These control how a 128T treats sessions when a peer path (a peering association from one router to another) gets interrupted.
When session-resiliency = none, a failed peer path takes down the sessions with it.
When session-resiliency = failover, a 128T will treat ensuing packets for that session as "first packets" in the event of a peer path failure, and re-trigger metadata generation to choose another path for the session.
When session-resiliency = revertible-failover, the 128T will behave as it does in "failover," but revert back to the original path if it is restored while the session is still in progress.
When session-resiliency = packet-duplication, the 128T sends two copies of each packet to its destination via separate peer paths. The recipient 128T drops any duplicates it receives. This can only be used with services that use UDP transport, and is typically used for RTP (voice) services to improve call quality when there are periods of loss/latency/jitter on one link.
We've also recently added two new session-resiliency modes: packet-retransmission and packet-retransmission-with-dpi. These are used as sort of a "SACK" (selective ACK) feature, where routers can re-request packets that are lost in transit between one another. Perhaps
@Michael Adams can talk about the difference between the regular and with-dpi variations...
------------------------------
pt.
------------------------------
Original Message:
Sent: 12-04-2018 15:29
From: Justin Melloni
Subject: What are the Session Resiliency settings?
In the Service Policy, there are 4 settings under Session Resiliency:
- none
- failover
- revertible-failover
- packet-duplication
What does each setting do?
------------------------------
Justin Melloni
Documentation/Training Specialist
MA
------------------------------