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.

The Cisco cBR Series Remote PHY Digital Physical Interface Card (DPIC) provides the Ethernet network connection between the CCAP core and Remote PHY devices.

You can enable or disable RPHY link redundancy feature for a chassis. The redundancy state of a link is described using the link mode and role.

The redundancy mode is the term that is used for the configured or administered designation of a link, and is determined during the link configuration. The redundancy mode does not change during a switchover. There are two redundancy modes:

• Primary mode: This is the default working link of a core interface. The primary link is fixed to port 0, 2, 4, 6 when the link high availability is enabled.

• Secondary mode: This mode provides protection to the primary link. The secondary link is fixed to port 1, 3, 5, 7 when the link high availability is enabled.

The redundancy role is a dynamic entity that indicates the runtime or operational status of a port. The role changes only during a link switchover. The entity has two states:

• Active role: This link carries the RPHY data stream of the core interface. When the primary link is switched over to the secondary link, the secondary link becomes the active link of the core interface.

• Standby role: This link does not run any RPHY data traffic, but gets prepared to become active when the current active link has failed. According to the physical state of the standby link, the standby link can be further distinguished into a standby-hot link and standby-cold link. A standby-hot retains the link in the UP state. The 10-Gigabit Ethernet transceiver and TX power are enabled in this case, and the 10-Gigabit Ethernet port state is UP in the directly connected switch or router. The link of standby port is shut down, the TX power turned off and the 10-Gigabit Ethernet port state in the directly connected switch or router is down.

cBR supports both standby-hot and standby-cold redundancy modes.

In 1+1 core link redundancy configuration, the secondary link is the backup link for the primary link. At any given time, only one link (the active link) carries the RPHY control and data traffic for a core interface. The standby link provides protection for only one primary link. Current 8x10G DPIC has eight 10G ports on front panel and 4x10G XFI ports to Cylons-R 40G. Each 10G XFI port provides two core interfaces sharing the total 10G bandwidth. For an 8-port DPIC card, you can provide four 1+1 redundant groups.

When link high availability is enabled in the chassis, the secondary card supports link HA as do the other linecards. Each linecard makes its link switchover decisions that is independently based on the physical link state.

The link redundancy is disabled by default. You need to enable the link redundancy feature manually.

• To set the DPIC link in the UP state, use the cable rphy link redundancy hot command.

• To set the DPIC link in the standby-down state, use the cable rphy link redundancy cold command. For example:

  Router# cable rphy link redundancy cold
  
  RPHY Link HA: Cold mode enabled
  Core Interface  Port  Mode        Role      Status
  --------------  ----  ----------  --------  ------
  Te 2/1/0        0     Primary     Active    Up
  Te 2/1/0        1     Secondary   Standby   Ready
  Te 2/1/2        2     Primary     Active    Up
  Te 2/1/2        3     Secondary   Standby   Ready
  Te 2/1/4        4     Primary     Active    Up
  Te 2/1/4        5     Secondary   Standby   Ready
  Te 2/1/6        6     Primary     Active    Up
  Te 2/1/6        7     Secondary   Standby   Ready

• To disable the link redundancy, run the no cable rphy link redundancy command.

To verify the DPIC link redundancy, go through the following steps:

• To check the link redundancy of any of the DPIC slots, run the show redundancy digi-pic slot <0-9> command. See the following example:

  Router# show redundancy digi-pic slot 0:
  
  
  RPHY Link HA: Hot mode enabled
  Core Interface Port Mode          Role       Status
  -------------- ---- --------- ------- ---------------
  Te 0/1/0        0    Primary       Active      Up
  Te 0/1/0        1    Secondary     Standby     Up (“Ready” in standby-cold mode)
  Te 0/1/2        2    Primary       Active      Up
  Te 0/1/2        3    Secondary     Standby     Down
  Te 0/1/4        4    Primary       Standby     Up (“Ready” in standby-cold mode)
  Te 0/1/4        5    Secondary     Active      Up
  Te 0/1/6        6    Primary       Active      Down
  Te 0/1/6        7    Secondary     Standby     Down

• To view the DPIC history, use the show redundancy digi-pic history slot <0-9> command. See the following example:

  Router# show redundancy digi-pic history slot 2
  
  Jun 25 2018 14:41:14 - 2/1/0: Auto switchover from port:1 link:down to port:0 link up, success.
  Jun 25 2018 14:40:54 - 2/1/0: Auto switchover from port:0 link:down to port:1 link up, success.
  Jun 25 2018 14:39:20 - 2/1/0: Enable LINKHA success.
  Jun 25 2018 14:39:20 - 2/1/2: Enable LINKHA success.
  Jun 25 2018 14:39:20 - 2/1/4: Enable LINKHA success.
  Jun 25 2018 14:39:20 - 2/1/6: Enable LINKHA success.
  Jun 25 2018 14:38:56 - 2/1/0: Disable LINKHA success.
  Jun 25 2018 14:38:56 - 2/1/2: Disable LINKHA success.
  Jun 25 2018 14:38:56 - 2/1/4: Disable LINKHA success.
  Jun 25 2018 14:38:56 - 2/1/6: Disable LINKHA success.
  Jun 25 2018 14:37:20 - 2/1/0: Manual switchover from port:1 to port:0, success.
  Jun 25 2018 14:37:16 - 2/1/0: Manual switchover from port:0 to port:1, success.
  Jun 25 2018 14:36:31 - 2/1/0: Enable LINKHA success.
  Jun 25 2018 14:36:31 - 2/1/2: Enable LINKHA success.
  Jun 25 2018 14:36:31 - 2/1/4: Enable LINKHA success.
  Jun 25 2018 14:36:31 - 2/1/6: Enable LINKHA success.
  

• To check the link redundancy of the TenGigabitEthernet 0/1/4, use the show redundancy digi-pic interface TenGigabitEthernet 0/1/4 command. See the following example:

  Router# show redundancy digi-pic interface TenGigabitEthernet 0/1/4
  
  Link HA  	: Hot mode enabled
  HA State 	: In Failover
  Reason   	: Manual Switchover
  
  Port Mode      Role        Status
  ---- --------- ------- -----------
    4  Primary     Standby     Up (“Ready” in standby-cold mode)
    5  Secondary   Active      Up

  You can view the DPIC history of the TenGigabitEthernet using the show redundancy digi-pic history interface TenGigabitEthernet <0-9>/1/<0, 2, 4, 6> command. See the following example:

  Router# show redundancy digi-pic history interface TenGigabitEthernet 2/1/0
  
  Jun 25 2018 14:41:14 - 2/1/0: Auto switchover from port:1 link:down to port:0 link up, success.
  Jun 25 2018 14:40:54 - 2/1/0: Auto switchover from port:0 link:down to port:1 link up, success.
  Jun 25 2018 14:39:20 - 2/1/0: Enable LINKHA success.
  Jun 25 2018 14:38:56 - 2/1/0: Disable LINKHA success.
  Jun 25 2018 14:37:20 - 2/1/0: Manual switchover from port:1 to port:0, success.
  Jun 25 2018 14:37:16 - 2/1/0: Manual switchover from port:0 to port:1, success.
  Jun 25 2018 14:36:31 - 2/1/0: Enable LINKHA success.
  Jun 25 2018 14:36:02 - 2/1/0: Disable LINKHA success.
  Jun 22 2018 00:01:24 - 2/1/0: Enable LINKHA success.
  Jun 22 2018 00:00:12 - 2/1/0: Enable LINKHA success.
  Jun 22 2018 00:00:08 - 2/1/0: Disable LINKHA success.
  Jun 21 2018 23:59:21 - 2/1/0: Enable LINKHA success.
  Jun 21 2018 23:52:21 - 2/1/0: Enable LINKHA success.
  Jun 21 2018 23:50:21 - 2/1/0: Enable LINKHA success.
  Jun 21 2018 23:50:17 - 2/1/0: Disable LINKHA success.
  Jun 21 2018 23:43:30 - 2/1/0: Enable LINKHA success.
  Jun 21 2018 23:42:02 - 2/1/0: Enable LINKHA success.
  Jun 21 2018 23:41:53 - 2/1/0: Disable LINKHA success.
  Jun 21 2018 20:43:05 - 2/1/0: Enable LINKHA success.