Supported Platforms
Preservation of CoS Shaping Across ANCP Restarts
When the ANCP agent stops due to a process or GRES, CoS enforces the ANCP downstream shaping-rates until the CoS keepalive timer expires. When the timer expires, CoS reverts to the CoS shaping-rate configured for the interfaces.
You configure the CoS keepalive timer by including the maximum-helper-restart-time seconds statement at the [edit protocols ancp] hierarchy level. It specifies how much time other daemons such as CoS wait for ANCP to restart and is used to configure the CoS rate update keepalive timer.
The ANCP agent does not maintain TCP sessions from neighbors across the restart or GRES. When it restarts, it must re-establish sessions with neighbors and subscriber sessions before the timer expires. For all the re-established sessions, the ANCP agent updates CoS with the updated downstream shaping rates and provides DSL line attributes to the session database for AAA.
If CoS stops or restarts while ANCP is up, the ANCP agent retransmits all known subscriber downstream rates to CoS. Any existing adjusted shaping rates that have not been updated revert to the configured CoS shaping rates when the CoS restart timer expires.
