Huawei Technologies Huawei Technologies Associated Channel over IPv6 (ACH6) provides a control channel to one specific IPv6 forwarding path for control and management purpose. When ACH6 is used in a Segment Routing network, it provides a control channel to an SRv6 path. This document specifies an SRv6 ACH6 mechanism and describes how ACH6 is applied in a Segment Routing network.