To configure Ethernet Bandwidth Notification on a 7705 SAR Ethernet port

Before you begin

The 7705 SAR can interop with ETH-BN communication from the Wavence SM over Ethernet links (without MWA). ETH-BN is supported on the following ports:

  • 8p GigE v1/v2/v3

  • XMDA v1/v2

  • 8p PMC

  • 6p 10GigE/GigE

  • Ethernet modules in the 7705 SAR-H and 7705 SAR-M

  • Virtual port of Ring MDA and 7705 SAR-M module

  • all Ethernet ports for the 7705 SAR-A, 7705 SAR-Ax, 7705 SAR-H, 7705 SAR-Hc, 7705 SAR-M, 7705 SAR-W and 7705 SAR-Wx

ETH-BN enables the detection and extraction of ETH-BN messages to the CSM. If the ETH-BN indicates a new throughput value, the CSM programs the new value into the egress-rate of the port.

The 7705 SAR only supports the client side of ETH-BN. When enabled on a port, the egress rate that previously was a fixed bandwidth, may be dynamically altered based on the available bandwidth indicated by the ETH-BN server.

Steps
 
1 

On the equipment tree, navigate to the port object on the required 7705 SAR NE. The path is Network→NE→Shelf→Card Slot n→Daughter Card Slot n→Port n/n/n.

2 

Right-click on the required port and choose Properties. The Physical Port (Edit) form opens.

3 

Click on the Ethernet tab and enable the Bandwidth Rate Change Notification parameter.

Note: ETH-BN notification can only be enabled if the Egress Rate (kbps) parameter is configured. The maximum egress rate is the native port rate, e.g. 1 Gbit/s, and the minimum egress rate for the port can be as low as 1 kbit/s. Any rate request outside of this range, including 0, cannot be followed. The egress rate setting has a +/- 1% accuracy, as rate conversion to the hardware is necessary. Any request to change less than 1% is ignored.

Note: The bandwidth indicated in the Bandwidth Notification Message from the Wavence SM includes the FCS. You must enable the Egress Rate Include FCS parameter in the Egress Rate panel or the bandwidth will not match the intended rate.

4 

To reduce the number of bandwidth changes, configure the Bandwidth Rate Hold Time (seconds) parameter.

Note: Any Bandwidth Notification Message received before the hold-timer expires, after the last bandwidth change, is ignored (not stored).

5 

Save your changes and close the forms.

Operational information on the number of BN changes, messages statistics, previous bandwidth value etc. is displayed in the Egress Rate panel and the Ethernet Bandwidth Notification Counters panel.

End of steps