1012 CHAPTER 72: BGP CONFIGURATION COMMANDS

[Sysname-bgp] ipv4-family vpn-instance vpn1

[Sysname-bgp-vpn1] summary automatic

synchronization (BGP view)

Syntax synchronization

undo synchronization

View BGP view

Parameters None

Description Use the synchronization command to enable the synchronization between the BGP and IGP routes.

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, BGP speakers in the AS cannot advertise routing information to other ASs unless all routers in the AS know the latest routing information.

When a BGP router receives an IBGP route, it checks only whether the next hop is reachable by default. If the synchronization is enabled, the IBGP route is synchronized and advertised to EBGP peers only when the route is also advertised by IGP. Otherwise, the IBGP route cannot be advertised to EBGP peers.

Examples # Enable the synchronization between BGP and IGP routes.

<Sysname> system-view

[Sysname] bgp 100

[Sysname-bgp] synchronization

timer (BGP/BGP-VPN instance view)

Syntax timer keepalive keepalive hold holdtime

undo timer

View BGP view/BGP-VPN instance view

Parameters keepalive: Keepalive interval in seconds, ranging from 1 to 21845.

holdtime: Holdtime interval in seconds, ranging from 3 to 65535.

Description Use the timer command to configure BGP keepalive interval and holdtime interval.

Page 1012
Image 1012
3Com MSR 30, MSR 50 Synchronization BGP view, Timer BGP/BGP-VPN instance view, Syntax synchronization Undo synchronization