Chapter 20 – Configuring GOOSE Tunnels
Chapter 20 – C onfiguri ng GOOSE Tunnels
Introduc tion
This chapter familiarizes the user with:
•Configu ring GO OSE Tun nels
•Viewing GOOSE Tunnel status and sta tistics
•Tracing GOOSE activity

IEC61850 GOOSE Fundame ntals

IEC61850 is an international standard for substation automation. It is a part of the
International Electrotechnical Commission’s (IEC) Technical Committee 57 (TC57)
architecture for electric power systems.
One feature of IEC61850 is the fast transfer of events. Transfers of Generic
Substation Events (GSEs) are accomplished through the GOOSE (Generic Object
Oriented Substation Event) protocol.
IEC61850 uses Layer 2 multicast frames to distribute its messages and hence, is
incapable of operating outside of a switched Ethernet Network. The GOOSE tunnel
feature provides a capability to bridge GOOSE frames over a WAN.
GOOSE tunnels provides you with the following features:
•GOOSE traffic is bridg ed over the WAN via UDP packet s.
•One GO OSE tra ffic sou rce can be map ped to multip le remo te rout er
Ethern et inter faces in mesh fashion .
•To redu ce bandw idth co nsumpti on, GOO SE daem ons may be loc ated at
each of the “l egs” an d at th e center of a s tar net work. The cen trally
located daemon will a ccept G OOSE p ackets and re- distribu te them .
•Statist ics rep orts av ailabil ity of remote GOOSE d aemons, packet count s
and Rou nd Trip Time ( RTT) for each re mote da emon.
•When Virtual Router Redundancy Protocol (VRRP) is employed, GOOSE
transport is improved by sending redundant GOOSE packets from each VRRP
gateway.
Layer 2 Tunnel Dae mon Details
The GOOSE protocol is supported by the Layer 2 Tunnel Daemon. The daemon
listens to configured Ethernet interfaces and to the network itself upon a configurable
UDP port.
The Media Access Control (MAC) destination address of frames received from
Ethernet is inspected in order to determine which GOOSE group they are in. The
frames are then encapsulated in network headers and forwarded (with MAC source
and destination addresses intact) to the network as GOOSE packets.
IEC61850 recommends that the MAC destination address should be in the range
01:0c:cd:01:00:00 to 01:0c:cd:01:01:ff.
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