Configurator Procedure for IP Forward Filter
Select either port filtering or system filtering, depending upon your selection criteria. The port filtering must be specified as either incoming or outgoing (select one).
All filtering along the IP stream of the call must be defined. Otherwise, voice delay may occur.
- Select Configure, Protocols, IP, IP Filtering, and Incoming or Outgoing.
You will see the IP Port Incoming Filter or IP Port Outgoing Filter window.
- At the top of the window, click Add Filter. You will see the Add an IP Port (Incoming/Outgoing) Filter window:
The table below describes the required parameters:
| Parameter | Range of Values | Required Actions |
|---|
| Port Number | INTEGER (1..255) | Enter the port you want to add the filter to. |
| Mask | IPAddress | Enter the IP address of the filter mask. |
| Address | IPAddress | Enter the IP address of the filter address. |
| Protocol ID | INTEGER (1.255) | Enter the INTEGER(s) that represent the correct protocol type for this Passport 4400. |
| Port Id | INTEGER (1..65535) | Enter the INTEGER(s) that represent the Port ID. |
| Source/ Destination | Source | Destination | Select the applicable radio button. |
| Priority (Outgoing Filter) | Low, Medium, High | This value determines the priority of the traffic on this filter. |
| Filter Action | Forward | Discard | This value determines the priority order of the traffic on this filter. |
| Order | INTEGER (1..255) | This value determines the filter order in the filter table. |
- Enter the above parameters then click Save. A "Command Successful" appears.
You must define the above parameters for both the Master and Slave sides of the connection and any other router that is used for filtering in the network.
With the configuration illustrated on the next page, the IP packet, tagged with priority High, is sent down to the Virtual Port Management (VPM) module. The VPM looks up its Switched Virtual Circuit (SVC) table and chooses SVC1 to transfer the packet as that SVC has the highest priority. Similiar sequences occur on the slave side. The only difference between the master side and the slave is that the slave side creates its own SVC table and sets the transmission priorities (TPs) for the SVCs only after it receives the call setup request from the master side.
The VPM has to be able to handle the times when the number of SVCs available is less than the number of IP priorities configured. For example, if for some reason SVC2 goes down, there are three other scenarios that can be used to transfer the packets from the master to the slave side.
- VPM transfers the IP packet over SVC1 as if all three SVCs are functioning. This is possible because SVC1 has the highest TP.
- VPM transfers the IP packets with medium TP over SVC3. SVC3 becomes the SVC that is up and the second highest TP.
- If a user sends a data packet with a low priority, and there is no SVC up with a TP of 3 to the requested destination, VPM transfers the IP packets over SVC3 because it is the next highest TP.
End of Topic
