MSDP Source Active Msgs
• Initial SA message sent when source first registers
• May optionally encapsulate first data packet
• Subsequent SA messages periodically refreshed every
60 seconds as long as source still active by originating
RP
• Other MSDP peers don’t originate this SA but only
forward it if received
• SA messages cached on router for new group members
that may join
• Reduced join latency
• Prevent SA storm propagation