isis circuit-type

Function

The isis circuit-type command sets the network type of an interface to emulate a P2P interface.

The undo isis circuit-type command restores the default network type.

By default, the interfaces' network type is broadcast.

Format

isis circuit-type p2p [ strict-snpa-check ]

isis process-id process-id circuit-type p2p [ strict-snpa-check ]

undo isis circuit-type

undo isis process-id process-id circuit-type

Parameters

Parameter	Description	Value
strict-snpa-check	Enables IS-IS to check the SNPA address of each received LSP or SNP.	-
process-id process-id	Specifies the IID of an IS-IS multi-instance process.	The value is an integer ranging from 1 to 4294967295.
p2p	Sets the interface network type as P2P.	-

Parameter

Description

Value

strict-snpa-check

Enables IS-IS to check the SNPA address of each received LSP or SNP.

process-id process-id

Specifies the IID of an IS-IS multi-instance process.

The value is an integer ranging from 1 to 4294967295.

p2p

Sets the interface network type as P2P.

Views

100GE interface view, 10GE interface view, 25GE sub-interface view, 25GE interface view, 400GE interface view, 40GE interface view, 50GE sub-interface view, 50GE interface view, Eth-Trunk interface view, FlexE interface view, GE optical interface view, GE electrical interface view, GMPLS-UNI interface view, Global VE sub-interface view, Loopback interface view, Tunnel interface view, VBDIF interface view, VE sub-interface view, VE interface view, VLANIF interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
isis	write

Usage Guidelines

Usage Scenario

The network type of IS-IS interfaces at the ends of a link must be the same. Otherwise, the two interfaces cannot set up a neighbor relationship.

The isis circuit-type command sets the network type of an interface to emulate a P2P interface so that the IS-IS interfaces at the ends of the link have the same network type and a neighbor relationship can be established between them.

When an IS-IS neighbor relationship is established between a P2P interface and a simulated P2P interface and the simulated P2P interface has direct neighbors, the P2P interface may receive unneeded packets from these direct neighbors. To prevent the P2P interface from accepting these unneeded packets, specify strict-snpa-check in the isis circuit-type command to enable IS-IS to check the SNPA address of each received LSP or SNP. After the command is run, the P2P interface accepts only the packets whose SNPA addresses are included in the local neighbor address list, which improves network security.

Prerequisites

IS-IS has been enabled on interfaces using the isis enable command.

Configuration Impact

For an IS-IS interface, when the network type of the interface changes, corresponding configurations change accordingly. Details are as follows:

After a broadcast interface is emulated as a P2P interface using the isis circuit-type command, the interval at which Hello packets are sent, the number of Hello packets that IS-IS does not receive from a neighbor before the neighbor is declared Down, interval at which LSPs are retransmitted on a P2P link, and the IS-IS authentication mode are restored to the default settings; other configurations such as the DIS priority, DIS name, and the interval at which CSNPs are sent on a broadcast network become invalid.
After the undo isis circuit-type command is run to restore the network type of the interface, the interval at which Hello packets are sent, the number of Hello packets that IS-IS does not receive from a neighbor before the neighbor is declared Down, interval at which LSPs are retransmitted on a P2P link, the IS-IS authentication mode, DIS priority, and the interval at which CSNPs are sent on a broadcast network are restored to the default settings.

Precautions

If the network type of an interface is changed, some parameters of the IS-IS process are restored to the default settings. Exercise caution before running the command.

This command is applicable only to broadcast interfaces. If it is run on a P2P or P2MP interface, it does not take effect, and its configuration is not recorded in the configuration file.

Example

# Set the network type of Gigabit Ethernet 0/1/0 as P2P.

<HUAWEI> system-view
[~HUAWEI] isis 1
[*HUAWEI-isis-1] quit
[*HUAWEI] interface GigabitEthernet 0/1/0
[*HUAWEI-GigabitEthernet0/1/0] isis enable
[*HUAWEI-GigabitEthernet0/1/0] isis circuit-type p2p