VM Networking Requirements

B VM Networking Requirements

This section gives information on the networking characteristics of the different VMs. The traffic is broken down into signaling traffic handled on the XMI network, and OAM traffic carried on the IMI and XMI networks.

The Diameter Traffic requirements on the XSI networks can be calculated from the MPS. Treating the OCDSR as black box, this network traffic is simply the average Diameter message size (for requests and answers) times the MPS rate for the OCDSR node. The complication is that some Diameter traffic is likely to go through both an ingress DA-MP and an egress DA-MP. The most conservative consumption is that any ingress message is equally likely to go out any of the DA-MPs. Thus, if a DSR has X DA-MPs,and Y total MPS per DA-MP, the average Diameter signaling traffic through a DA-MP is:

((Average Diameter message size including IP overhead) * Y) * (1+ ((2X-1)/X))

As an example, if the average Diameter message size is 2,000 bytes including overhead, the overall DSRMPS is 10000 MPS, and the number of DA-MPs is three, the calculation would be:

(2,000 bytes * 8 bits/byte *10,000 MPS) * (1+ (2*3 DA-MPs) -1)/(3 DA-MPs)) = (160,000 kb/s) * (2.66) = 426,666 kb/s per DA-MP

For the MP types other than the DA-MPs simply substitute the average size of signaling types, for instance SS7 messages for the vSTP MP. Since typically SS7 messages are much smaller than Diameter messages (for instance ~200 bytes for SMS), the vSTP MP bandwidth is much smaller than the DA-MP bandwidth.

The OAM traffic on the VMs can be much more variable since it’s dependent to customer-specific usage patterns such as the number of reports requested and the number of periodic activities (backups and restores). The notes for each VM type give some background on the network impacts of these customer-driven activities.

Table B-1 VM Networking Utilization Characteristics

VM Name	Networks Supported	Management Networks (Gb/s)	Traffic Networks (Gb/s)	Notes
DSR NOAM	XMI IMI	2	N/A	Activities such as backups can generate higher network utilization but runs at the rate of the bandwidth available since they are not real-time activities.
DSR SOAM	XMI IMI	1	N/A
DA MP	XMI IMI XSI	0.2	MPS Dependent	See explanation above for how to calculate the signaling network traffic.
DA MP w/IWF
vSTP MP
IPFE	XMI IMI XSI	0.2	MPS Dependent	The peak networking capacity supported by the IPFE is 3.2 Gb/s. Typically, the IPFE is deployed only on the ingress (towards clients such as MMEs) side of the DA-MP, so the total traffic through the IPFE is ½ the total bandwidth of the DA-MPs.
SBR(s)	XMI IMI	1.0	N/A	The given OAM bandwidth is for routine operations. Some recovery operations such as synchronizing the database between the active and standby servers after a prolonged disconnection can consume an order of magnitude or more of network bandwidth. The required amount of bandwidth for these recovery operations is very dependent on customer-factors such as number of subscribers, the MPS rate, and the amount of networking downtime.
SBR(b)
SBR(u)
SDS NOAM	XMI IMI	1.0	N/A	The maximum bandwidth required by the SDS NOAM is determined primarily by the provisioning rate from external customer systems along with the size of the customer records.
DP SOAM	XMI IMI	1.0	N/A	All of the subscriber data provisioned at the SDSNOAM is passed down to each DP SOAM, which then distributes the data to any attached DPs.
DP	XMI IMI	1.0	N/A	The DP receives writes of new subscriber records from the SOAM, and database queries from the DA-MPs.
Query Server	XMI IMI	1.0	N/A	The Query Server is synchronized to the changes in the SDS NOAM. In addition, there is some network traffic due to customer search requests, but this traffic is small compared to the synchronization traffic.
UDR NO	XMI IMI XSI	1.0	N/A	UDR NO receives internal query from STP MP and DAMP.

The following table shows some guidelines for mapping the logical OCDSR networks (XMI, IMI, so on) to interfaces. There is nothing fixed about these assignments in the application, so they can be assigned as desired if the customer has other requirements driving interface assignment.

Table B-2 Typical OCDSR Network to Device Assignments

VM Name	OAM (XMI)	Local (IMI)	Signaling A (XSI1)	Signaling B (XSI2)	Signaling C (XSI3)	Signaling D (XSI6)	Replication (SBR Rep)
DSR NOAM	eth0	eth1
DSR SOAM	eth0	eth1
DA-MP	eth0	eth1	eth2	eth3	eth4	eth17	eth18
IPFE	eth0	eth1	eth2	eth3	eth4	eth17
SBRB	eth0	eth1					eth2
SBRS	eth0	eth1					eth2
vSTP	eth0	eth1	eth2	eth3	eth4	eth17
UDRNO	eth0	eth1	eth2	eth3	eth4	eth17
SDS NOAM	eth0	eth1
DP	eth0	eth1
Query Server	eth0	eth1