Cisco routers will send a trap on BGP peering changes. The following is
an example config:
snmp-server community private RW 1
snmp-server community public RO 2
snmp-server trap-authentication
snmp-server enable traps envmon
snmp-server enable traps bgp
snmp-server enable traps frame-relay
snmp-server host XXX.XXX.XXX.XXX public tty frame-relay isdn
envmon bgp snmp
You must enable traps for BGP events and then define the SNMP console
"host" to receive those traps and list the traps you want sent to that
host.
Hope this helps,
Chad