Configuring The Network Type Of An Interface As P2P - 3Com S7906E Configuration Manual

Configure the IS level of all routers as Level-1 or Level-2 and don't configure different levels in this
case because there is no need for all routers to maintain two identical LSDBs;
Configure the IS level as Level-2 on all routers in an IP network for scalability.
For an interface of a Level-1 (or Level-2) router, the circuit level can only be Level-1 (or Level-2). For an
interface of a Level-1-2 router, the default circuit level is Level-1-2; if the router only needs to form
Level-1 (or Level-2) neighbor relationships, you can configure the circuit level for its interfaces as
Level-1 (or Level-2) to limit neighbor relationship establishment.
Follow these steps to configure the IS level and circuit level:
To do...
Enter system view
Enter IS-IS view
Specify the IS level
Return to system view
Enter interface view
Specify the circuit level

Configuring the Network Type of an Interface as P2P

Interfaces with different network types operate differently. For example, broadcast interfaces on a
network need to elect the DIS and flood CSNP packets to synchronize the LSDBs, while P2P interfaces
on a network need not elect the DIS and have a different LSDP synchronization mechanism.
If there are only two routers on a broadcast network, you can 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:
Enter system view
Enter interface view
Configure the network type for the
interface as P2P
Use the command...
system-view
isis [ process-id ]
[ vpn-instance
vpn-instance-name ]
is-level { level-1 | level-1-2 |
level-2 }
quit
interface interface-type
interface-number
isis circuit-level [ level-1 |
level-1-2 | level-2 ]
To do... Use the command...
system-view
interface interface-type
interface-number
isis circuit-type p2p
1-18
Remarks
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––
Optional
The default is Level-1-2.
––
––
Optional
The default is Level-1-2.
Remarks
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Optional
By default, the
network type of an
interface depends
on the physical
media. The network
type of a VLAN
interface is
broadcast.