domain-id

Function

The domain-id command sets the ID for an OSPF domain.

The undo domain-id command restores the default setting.

By default, the domain ID is null.

Format

domain-id { null | { domain-idvalue | domain-idvalue_ipv4 } [ [ type { 0005 | 0105 | 0205 | 8005 } value domainTypeValue ] | secondary ] ^* }

undo domain-id [ { domain-idvalue | domain-idvalue_ipv4 } [ type { 0005 | 0105 | 0205 | 8005 } value domainTypeValue ] ]

Parameters

Parameter	Description	Value
null	Indicates that the OSPF domain ID is null.	-
domain-idvalue	Specifies the ID of an OSPF domain as an integer.	It is an integer, the value ranges from 0 to 4294967295. The value is converted to dotted decimal notation (with 256 as a carry) when the ID is displayed.
domain-idvalue_ipv4	Specifies the ID of an OSPF domain as an IP address.	It is in dotted decimal notation, it is displayed as entered.
type	Specifies the domain ID type.	-
0005	Specifies the type 0x0005.	-
0105	Specifies the type 0x0105.	-
0205	Specifies the type 0x0205.	-
8005	Specifies the type 0x8005.	-
value domainTypeValue	Specifies the value of the OSPF domain ID.	The value is a hexadecimal number ranging from 0 to FFFF, and the default value is 0.
secondary	Indicates the ID of a secondary domain.	-

Views

OSPF view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
ospf	write

Usage Guidelines

Usage Scenario

Domain IDs are used to identify domains.

If the local OSPF area and an OSPF area of a remote VPN attempt to exchange Type 3 LSAs, the two areas must be in the same OSPF domain. You can run the domain-id command to configure the same domain ID for the two OSPF areas.

The routes that are imported from a PE Router are advertised using External-LSAs. The routes destined for different nodes in the same OSPF domain are advertised based on Type-3 LSAs. This requires that the nodes in the same OSPF domain be configured with the same domain ID.

OSPF direct routes to a PE do not carry the domain ID, whereas BGP direct routes to a PE do.

If the undo domain-id command with no parameter specified is executed, the primary domain ID will be deleted.

Configuration Impact

Before sending routes to a remote CE Router, a PE Router sends Type-3 LSAs or Type-5 LSAs to the CE based on domain ID. If local domain IDs are the same as or compatible with remote domain IDs in BGP routes, the PE advertises Type 3 routes. If local domain IDs are different from or incompatible with remote domain IDs in BGP routes, the PE advertises Type 5 routes.

Precautions

Each OSPF domain has one or multiple domain IDs. One of them is a primary ID, and the others are secondary IDs.
If an OSPF instance does not have a specific domain ID, its ID is considered as null.
If the value of the domain ID is 0, secondary cannot be configured.
The maximum number of domain-id secondary items configured in an OSPF process is 1000.
The domain-id command cannot be run on a public network.

Example

# Set the VPN domain ID in OSPF VPN extension.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance vpn1
[*HUAWEI-vpn-instance-vpn1] ipv4-family
[*HUAWEI-vpn-instance-vpn1-af-ipv4] quit
[*HUAWEI-vpn-instance-vpn1] quit
[*HUAWEI] ospf 1 vpn-instance vpn1
[*HUAWEI-ospf-1] domain-id 234