(Optional) Configuring VRRP6 Advertisement Packet Attributes

Context

VRRP6 Advertisement packets are used to advertise the master router's priority value and status to other VRRP6 routers in a VRRP6 group. Sending the VRRP6 Advertisement packets helps implement status transition and master election. VRRP6 packets have the following attributes:

VRRP6 TTL detection: A VRRP-enabled device checks the TTL in every received VRRP6 Advertisement packet and discards the packets in which the TTL is not 255. On a network with Huawei and non-Huawei devices, this function needs to be disabled to prevent packet loss.
Sending ND packets carrying only the minimal inner VLAN ID: A QinQ termination sub-interface sends ND packets with two tags and the inner tag is a range of VLAN IDs. To ensure that switches connected to users learn the correct MAC address of the VRRP group, the VRRP group on the QinQ termination sub-interface sends ND packets to all VLANs identified by inner VLAN IDs. This increases the burden on the VRRP-enabled device. To relieve the burden, the VRRP-enabled device can be configured to send ND packets carrying only the minimal inner VLAN ID.

Procedure

Disable VRRP6 TTL check.
1. Run system-view
  The system view is displayed.
2. Run interface interface-type interface-number
  The interface view is displayed.
3. (Optional) On an Ethernet interface, run undo portswitch
  The interface is switched to Layer 3 mode.
  
  By default, an Ethernet interface works in Layer 2 mode.
  
  Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support switching between Layer 2 and Layer 3 modes.
4. Run vrrp6 un-check hop-limit
  The device is configured not to check the TTL value in VRRP6 Advertisement packets.
  
  By default, the system checks the TTL value in VRRP6 Advertisement packets.
5. Run quit
  The system view is displayed.
Configure the VRRP-enabled device to send ND packets carrying only the minimal inner VLAN ID.
1. Run interface interface-type interface-number.subinterface-number
  The view of an Ethernet sub-interface or Eth-Trunk sub-interface that is configured with QinQ VLAN tag termination is displayed.
2. Run vrrp6 nd send-mode simple
  The QinQ termination sub-interface in the Master state is configured to send ND packets carrying the outer VLAN ID and the minimal inner VLAN ID.
  
  Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.