This procedure describes how to add or modify a Loopback Address.
Loopback Interface
To modify a Loopback Interface:
To enable a Loopback Interface:
To disable a Loopback Interface:
Sonus SBC 1000/2000 | Loopback IP: 172.16.40/24 | App-IP: 138.51.200.220/24 |
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Cisco Router | Eth4/0: 138.51.200.220/24 |
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In this example the Cisco device can ping 138.51.200.220. But, by default, it is unable ping 172.16.40.1. So a static route must be established on the Cisco device before it can reach 172.16.40.0/24 through 138.51.200.220.
The advantage of using a loopback interface is that SIP may use 172.16.40.1 in its configuration, and the interface IP addresses may be changed without impacting current calls in progress or SG configurations. When interface IP addresses are changed, it may affect RTP/RTCP packets using that interface, as would any network-level change. Calls in progress or SG configurations on the Sonus SBC 1000/2000 and other SIP-layer peers of Sonus SBC 1000/2000 will not have to be suspended, re-configured, torn-down, or re-established in any way. The applications use IP addresses completely isolated from the IP addresses that are used on the links/networks.
The Identification/Status Panel controls the network identity of the port and its administrative state (Up or Down). It also provides the port's current service status and when that status last changed.
Specifies an alias for the port. This text is configured by the operator for exclusive use by SNMP-based element and network management systems to assign a key to the port or interface, that is unique across the managed network. Examples would be "Node10Port5" and "VerizonPort5"
Specifies the administrative state of the port. Valid entries: Enabled or Disabled.
Specifies the Primary or Secondary IP Address of this loopback interface.
Specifies the network mask applied to either the Primary or Secondary IP Address.
Specifies whether or not a secondary IP address is configured for this loopback interface.
Specifies the Access Control List to be used on this interface when filtering outgoing packets. Select from the drop down list (populated from the Access Control List table). For more information about Access Control Lists, see Managing Access Control Lists.