H3C S7500E Series Command Manual page 654

Command Manual – IPv6 Routing
H3C S7500E Series Ethernet Switches
the highest IPv4 address of Loopback interfaces' addresses, then the highest IPv4
address of physical interfaces' addresses if no Loopback interfaces are configured.
Only when the interface with the router ID is removed or the manually configured router
ID is removed, will the system select another Router ID. To improve network reliability, it
is recommended to configure the IPv4 address of a loopback interface as the router ID.
Examples
# Specify the router ID of the router as 10.18.4.221.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] router-id 10.18.4.221
5.1.65 synchronization
Syntax
synchronization
undo synchronization
View
IPv6 address family view
Parameters
None
Description
Use the synchronization command to enable the synchronization between IPv6 BGP
and IGP.
Use the undo synchronization command to disable the synchronization.
The feature is disabled by default.
With this feature enabled and when a non-BGP router is responsible for forwarding
packets in an AS, IPv6 BGP speakers in the AS cannot advertise routing information to
other ASs unless all routers in the AS know the latest routing information.
By default, upon receiving an IPv6 IBGP route, the BGP router only checks whether the
next hop is reachable before advertisement. If synchronization is enabled, the IBGP
route can be advertised to EBGP peers only when the route is also advertised by the
IGP.
Examples
# Enable the route synchronization between IPv6 BGP and IGP.
<Sysname> system-view
Chapter 5 IPv6 BGP Configuration Commands
5-54