Deriving The Router Id - Alcatel-Lucent 7450 Configuration Manual

Deriving the Router ID

Deriving the Router ID
The router ID defaults to the address specified in the system interface command. If the system
interface is not configured with an IP address, then the router ID inherits the last four bytes of the
MAC address. The router ID can also be manually configured in the
context. On the BGP protocol level, a BGP router ID can be defined in the
id
config>router>bgp router-id
Note that if a new router ID is configured, protocols are not automatically restarted with the new
router ID. The next time a protocol is initialized the new router ID is used. An interim period of
time can occur when different protocols use different router IDs. To force the new router ID, issue
the
shutdown
the entire router.
It is possible to configure an SR OS node to operate with an IPv6 only BOF and no IPv4 system
interface address. When configured in this manner, the operator must explicitly define IPv4 router
IDs for protocols such as OSPF and BGP as there is no mechanism to derive the router ID from an
IPv6 system interface address.
Use the following CLI syntax to configure the router ID:
CLI Syntax: config>router
The following example displays a router ID configuration:
A:ALA-4>config>router# info
#------------------------------------------
# IP Configuration
#------------------------------------------
. . .
#------------------------------------------
A:ALA-4>config>router#
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and
no shutdown
router-id router-id
interface ip-int-name
address {ip-address/mask | ip-address netmask} [broad-
cast all-ones | host-ones]
interface "system"
address 10.10.0.4/32
exit
router-id 10.10.0.4
context and is only used within BGP.
commands for each protocol that uses the router ID, or restart
7450 ESS Router Configuration Guide
config>router router-