User's Manual

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Bridges Hardware Guide Silver Spring Networks 16

2 Deploying Silver Spring Networks Bridges

The Bridge Configurator program provides the settings to associate the DNP3-based RTU

address with each Remote bridge.

IPv6 Addressing in the RF Network

When a device registers with a subnet, the master bridge assigns it an IPv6 prefix, which the

device appends to its MAC address to create a globally unique IPv6 unicast address, formatted

according to the IEEE EUI-64 standard.

All Silver Spring IPv6 network addresses contain the prefix 2001:1868:209::/48 (defined at

the manufacturing facility, this value cannot be changed) with a 16-bit reserved subnet value

(0xfffd) and the MAC address of the device.

For example:

2001:1868:209:fffd::/64+MAC Address

When the master sends a message to one of the RTUs, it contains the IPv6 prefix plus the MAC

address of the eBridge master.

For example, given an original Ethernet MAC address for an eBridge master:

00-0C-F1-56-98-AD

Each Silver Spring Networks bridge provides a sticker on the rear of the case showing the 64-bit

MAC address of the device. This value is the EUI-64 value, containing the inserted 0xfffd value

to extend the original 48-bit MAC to a 64-bit MAC address.

00:0C:F1:

:56:98:AD

When operating in the RF network in IPv6, the bridge recalculates the MAC to the bridge’s IPv6

unicast address by complementing the high-order byte of the EUI-64 MAC address and

appending it to the prefix.

2001:1868:209:fffd:

0C:F1FF:FE56:98AD

When the remote bridge sends a message back to the master eBridge, the message must contain

that same prefix and IPv6 unicast address in its packet header. This value also appears in

diagnostics and logs, in the Bridge Configurator software, as a true IPv6 unicast address.

Note: Each sBridge and eBridge provides the device’s unique IEEE EUI-64 MAC address in a sticker

on the back of the bridge chassis. In this case, the high-order byte is not complemented, remaining as

0x00, as it is the 64-bit MAC hardware address of the device.

Ethernet Teaming Sample Deployment

In Ethernet teaming, a group of bridges send each other messages to accomplish specific tasks

with reclosers. In a traditional DA communications network, all devices communicate with one

or more SCADA masters. Individual DA devices, such as capacitor banks or reclosers, do not

communicate with each other.

However, new types of reclosers can communicate with their neighbor reclosers to effect a

coordinated switching action in the event of an electrical fault. This helps rapidly isolate the

electrical fault and reduce the duration of the electrical outage. For reclosers to communicate

with each other, Teaming mode is required. Teaming mode forces each member of a team to