Router Id - HP 5920 Series Command Reference Manual

1. Selects the route with the highest preference:
If RFC 2328 is compatible with RFC 1583, all these routes have equal preference.
If RFC 2328 is not compatible with RFC 1583, the intra-area route in a non-backbone area is
preferred to reduce the burden of the backbone area. The inter-area route and intra-area route
in the backbone area have equal preference.
2. Selects the route with lower cost if two routes have equal preference.
3. Selects the route with larger originating area ID if two routes have equal cost.
To avoid routing loops, HP recommends setting identical RFC 1583-compatibility on all routers in a
routing domain.
Examples
# Disable compatibility with RFC 1583.
<Sysname> system-view
[Sysname] ospf 100
[Sysname-ospf-100] undo rfc1583 compatible

router id

Use router id to configure a global router ID.
Use undo router id to restore the default.
Syntax
router id router-id
undo router id
Default
No global router ID is configured.
Views
System view
Predefined user roles
network-admin
Parameters
router-id: Specifies the router ID, in the format of an IPv4 address.
Usage guidelines
OSPF uses a router ID to identify a device. If no router ID is specified, the global router ID is used.
If no global router ID is configured, the highest loopback interface IP address is used as the router ID. If
no loopback interface IP address is available, the highest physical interface IP address is used,
regardless of the interface status (up or down).
During an active/standby switchover, the new active main processing unit (MPU) checks whether the
previously backed up router ID is valid. If not, it selects a new router ID.
A new router ID is selected only when the interface IP address used as the router ID is removed or
changed. Other events will not trigger a router ID re-selection. For example, router ID re-selection is not
triggered when the interface goes down, you change the router ID to the address of a loopback interface
174