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If no global router ID is configured, the highest loopback interface IP address, if any, 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.
If the interface whose IP address is the router ID is removed or modified, a new router ID is selected.
Other events, (the interface goes down; after a physical interface address is selected as the router ID, an
IP address is configured for a loopback interface; a higher interface IP address is configured) will not
trigger a router ID re-selection.
Examples
# Configure a global router ID.
<Sysname> system-view
[Sysname] router id 1.1.1.1
router-id
Syntax
router-id router-id
undo router-id
View
BGP view
Default level
2: System level
Parameters
router-id: Router ID in IP address format.
Description
Use router-id to specify a router ID.
Use undo router-id to remove the router ID.
To run BGP protocol, a router must have a router ID (an unsigned 32-bit integer), the unique ID of the
router in the AS.
You can specify a router ID manually. Otherwise, the system selects the highest IP address among
loopback interface addresses as the router ID. If no loopback interface addresses are available, the
system selects the highest IP address among physical interface IP addresses as the router ID. Specify a
loopback interface address as the router ID to enhance network reliability.
If the interface whose IP address is selected as the router ID or the manual router ID is deleted, the system
selects a new router ID for the router.
Examples
# Specifies the Router ID as 10.18.4.221.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] router-id 10.18.4.221
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