In Remote PHY (R-PHY) configuration, RPDs connect to both active linecard and standby linecard, and have active connections to active linecard, standby connections to standby linecard. From RPD side, it connects to active core and standby core independently.

Each RPD has one principal core, and may have several auxiliary cores. LCHA needs to support multiple cores. These cores are on the same linecard or different linecards. The port on the standby linecard can protect all the same ports on the active linecards.

In the figure above, the RPD has multiple cores connected to the same active linecard. In order to support LCHA, RPD needs to connect to the same port on the standby linecard. In this way, RPD has several standby cores to protect the active cores. The standby core have the same resource as the active core.

When multiple cores connect to different active linecards, if they connect to different ports of the linecard, there will have different standby cores. If active core connects to the same port on different linecard, they share one standby core.

In the figure above, RPD have two standby cores. One standby core connects to port 6 of the standby linecard, it can protect the active core which connects to port 6 of the active linecard 2. The other standby core connects to port 0 of the standby linecard, it can protect the active cores connect to port 0 of linecard 0 and linecard 1. So for the standby core 0, it contains the resource for both active core 0 and active core 1.

When active linecard 0 fails over to standby linecard, the standby core 1 will be deleted, the standby core 0 will bring the resource of active core 0 to active. When linecard 2 fails over to standby linecard, the standby core 0 will be deleted, and standby core 1 will become active for active core 3.

For more information about Line Card Redundancy, see Line Card Redundancy.

Compared to the SUP high availability recover process in iCMTS configuration, the Remote PHY SUP high availability recover process has RPD status change as shown in the example below:

show cable rpd 0004.9f00.0625 lcha-cores 
MAC Address     IP Address    I/F        State         Role  HA   Name 
0004.9f00.0625  120.105.6.10  Te0/1/1    recovering    Pri   Act  node1 
0004.9f00.0625  120.105.6.10  Te9/1/1    recovering    NA    Sby  node1 

show cable rpd 0004.9f00.0625 lcha-cores 
MAC Address     IP Address    I/F        State         Role  HA   Name 
0004.9f00.0625  120.105.6.10  Te0/1/1    init(l2tp)    Pri   Act  node1 
0004.9f00.0625  120.105.6.10  Te9/1/1    init(l2tp)    NA    Sby  node1 

show cable rpd 0004.9f00.0625 lcha-cores 
MAC Address     IP Address    I/F        State         Role  HA   Name 
0004.9f00.0625  120.105.6.10  Te0/1/1    online        Pri   Act  node1 
0004.9f00.0625  120.105.6.10  Te9/1/1    online        NA    Sby  node1 

The status of the RPD changes from recovering to online, indicating that the SUP redundancy is working in the Remote PHY configuration.

For more information about SUP redundancy, see Supervisor Redundancy.