Media Interface Link Detection and Gateway Polling

You can use media interface link detection and gateway polling globally on the Oracle® Enterprise Session Border Controller, or you can override those global parameters on a per-network-interface basis.

Use the Oracle® Enterprise Session Border Controller HA node (redundancy) configuration to establish global parameters. When configured globally, they will appear like this in the ACLI:
```
gateway-heartbeat-interval     0
gateway-heartbeat-retry        0
gateway-heartbeat-timeout      1
gateway-heartbeat-health       0
```

Use the network interface’s gateway heartbeat configuration to override global parameters on a per-network-interface basis. When configured for the network interface, these parameters will appear like this in the ACLI:

gw-heartbeat
                state                          enabled
                heartbeat                      0
                retry-count                    0
                retry-timeout                  1
                health-score                   0

Media Interface Link Detection and Gateway Polling Configuration

To configure global media interface link detection and gateway polling:

In Superuser mode, type configure terminal and press Enter.
```
ORACLE# configure terminal
```
Type system and press Enter to access the system-level configuration elements.
```
ORACLE(configure)# system
```
Type redundancy and press Enter.
```
ORACLE(system)# redundancy
```
From here, you can configure gateway heartbeat parameters. To view all gateway heartbeat parameters, enter a ? at the system prompt.
gateway-heartbeat-interval—Enter the number of seconds between heartbeats for the media interface gateway. Heartbeats are sent at this interval as long as the media interface is viable. The default value is 0. The valid range is:
- Minimum—0
- Maximum—65535
gateway-heartbeat-retry—Enter the number of heartbeat retries (subsequent ARP requests) to send to the media interface gateway before it is considered unreachable. The default value is 0. The valid range is:
- Minimum—0
- Maximum—65535
gateway-heartbeat-timeout—Enter the heartbeat retry time-out value in seconds. The default value is 1. The valid range is:
- Minimum—0
- Maximum—65535
  
  This parameter sets the amount of time between Oracle® Enterprise Session Border Controller ARP requests to establish media interface gateway communication after a media interface gateway failure.
gateway-heartbeat-health—Enter the amount to subtract from the Oracle® Enterprise Session Border Controller’s health score if a media interface gateway heartbeat fails. If the value you set in the gateway time-out retry field is exceeded, this amount will be subtracted from the system’s overall health score. The default value is 0. The valid range is:
- Minimum—0
- Maximum—100

Media Interface Link Detection and Gateway Polling Configuration 2

To configure media interface link detection and gateway polling on a per-network-interface basis in the ACLI:

In Superuser mode, type configure terminal and press Enter.
```
ACMEPACKET# configure terminal
```
Type system and press Enter to access the system-level configuration elements.
```
ACMEPACKET(configure)# system
```
Type network-interface and press Enter.
```
ACMEPACKET(system)# network-interface
```
Type gw-heartbeat and press Enter. The system prompt changes to let you know that you can begin configuring individual parameters.
```
ACMEPACKET(network-interface)# gw-heartbeat
ACMEPACKET(gw-heartbeat)#
```
From here, you can configure gateway heartbeat parameters for the network interface. To view all gateway heartbeat parameters, enter a ? at the system prompt.
state—Enable or disable the gateway heartbeat feature. The default value is enabled. The valid values are:
- enabled | disabled
heartbeat—Enter the number of seconds between heartbeats for the media interface gateway. Heartbeats are sent at this interval as long as the media interface is viable. The default value is zero (0). The valid range is:
- Minimum—0
- Maximum—65535
  
  The value you configure in this field overrides any globally applicable value set in the gateway heartbeat interval parameter in the Oracle® Enterprise Session Border Controller HA node (redundancy) configuration.
retry-count—Enter the number of heartbeat retries that you want sent to the media interface gateway before it is considered unreachable. The default value is zero (0). The valid range is:
- Minimum—0
- Maximum—65535
retry-timeout—Enter the heartbeat retry time-out value in seconds. The default value is 1. The valid range is:
- Minimum—1
- Maximum—65535
  
  This parameter sets the amount of time between system ARP requests to establish media interface gateway communication after a media interface gateway failure.
health-score—Enter the amount to subtract from the system’s health score if a media interface gateway heartbeat fails; this parameter defaults to 0. If the value you set in the retry-time-out field is exceeded, this amount will be subtracted from the system’s overall health score. The default value is zero (0). The valid range is:
- Minimum—0
- Maximum—100