H3C Technologies H3C S10500 Series Switches - Manual (Page 165)

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Configuring the network type of an interface as P2P
Interfaces with different network types operate differently. For example, broadcast interfaces on a
network must elect the DIS and flood CSNP packets to synchronize the LSDBs, but P2P interfaces on a
network do not need to elect the DIS, and have a different LSDB synchronization mechanism.
If only two routers exist on a broadcast network, configure the network type of attached interfaces as P2P
to avoid DIS election and CSNP flooding, saving network bandwidth and speeding up network
convergence.
Follow these steps to configure the network type of an interface:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Configure the network type for the interface
as P2P
isis circuit-type p2p
Optional
By default, the
network type of an
interface depends on
the physical media.
The network type of a
VLAN interface is
broadcast.
NOTE:
You can only perform this configuration for a broadcast network with only two attached routers.
Configuring IS-IS routing information control
Configuration prerequisites
Before configuring IS-IS routing information control, complete the following tasks:
• Configure network layer addresses for interfaces, and ensure adjacent nodes are reachable to
each other at the network layer.
• Enable IS-IS
Configuring IS-IS link cost
The IS-IS cost of an interface is determined in the following order:
• IS-IS cost specified in interface view
• IS-IS cost specified in system view. The cost is applied to the interfaces associated with the IS-IS
process.
• Automatically calculated cost—When the cost style is wide or wide-compatible, IS-IS automatically
calculates the cost using the formula: interface cost = (bandwidth reference value/interface
bandwidth) ×10. When the cost style is of another type: if the interface bandwidth does not exceed
10 Mbps, the interface cost equals 60; if the interface bandwidth does not exceed 100 Mbps, the
interface cost equals 50; if the interface bandwidth does not exceed 155 Mbps, the interface cost