Dscp Marking Of Srp Messages; Optimizing Switchover Transitions - Cisco ASR 5500 Administration Manual

Configuring the Service Redundancy Protocol (SRP) Context

DSCP Marking of SRP Messages

You can enable separate DSCP marking of SRP control and checkpoint messages. The dscp-marking command
sets DSCP marking values for SRP control and checkpoint (session maintenance) messages.
configure
context context_name
service-redundancy-protocol
dscp-marking { control | session } dscp_value
Notes:
• dscp_value can be:

Optimizing Switchover Transitions

There are several SRP configuration options that reduce the transition time from the active to standby gateways
(primarily P-GW) in support of VoLTE traffic.
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◦af11 – Assured Forwarding Class 1 low drop PHB (Per Hop Behavior)
◦af12 – Assured Forwarding Class 1 medium drop PHB
◦af13 – Assured Forwarding Class 1 high drop PHB
◦af21 – Assured Forwarding Class 2 low drop PHB
◦af22 – Assured Forwarding Class 2 medium drop PHB
◦af23 – Assured Forwarding Class 2 high drop PHB
◦af31 – Assured Forwarding Class 3 low drop PHB
◦af32 – Assured Forwarding Class 3 medium drop PHB
◦af33 – Assured Forwarding Class 3 high drop PHB
◦af41 – Assured Forwarding Class 4 low drop PHB
◦af42 – Assured Forwarding Class 4 medium drop PHB
◦af43 – Assured Forwarding Class 4 high drop PHB
◦be – Best effort Per-Hop-Behaviour (default)
◦cs1 – Class selector 1 PHB
◦cs2 – Class selector 2 PHB
◦cs3 – Class selector 3 PHB
◦cs4 – Class selector 4 PHB
◦cs5 – Class selector 5 PHB
◦cs6 – Class selector 6 PHB
◦cs7 – Class selector 7 PHB
◦ef – Expedited Forwarding PHB, for low latency traffic
Interchassis Session Recovery