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Host port(s):total 1 port(s).

GE1/0/3 (D) ( 00:04:10 )

MAC group(s):

MAC group address:3333-0000-0101

Host port(s):total 1 port(s).

GE1/0/3

The output shows that GigabitEthernet 1/0/3 on Switch B has joined FF1E::101 but not FF1E::102.

Assume that Source 2 starts sending multicast traffic to FF1E::101. Use the display multicast ipv6

forwarding-table to display the IPv6 multicast forwarding table information.

# Display the information about FF1E::101 in the IPv6 multicast forwarding table on Switch A.

[SwitchA] display multicast ipv6 forwarding-table ff1e::101

IPv6 Multicast Forwarding Table

Total 1 entry

Total 1 entry matched

00001. (1::1, FF1E::101)

MID: 0, Flags: 0x0:0

Uptime: 00:08:32, Timeout in: 00:03:26

Incoming interface: Vlan-interface101

List of 1 outgoing interfaces:

1: Vlan-interface104

Matched 19648 packets(20512512 bytes), Wrong If 0 packets

Forwarded 19648 packets(20512512 bytes)

The output shows that Switch A maintains a multicast forwarding entry for multicast packets from Source

1 to FF1E::101. No forwarding entry exists for packets from Source 2 to FF1E::101. It indicates that

IPv6 multicast packets from Source 2 are blocked.

Troubleshooting MLD snooping

Layer 2 multicast forwarding cannot function

Symptom

Layer 2 multicast forwarding cannot function.

Analysis

MLD snooping is not enabled.

Solution

1. Use the display current-configuration command to display the running status of MLD snooping.

2. If MLD snooping is not enabled, use the mld-snooping command to enable MLD snooping globally,

and then use mld-snooping enable command to enable MLD snooping in VLAN view.

3. If MLD snooping is disabled only for the corresponding VLAN, use the mld-snooping enable

command in VLAN view to enable MLD snooping in the corresponding VLAN.

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HP A5500 SI Switch Series Specifications

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