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 of interface.

By default, the network type of the interface is determined by the type of physical interface. The network type of Ethernet interface is broadcast, that of the serial interface is p2p, and Frame-relay interface is nbma.

Format

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

undo isis circuit-type

Parameters

Parameter	Description	Value
p2p	Sets the interface network type as P2P.	-
strict-snpa-check	Enables IS-IS to check the SNPA address of each received LSP or SNP.	-

Views

Ethernet interface view, Ethernet sub-interface view, Eth-Trunk interface view, Eth-Trunk sub-interface view, Tunnel interface view, Loopback interface view, Dialer interface view, VLANIF interface view, Virtual-Template interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

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

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

Prerequisites

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

Configuration Impact

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

After a broadcast interface is emulated as a P2P interface through the isis circuit-type command, the interval for sending Hello packets, the number of Hello packets that IS-IS does not receive from a neighbor before the neighbor is declared Down, interval for resending LSP packets on a P2P link, and various IS-IS authentication modes are restored to the default settings; other configurations such as the DIS priority, DIS name, and interval for sending CSNP packets on a broadcast network become invalid.
After the undo isis circuit-type command is run to restore the broadcast network, the interval for sending Hello packets, the number of Hello packets that IS-IS does not receive from a neighbor before the neighbor is declared Down, interval for resending LSP packets on a P2P link, various IS-IS authentication modes, DIS priority, and interval for sending CSNP packets 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.

After a broadcast interface is configured as a P2P interface using the isis circuit-type p2p command, the default settings are restored for the interval for sending Hello packets, the number of Hello packets that IS-IS fails to receive from a neighbor before the neighbor is declared Down, interval for retransmitting LSPs on a P2P link, and various IS-IS authentication modes. Consequently, other configurations such as the DIS priority, DIS name, and interval for sending CSNPs on a broadcast network become invalid.
After the undo isis circuit-type command is run to restore the network type, the default settings are restored for the interval for sending Hello packets, the number of Hello packets that IS-IS fails to receive from a neighbor before the neighbor is declared Down, interval for retransmitting LSPs on a P2P link, various IS-IS authentication modes, DIS priority, and interval for sending CSNPs on a broadcast network.

Example

# Set the network type of GigabitEthernet0/0/0 as P2P.

<sysname> system-view

[sysname] interface GigabitEthernet 0/0/0
[sysname-GigabitEthernet0/0/0] isis enable
[sysname-GigabitEthernet0/0/0] isis circuit-type p2p