 Configuring a Network Type on the Interface That Starts OSPF Protocol
Configure network type on the interface
After the interface has been configured with a new network type, the original network
type of the interface is removed automatically.
4.2.6 Configuring the Cost for Sending Packets on an Interface
The user can control the network traffic by configuring different message sending costs
for different interfaces. Otherwise, OSPF will automatically calculate the cost according
to the baud rate on the current interface.
Perform the following configuration in Interface view:
Table 4-6 Configuring the cost for sending packets on Interface
Configure the cost for sending packets
on Interface
Restore the default cost for packet
transmission on the Interface
Operation
Operation
Huawei Technologies Proprietary
4-8
Chapter 4 OSPF Configuration
Command
ospf network-type { broadcast | nbma
| p2mp | p2p }
Command
ospf cost value
undo ospf cost