H3C Technologies H3C SR8800 - Manual (Page 252)

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NOTE:
•
In general, the maximum time allowed for the peer (the GR restarter) to reestablish a BGP session should
be less than the Holdtime carried in the Open message.
• The End-Of-RIB (End of Routing-Information-Base) indicates the end of route updates.
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 router. 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:
Step 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 peer state changes
To enable the logging of peer state changes:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter BGP view. bgp as-number N/A
3. Enable the logging of peer
state changes globally.
log-peer-change
Optional
Enabled by default
4. Enable the logging of peer
state changes for a peer or
peer group.
peer { group-name | ip-address }
log-change Optional
Enabled by default
Configuring BFD for BGP
BGP maintains neighbor relationships based on the keepalive timer and holdtime timer, which are set in
seconds. BGP defines that the holdtime interval must be at least three times the keepalive interval. This
mechanism makes link failure detection rather slow; once a failure occurs on a high-speed link, a large
quantity of packets will be dropped. BFD is introduced to solve this problem. It detects links between
neighbors quickly to reduce convergence time upon link failures.
To enable BFD for a BGP peer:
Step Command Remarks
1. Enter system view. system-view
N/A