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

Interchassis Session Recovery

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.
◦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
Configuring the Service Redundancy Protocol (SRP) Context
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