R3303-HP 6600/HSR6600 Routers Layer 3 - IP Routing Configuration Guide

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BGP GR and nonstop routing (NSR) are used to ensure continuous routing upon a switchover from the
active MPU to the standby MPU. GR has been used earlier and is more mature. However, GR requires the
cooperation of neighboring devices to recover routing information. The new active MPU needs to learn
all routes after an active/standby switchover. This affects the convergence speed.
BGP NSR can overcome this problem. It backs up BGP neighbor and routing information from the active
MPU to the standby MPU when the device is starting or operating. After an active/standby switchover,
NSR can complete routing information recovery without requiring the cooperation of other devices.
IMPORTANT:
The NSR and GR features are mutually exclusive. Do not configure them at the same time.
To configure BGP NSR:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A
3. Enable BGP NSR.
non-stop-routing Disabled by default.
Enabling trap
After trap is enabled for BGP, BGP generates Level-4 traps to report important events. The generated
traps are sent to the information center of the device. The output rules of the traps (whether to output the
traps and the output direction) are determined according to the information center configuration. (For
information center configuration, see Network Management and Monitoring Configuration Guide.)
To enable trap:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enable trap for BGP.
snmp-agent trap enable bgp
Optional.
Enabled by default.
Enabling logging of session state changes
This task allows you to enable BGP to log session establishment and disconnection events. You can use
the display bgp ipv4 peer log-info command to view the log information.
To enable the logging of session state changes:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A