Configuring Basic IPv4 IS-IS Functions

Creating an IPv4 IS-IS Process

To configure basic IPv4 IS-IS functions, first create an IPv4 IS-IS process and enable IPv4 IS-IS interfaces.

Configuring an IPv4 IS-IS Interface

IS-IS can send Hello packets through an interface to establish neighbor relationships and flood LSPs only after IS-IS is enabled on the interface.

(Optional) Configuring a Cost for IS-IS Interfaces (IPv4)

Configuring the IS-IS interface costs can control IS-IS route selection.

(Optional) Configuring IS-IS Attributes on Interfaces of Different Network Types (IPv4)

Different IS-IS attributes can be configured for different types of network interfaces.

(Optional) Enabling LSP Fragment Extension on an IS-IS Device (IPv4)

If the LSP capacity is insufficient, newly imported routes and new TLVs fail to be added to LSP fragments. In this case, you can use LSP fragment extension to increase the LSP capacity, restoring the LSP space. When the LSP space is restored, the system automatically attempts to re-add these routes and TLVs to LSP fragments.

(Optional) Enabling a Device to Encapsulate Only One Interface IP Address in IS-IS LSPs (IPv4)

To implement interworking between Huawei and non-Huawei devices, you need to enable the type-132 TLV in LSPs to carry the IP address of only one IS-IS interface on the Huawei device.

Verifying the Configuration

After configuring basic IPv4 IS-IS functions, check information about IS-IS neighbors, interfaces, and routes.