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:
◦ 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
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.
ASR 5500 System Administration Guide, StarOS Release 21.5
275
Interchassis Session Recovery
Configuring the Service Redundancy Protocol (SRP) Context
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