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Appendix
Processing of IPv6 multicast protocol messages
With Layer 3 multicast routing enabled, an MLD snooping–enabled switch processes IPv6 multicast
protocol messages differently under different conditions, as follows:
•
If only MLD is enabled on the switch, or if both MLD and IPv6 PIM are enabled on the switch,
the switch does the following:
{
Maintains dynamic member ports or dynamic router ports according to MLD packets
{
Maintains dynamic router ports according to IPv6 PIM hello packets
•
If only IPv6 PIM is enabled on the switch, the following occurs:
{
The switch broadcasts MLD messages as unknown messages in the VLAN.
{
After receiving an IPv6 PIM hello message, the switch maintains the corresponding
dynamic router port.
•
If MLD is disabled on the switch, one of the following occurs:
{
If IPv6 PIM is disabled, the switch deletes all its dynamic member ports and dynamic router
ports.
{
If IPv6 PIM is enabled, the switch deletes only its dynamic member ports but not its dynamic
router ports.
NOTE:
On a switch with Layer 3 IPv6 multicast routing enabled, use the
display mld group port-info
command to display Layer 2 port information.
•
If IPv6 PIM is disabled on the switch, one of the following occurs:
{
If MLD is disabled, the switch deletes all its dynamic router ports.
{
If MLD is enabled, the switch maintains all its dynamic member ports and dynamic router
ports.
