Cisco Cisco Packet Data Interworking Function (PDIF)
Reverse Route Injection
HSRP ▀
SecGW Administration Guide, StarOS Release 18 ▄
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HSRP
Overview
Hot Standby Router Protocol (HSRP) is a Cisco proprietary redundancy protocol for establishing a fault-tolerant default
gateway (RFC 2281). The protocol establishes a framework between network routers in order to achieve default
gateway failover if the primary gateway becomes inaccessible.
gateway (RFC 2281). The protocol establishes a framework between network routers in order to achieve default
gateway failover if the primary gateway becomes inaccessible.
Chassis-to-chassis redundancy employs HSRP to detect failure in the system and notify other elements of the need to
change their HA State. Each VSM receives these notifications via oneP (Connected Apps) communication.
change their HA State. Each VSM receives these notifications via oneP (Connected Apps) communication.
An external HSRP-aware entity switches traffic from the primary to the backup chassis. All application instances must
failover to the backup chassis.
failover to the backup chassis.
For additional information on HSRP, see the ASR 9000 Series Aggregation Services Router IP Addresses and Services
Configuration Guide.
Configuration Guide.
Figure 13. HSRP Notification
Each StarOS VM requires a separate oneP connection to the RSP (four oneP connections per VSM).
Each StarOS VM is monitored by a separate HSRP link that is established using sub-interfaces.