Design Reference

Figure 6: 1000BASE-X RFI
End-to-end fault detection and VLACP
Because remote fault indication (RFI) terminates at the next Ethernet hop, the device that uses only
RFI cannot determine failures on an end-to-end basis over multiple hops.
However, you can use Virtual Link Aggregation Control Protocol (VLACP) to provide an end-to-end
failure detection mechanism. You can configure VLACP on a port and enable it over single links or
multilink trunks (MLT).
You can use VLACP with MLT to enhance its capabilities and provide quick failure detection. With
VLACP, the device can detect far-end failures, which permits MLT to fail over properly when end-to-
end connectivity is not guaranteed for some links in an aggregation group.
Physical layer redundancy
December 2014 Network Design Reference for Avaya VSP 4000 Series 39
Comments? [e-mail]