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