IPv6 Unicast Forwarding Control

This section describes the different roles of NetEngine 8000 Fs as broadband remote access servers (BRASs), Dynamic Host Configuration Protocol version 6 (DHCPv6) servers, and DHCPv6 relay agents respectively in Internet Protocol version 6 (IPv6) unicast forwarding control.

On the network shown in Figure 1, Device-1 and Device-2 function as BRASs and run redundancy user information (RUI). A Virtual Router Redundancy Protocol (VRRP) backup group is configured for the two Devices, with Device-1 as the master and Device-2 as the backup. When the link between the switch (SW) and Device-1 goes faulty, the fault triggers a master/backup VRRP switchover. Then, Device-2 becomes the master and starts neighbor discovery (ND) detection, and Device-1 becomes the backup and stops the ND detection. If the link-local address or MAC address on an interface of Device-2 is different from that of an interface on Device-1, some users will go offline, or some user packets will be discarded.

Figure 1 Active link fault on the access side

To prevent a user from detecting the active link fault, Device-2 must use the same link-local address and MAC address as those of Device-1.

Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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