MLD Snooping Configuration Guidelines and Restrictions
When configuring MLD snooping, follow these guidelines and restrictions:
•Only PFC3C and PFC3CXL modes support MLD version 1 (MLDv1) and MLD version 2 (MLDv2).
•These modes support only MLD version 2 (MLDv2):
–PFC3A
–PFC3B
–PFC3BXL
•MLD is derived from Internet Group Management Protocol version 3 (IGMPv3). MLD protocol operations and state transitions, host and router behavior, query and report message processing, message forwarding rules, and timer operations are exactly same as IGMPv3. See draft-vida-mld-.02.txt for detailed information on MLD protocol.
•MLD protocol messages are Internet Control Message Protocol version 6 (ICMPv6) messages.
•MLD message formats are almost identical to IGMPv3 messages.
•IPv6 multicast for Cisco IOS software uses MLD version 2. This version of MLD is fully backward-compatible with MLD version 1 (described in RFC 2710). Hosts that support only MLD version 1 interoperate with a router running MLD version 2. Mixed LANs with both MLD version 1 and MLD version 2 hosts are supported.
•MLD snooping supports private VLANs. Private VLANs do not impose any restrictions on MLD snooping.
•MLD snooping constrains traffic in MAC multicast groups 0100.5e00.0001 to 0100.5eff.ffff.
•MLD snooping does not constrain Layer 2 multicasts generated by routing protocols.
3300/3310/3750(TX/F)/8200RQ
Настройка IGMP Snooping
(QSW)(Config)#set igmp — включение IGMP Snooping
(QSW)(Config)#set igmp vlan 777 — выбор влана
(QSW)(Config)#set igmp fast-leave 777 — включение IGMP Snooping Fast Leave во влане
(QSW)(Config)#set igmp report-suppression 777 — подавление пакетов Report
(QSW)(Config)#set igmp report-suppression source-address 10.10.254.33 — source IP-адрес для отправки IGMP Report
(QSW)(Config)#interface 1/0/24
(QSW)(Interface 1/0/24)#igmp snooping mrouter-port — настройка mrouter порта
Настройка Querier
(QSW)(Config)#set igmp querier — включение querier
(QSW)(Config)#set igmp querier vlan 777 — выбор влана для querier
(QSW)(Config)#set igmp querier address 10.10.254.33 — ip-адрес querier
(QSW)(Config)#set igmp querier version 2 — выбор версии IGMP
Настройка ограничения мультикаст групп при помощи аксесс-листа
(QSW)(Config)#access-list 6000 permit any 224.1.1.1 0.0.0.255 — разрешенный диапазон
(QSW)(Config)#access-list 6000 deny every — запрет для всех остальных групп
(QSW)(Config)#interface 1/0/1
(QSW)(Interface 1/0/1)#ip access-group 6000 in — применения аксесс-листа на клиентском интерфейсе
Все остальные настройки можно посмотреть в мануалах, если появятся дополнительные вопросы необходимо обратится в техническую поддержку через систему Helpdesk.
Enabling the MLD Snooping Querier
Use the MLD snooping querier to support MLD snooping in a VLAN where PIM and MLD are not configured because the multicast traffic does not need to be routed.
To enable the MLD snooping querier in a VLAN, perform this task:
|
Command |
Purpose |
|
|---|---|---|
|
Step 1 |
Router(config)# interface vlan vlan_ID |
Selects the VLAN interface. |
|
Step 2 |
Router(config-if)# ipv6 address |
Configures the IPv6 address and subnet. |
|
Step 3 |
Router(config-if)# ipv6 mld snooping querier |
Enables the MLD snooping querier. |
|
Router(config-if)# no ipv6 mld snooping querier |
Disables the MLD snooping querier. |
|
|
Step 4 |
Router(config-if)# end |
Exits configuration mode. |
|
Step 5 |
Router# show ipv6 mld interface vlan vlan_ID | |
Verifies the configuration. |
This example shows how to enable the MLD snooping querier on VLAN 200 and verify the configuration:
Router# interface vlan 200
Router(config-if)# ipv6 address 2001:0DB8:0:1::/64 eui-64
Router(config-if)# ipv6 mld snooping querier
Router(config-if)# end
Router# show ipv6 mld interface vlan 200 | include querier
MLD snooping fast-leave is enabled and querier is enabled
MLD Snooping Querier Configuration Guidelines and Restrictions
When configuring the MLD snooping querier, follow these guidelines and restrictions:
•Configure the VLAN in global configuration mode (see ).
•Configure an IPv6 address on the VLAN interface (see ). When enabled, the MLD snooping querier uses the IPv6 address as the query source address.
•If there is no IPv6 address configured on the VLAN interface, the MLD snooping querier does not start. The MLD snooping querier disables itself if the IPv6 address is cleared. When enabled, the MLD snooping querier restarts if you configure an IPv6 address.
•When enabled, the MLD snooping querier does not start if it detects MLD traffic from an IPv6 multicast router.
•When enabled, the MLD snooping querier starts after 60 seconds with no MLD traffic detected from an IPv6 multicast router.
•When enabled, the MLD snooping querier disables itself if it detects MLD traffic from an IPv6 multicast router.
•QoS does not support MLD packets when MLD snooping is enabled.
•You can enable the MLD snooping querier on all the switches in the VLAN that support it. One switch is elected as the querier.
