Table of Contents

Chapter 1 MLD Configuration Commands. 1-1

1.1 MLD Configuration Commands. 1-1

1.1.1 debugging mld. 1-1

1.1.2 display mld group. 1-5

1.1.3 display mld group port-info. 1-7

1.1.4 display mld interface. 1-9

1.1.5 display mld routing-table. 1-11

1.1.6 last-listener-query-interval 1-12

1.1.7 max-response-time. 1-12

1.1.8 mld. 1-13

1.1.9 mld enable. 1-14

1.1.10 mld last-listener-query-interval 1-15

1.1.11 mld max-response-time. 1-16

1.1.12 mld require-router-alert 1-16

1.1.13 mld robust-count 1-17

1.1.14 mld send-router-alert 1-18

1.1.15 mld timer other-querier-present 1-19

1.1.16 mld timer query. 1-20

1.1.17 mld version. 1-21

1.1.18 require-router-alert 1-21

1.1.19 reset mld group. 1-22

1.1.20 robust-count 1-23

1.1.21 send-router-alert 1-24

1.1.22 timer other-querier-present 1-25

1.1.23 timer query. 1-26

1.1.24 version. 1-26

 

Chapter 1  MLD Configuration Commands

 

 

1.1  MLD Configuration Commands

1.1.1  debugging mld

Syntax

debugging mld { all | done [ basic-acl6-number ] | event | query [ advanced-acl6-number ] [ receive | send ] | report [ advanced-acl6-number ] | timer }

undo debugging mld { all | done | event | query [ receive | send ] | report | timer }

View

User view

Default Level

1: Monitor level

Parameters

all: Turns on/off all types of debugging for MLD.

done: Turns on/off MLD done message debugging.

basic-acl6-number: Specifies the number of the basic IPv6 access control list.

event: Turns on/off  MLD event debugging.

query: Turns on/off MLD query message debugging.

advanced-acl6-number: Specifies the number of the advanced IPv6 access control list.

receive: Turns on/off debugging for received MLD query messages.

send: Turns on/off debugging for sent MLD query messages.

report: Turns on/off debugging for MLD report messages.

timer: Turns on/off debugging for MLD timers.

Description

Use the debugging mld command to enable MLD debugging.

Use the undo debugging mld command to disable MLD debugging.

By default, MLD debugging is disabled.

Table 1-1 debugging mld event command output description

Field	Description
Creating/creation/created aux join/aux prune adding interface/deleting downstream deleteing/unregister/deleted Enqueue/Dequeuing Elected/Un-elected	Event types, including: Creating/creation/created Join/prune Adding outgoing interface/removing outgoing interface Deleting/unregistered/deleted Enqueuing/dequeuing Elected/Lost the election
Interface interfacename(ifadd)	Interface that responded the event (interface address)
(sadd, gadd)	(S, G) entry
(*, gadd)	(*, G) entry

 

Table 1-2 debugging mld done command output description

Field	Description
DONE	Message type: MLD done message
Interfacename(ifadd)	Interface on which the message was received (interface address)
group gadd	IPv6 group address in the done message
Ignoring	Ignoring this MLD done message

 

Table 1-3 debugging mld query send command output description

Field	Description
version	The version of the MLD query message
Interfacename(ifadd)	Interface on which the message was received/sent (interface address)
Ignoring	Ignoring this MLD query message
Send	Sent MLD query message
With/without s-bit	With/without the S-bit set
General/group specific query	MLD general query/MLD multicast-address-specific query
Group gadd	The queried IPv6 group address

 

Table 1-4 debugging mld query receive command output description

Field	Description
version	The version of the MLD query message
Interfacename(ifadd)	Interface on which the message was received/sent (interface address)
Ignoring	Ignoring this MLD query message
Received	Received MLD query message
General/group specific query	MLD general query/MLD multicast-address-specific query
Group gadd	The queried IPv6 group address

 

Table 1-5 debugging mld report command output description

Field	Description
Ignoring	Ignoring this MLD membership report message
IS_IN/IS_EX/TO_IN/TO_EX/ALLOW/BLOCK	Record type of the membership report message
Group gadd	IPv6 group address in the MLD membership report message
(sadd, gadd)	(S, G) entry
v1/v2	Version of the MLD membership report message
Interfacename(ifadd)	Interface on which the message was received/sent (interface address)

 

Table 1-6 debugging mld timer command output description

Field	Description
Lmqi timeout for group	LMQI timer timed out
Other querier present interval	Other querier present timer timed out
Interfacename(ifadd)	Interface on which the message was received/sent (interface address)
Deleting v1 host timer	MLDv1 host aging timer timed out
Setting v1 host timer	Setting MLDv1 host aging timer

 

Examples

# Enabling MLD event debugging

<Sysname> debugging mld event

* Mar 26 14:20:10:635 2007 Sysname MLD/7/EVENT:Elected querier on interface

Vlan-interface11(FE80::200:5EFF:FE01:6C00) (G10297)

// The interface is elected as the MLD querier

* Mar 26 14:20:12:635 2007 Sysname MLD/7/EVENT:Un-elected querier on interface Vlan-interface11(FE80::200:5EFF:FE01:6C00) (G10456)

// The interface becomes a non-querier

* Mar 26 14:20:14:635 2007 Sysname MLD/7/EVENT:MLDV2 (*, FF0E::101:101) aux join received on interface Vlan-interface11(FE80::200:5EFF:FE01:6C00) (G01600)

// The interface receives a join message

* Mar 26 14:20:15:635 2007 Sysname MLD/7/EVENT:(*, FF0E::101:101) entry created in global MRT (G01609)

* Mar 26 14:20:15:635 2007 Sysname MLD/7/EVENT:Adding interface Vlan-interface11(FE80::200:5EFF:FE01:6C00) to downstream IN tree for (*, FF0E::101:101) (G01629)

* Mar 26 14:20:16:635 2007 Sysname MLD/7/EVENT:Creating group(FF0E::101:101) for interface Vlan-interface11(FE80::200:5EFF:FE01:6C00) (G013082)

// Group FF0E::101:101 is added in an entry, with VLAN-interface 11 as the outgoing interface

* Mar 26 14:20:19:635 2007 Sysname MLD/7/EVENT:Enqueue group(FF0E::101:101) on interface Vlan-interface11(FE80::200:5EFF:FE01:6C00) in group_calq. (G014076)

// An aging timer is set for the group

* Mar 26 14:20:20:635 2007 Sysname MLD/7/EVENT:Dequeing group(FF0E::101:101) on interface Vlan-interface11(FE80::200:5EFF:FE01:6C00) from group_calq. (G014028)

* Mar 26 14:20:22:635 2007 Sysname MLD/7/EVENT:Enqueue group(FF0E::101:101) on interface Vlan-interface11(FE80::200:5EFF:FE01:6C00) in group_calq. (G014076)

// The aging timer is reset when an MLD done message is received on the interface

* Mar 26 14:20:40:635 2007 Sysname MLD/7/EVENT:Lmqi timeout for group(FF0E::101:101), sending last listener query on interface Vlan-interface11(FE80::200:5EFF:FE01:6C00). (G013428)

* Mar 26 14:20:48:635 2007 Sysname MLD/7/EVENT:Enqueue group(FF0E::101:101) on interface Vlan-interface11(FE80::200:5EFF:FE01:6C00) in group_calq. (G014076)

// An MLD multicast-address-specific query is sent out when LMQI timer times out

* Mar 26 14:20:55:635 2007 Sysname MLD/7/EVENT:Group(FF0E::101:101) expired and sources empty. Deleting this group on interface Vlan-interface11(FE80::200:5EFF:FE01:6C00). (G013318)

* Mar 26 14:20:58:635 2007 Sysname MLD/7/EVENT:Deleting group(FF0E::101:101) on interface Vlan-interface11(FE80::200:5EFF:FE01:6C00) (G014170)

* Mar 26 14:20:58:635 2007 Sysname MLD/7/EVENT:Group(FF0E::101:101) deleted (G01805)

// As no MLD membership report is received, the group is removed from the table entry

1.1.2  display mld group

Syntax

display mld group [ ipv6-group-address | interface interface-type interface-number ] [ static | verbose ]

View

Any view

Default Level

1: Monitor level

Parameters

ipv6-group-address: Specifies an IPv6 multicast group.

interface-type interface-number: Specifies an interface by its type and number. At present, only VLAN interfaces are supported for the S9500 series switches.

static: Displays the MLD multicast group information of static joins

verbose: Displays detailed MLD multicast group information.

Description

Use the display mld group command to view MLD multicast group information.

Note that:

l           If you specify neither an interface nor an IPv6 group address, this command will display the information of all MLD multicast groups on all interfaces.

l           If you specify an IPv6 multicast group address without specifying an interface, this command will display the information of the specified IPv6 multicast group on all interfaces

l           If you specify an interface without specifying an IPv6 multicast group address, this command will display the information of all the MLD multicast groups on this interface.

l           If you do not specify the static keyword, the MLD multicast group information of only dynamic joins will be displayed.

Examples

# View the detailed MLD multicast group information of dynamic joins on all interfaces.

<Sysname> display mld group verbose

Interface group report information

 Vlan-interface21(FE80::20F:E2FF:FE45:8345):

  Total 1 MLD Group reported

   Group: FF1E::101:101

     Uptime: 00:01:23

     Expires: 00:01:32

     Last reporter: FE80::20F:E2FF:FE45:8345

     Last-listener-query-counter: 0

     Last-listener-query-timer-expiry: off

     Group mode: exclude

     Version1-host-present-timer-expiry: 00:01:32

Table 1-7 display mld group command output description

Field	Description
Group	IPv6 multicast group address
Uptime	Amount of time since the IPV6 multicast group was added in the table entry
Expires	Remaining time of the IPv6 multicast group
Last reporter	IPv6 address of the last host that has reported group membership
Last-listener-query-counter	Number of multicast-address-specific queries sent
Last-listener-query-timer-expiry	Remaining time of the last-listener query response delay timer
Group mode	Filtering mode for multicast groups
Version1-host-present-timer-expiry	MLDv1 host timeout time

 

1.1.3  display mld group port-info

Syntax

display mld group port-info [ vlan vlan-id ] [ slot slot-id ] [ verbose ]

View

Any view

Default Level

1: Monitor level

Parameters

vlan-id: Displays the information about Layer 2 ports of MLD multicast groups in the specified VLAN. If you do not specify a VLAN ID, the information of Layer 2 ports of MLD multicast groups in all VLANs will be displayed.

slot slot-id: Displays the information about Layer 2 ports of MLD multicast groups on the specified board. If you do not specify a slot number, only the information about Layer 2 ports of MLD multicast groups on the SRPU will be displayed.

verbose: Displays the detailed information about Layer 2 ports of MLD multicast groups.

Description

Use the display mld group port-info command to view the Layer 2 port information of MLD multicast groups.

Examples

# View the detailed information about Layer 2 ports of multicast groups on the specified board.

<Sysname> display mld group port-info slot 7 verbose

    Total 1 IP Group(s).

    Total 1 IP Source(s).

    Total 1 MAC Group(s).

 

  Port flags: D-Dynamic port, S-Static port, A-Aggregation port, C-Copy port

  Subvlan flags: R-Real VLAN, C-Copy VLAN

  Vlan(id):21.

    Total 1 IP Group(s).

    Total 1 IP Source(s).

    Total 1 MAC Group(s).

    Router port unit board: Mask(0x0)

    Router port(s):total 0 port.

    IP group(s):the following ip group(s) match to one mac group.

      IP group address:FF1E::101:25F

        (::, FF1E::101:25F):

          Attribute:    Host Port

          Host port unit board: Mask(0x0)

          Host port(s):total 1 port.

            Eth7/1/10             (D) ( 00:02:32 )

    MAC group(s):

        MAC group address:3333-0101-025f

          Host port unit board: Mask(0x0)

          Host port(s):total 1 port.

            Eth7/1/10

Table 1-8 display mld group port-info command output description

Field	Description
Total 1 IP Group(s)	Total number of IPv6 multicast groups
Total 1 IP Source(s)	Total number of IPv6 multicast sources
Total 1 MAC Group(s)	Total number of MAC multicast groups
Port flags: D-Dynamic port, S-Static port, A-Aggregation port, C-Copy port	Port flag: D stands for dynamic port, S for static port, A for aggregated port, and C for port copied from a (*, G) entry to an (S, G) entry.
Subvlan flags: R-Real VLAN, C-Copy VLAN	Sub-VLAN flag: R stands for real egress sub-VLAN under the current entry, and C for sub-VLAN copied from a (*, G) entry to an (S, G) entry.
Vlan(id)	VLAN ID
Mask(0x0)	Board mask (0x0 indicates that the ports on the current board have joined the multicast group, while no ports on other boards join the multicast group)
Router port(s)	Information about router ports
IP group(s):the following ip group(s) match to one mac group.	Information about the IPv6 multicast group
IP group address	Address of an IPv6 multicast group
(::, FF1E::101:25F)	(*, G) entry
Attribute	Attribute of an IPv6 multicast group
Host port(s)	Information about host member ports
( 00:02:32 )	Remaining time of a dynamic member port or router port aging timer
MAC group(s)	Information about MAC multicast groups
MAC group address	Address of the MAC multicast group

 

1.1.4  display mld interface

Syntax

display mld interface [ interface-type interface-number ] [ verbose ]

View

Any view

Default Level

1: Monitor level

Parameters

interface-type interface-number: Specifies a interface by its type and number. If you do not specify an interface, the information of all interfaces running MLD will be displayed. At present, only VLAN interfaces are supported by the S9500 series switches.

verbose: Displays detailed MLD configuration and running information.

Description

Use the display mld interface command to view MLD configuration and running information on the specified interface or all MLD-enabled interfaces.

Examples

# View the detailed MLD configuration and running information on VLAN-interface 2.

<Sysname> display mld interface vlan-interface2 verbose

 Vlan-interface2 (FE80:: 20F:E2FF:FE45:7995):

   MLD is enabled

 

   Current MLD version is 1

   Value of query interval for MLD(in seconds): 125

   Value of other querier present interval for MLD(in seconds): 255

   Value of maximum query response time for MLD(in seconds): 10

   Value of last listener query interval(in seconds): 1

   Value of startup query interval(in seconds): 31

   Value of startup query count: 2

   General query timer expiry (hours:minutes:seconds): 00:00:05

   Querier for MLD: FE80::20F:E2FF:FE45:7995 (this router)

   MLD activity: 1671 joins, 1159 leaves

   Multicast ipv6 routing on this interface: enabled

   Robustness: 2

   Require-router-alert: disabled

   Startup-query-timer-expiry: off

   Other-querier-present-timer-expiry: off

  Total 512 MLD Groups reported

Table 1-9 display mld group port-info command output description

Field	Description
Vlan-interface2 (FE80:: 20F:E2FF:FE45:7995):	Interface name (IPv6 link-local address)
Current MLD version is 2	Version number of the MLD run on the interface
MLD group policy	MLD group policy
Value of query interval for MLD (in seconds)	Interval between general query messages (in seconds)
Value of other querier present interval for MLD (in seconds)	MLD other querier present interval (in seconds)
Value of maximum query response time for MLD (in seconds)	Maximum response delay of general query messages (in seconds)
Value of last listener query interval (in seconds)	Interval for sending multicast-address-specific messages (in seconds)
Value of startup query interval(in seconds)	Interval between MLD general queries on startup
Value of startup query count	Number of MLD general queries sent on startup
General query timer expiry	Remaining time of the MLD general query timeout timer
Querier for MLD	IPv6 link-local address of the MLD querier
MLD activity	Statistics of MLD activity statistics (number of join and done messages)
Robustness	Robustness variable of an MLD querier
Require-router-alert	Indicates whether MLD messages without the Router-Alert option is discarded
Startup-query-timer-expiry	Remaining time of the startup query timer
Other-querier-present-timer-expiry	Remaining time of the MLD other querier present timer
Total 512 MLD Groups reported	Total number of MLD multicast groups recorded on the interface

 

1.1.5  display mld routing-table

Syntax

display mld routing-table [ ipv6-source-address [ prefix-length ] | ipv6-group-address [ prefix-length ] ] *

View

Any view

Default Level

1: Monitor level

Parameters

ipv6-source-address: Specifies an IPv6 multicast source.

prefix-length: Prefix length of the specified IPv6 multicast source or IPv6 multicast group address. For an IPv6 multicast source address, this argument has an effective value range of 0 to 128; for an IPv6 multicast group address, it has an effective value range of 8 to 128. The system default is 128 in both cases.

Ipv6-group-address: Specifies an IPv6 multicast group.

Description

Use the display mld routing-table command to view the information of the MLD routing table.

Examples

# View the information of the MLD routing table.

<Sysname> display mld routing-table

Routing table

 Total 1 entry

 

 00001. (*, FF1E::101:101)

       List of 1 downstream interface

        Vlan-interface2 (FE80::200:5EFF:FE71:3800),

                   Protocol: MLD

Table 1-10 display mld routing-table command output description

Field	Description
00001	Sequence number of the (*, G) entry
(*, FF1E::101:101)	An (*, G) entry in the MLD routing table
List of 1 downstream interface	List of downstream interfaces, namely the interfaces to which the multicast data for this group be forwarded
Protocol	Protocol type

 

1.1.6  last-listener-query-interval

 Syntax

last-listener-query-interval interval

undo last-listener-query-interval

View

MLD view

Default Level

2: System level

Parameters

interval: MLD last listener query interval, in seconds.

Description

Use the last-listener-query-interval command to configure the MLD last listener query interval globally.

Use the undo last-listener-query-interval command to restore the system default.

By default, the last listener query interval is 1 second.

Related commands: mld last-listener-query-interval, robust-count, display mld interface.

Examples

# Set the MLD last listener query interval to 3 seconds globally.

<Sysname> system-view

[Sysname] mld

[Sysname-mld] lastlistener-queryinterval 3

1.1.7  max-response-time

Syntax

max-response-time interval

undo max-response-time

View

MLD view

Default Level

2: System level

Parameters

interval: Maximum response delay for MLD general query messages, in seconds.

Description

Use the max-response-time command to configure the maximum response delay for general queries globally.

Use the undo max-response-time command to restore the system default.

By default, the maximum response delay for general queries is 10 seconds.

Related commands: mld max-response-time, timer other-querier-present, display mld interface.

Examples

# Set the maximum response delay for MLD general queries to 8 seconds globally.

<Sysname> system-view

[Sysname] mld

[Sysname-mld] max-response-time 8

1.1.8  mld

Syntax

mld

undo mld

View

System view

Default Level

2: System level

Parameters

None

Description

Use the mld command to enter MLD view.

Use the undo mld command to remove the configurations made in MLD view.

This command can take effect only after IPv6 multicast routing is enabled on the device.

Related commands: multicast ipv6 routing-enable.

Examples

# Enter MLD view.

<Sysname> system-view

[Sysname] multicast ipv6 routing-enable

[Sysname] mld

[Sysname-mld]

1.1.9  mld enable

Syntax

mld enable

undo mld enable

View

VLAN interface view

Default Level

2: System level

Parameters

None

Description

Use the mld enable command to enable MLD on the current interface.

Use the undo mld enable command to disable MLD on the current interface.

By default, MLD is  disabled on the interface.

Note that:

l           This command can take effect only after IPv6 multicast routing is enabled on the device.

l           Other MLD configurations performed on the interface can take effect only after MLD is enabled on the interface.

l           After MLD is enabled on a VLAN interface, it is not allowed to enable MLD Snooping in the corresponding VLAN, and vice versa.

Related commands: mld.

Examples

# Enable MLD on VLAN-interface 100.

<Sysname> system-view

[Sysname] multicast ipv6 routing-enable

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] mld enable

1.1.10  mld last-listener-query-interval

Syntax

mld last-listener-query-interval interval

undo mld last-listener-query-interval

View

VLAN interface view

Default Level

2: System level

Parameters

interval: MLD last listener query interval, in seconds.

Description

Use the mld last-listener-query-interval command to configure the MLD last listener query interval.

Use the undo mld last-listener-query-interval command to restore the system default.

By default, the MLD last listener query interval is 1 second.

Related commands: last-listener-query-interval, mld robust-count, display mld interface.

Examples

# Set the MLD last listener query interval to 3 on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] mld last-listener-query-interval 3

1.1.11  mld max-response-time

Syntax

mld max-response-time interval

undo mld max-response-time

View

VLAN interface view

Default Level

2: System level

Parameters

interval: Maximum response delay for MLD general query messages, in seconds.

Description

Use the mld max-response-time command to configure the maximum response delay for MLD general query messages on the current interface.

Use the undo mld max-response-time command to restore the system default.

By default, the maximum response delay for MLD general query messages is 10 seconds.

The maximum query response delay determines how long it takes the device to find whether any group member exists on the local subnet.

Related commands: max-response-time, mld timer other-querier-present, display mld interface

Examples

# Set the maximum response delay for MLD general query messages to 8 seconds on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] mld max-response-time 8

1.1.12  mld require-router-alert

Syntax

mld require-router-alert

undo mld require-router-alert

View

VLAN interface view

Default Level

2: System level

Parameters

None

Description

Use the mld require-router-alert command to configure the interface to discard MLD messages without the Router-Alert option.

Use the undo mld require-router-alert command to restore the default configuration.

By default, the device does not check the Router-Alert option, that is, it sends all the received MLD messages to the upper-layer protocol for processing no matter whether they have the Router-Alert option.

Related commands: require-router-alert, mld send-router-alert.

Examples

# Configure VLAN-interface 100 to discard MLD messages without the Router-Alert option.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] mld require-router-alert

1.1.13  mld robust-count

Syntax

mld robust-count robust-value

undo mld robust-count

View

VLAN interface view

Default Level

2: System level

Parameters

robust-value: MLD querier robustness variable.

Description

Use the mld robust-count command to configure the MLD querier robustness variable.

Use the undo mld robust-count command to restore the system default.

By default, the MLD querier robustness variable is 2.

Related commands: robust-count, mld timer query, mld last-listener-query-interval, mld timer other-querier-present, display mld interface.

Examples

# Set the MLD querier robustness variable to 3 on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] mld robust-count 3

1.1.14  mld send-router-alert

Syntax

mld send-router-alert

undo mld send-router-alert

View

VLAN interface view

Default Level

2: System level

Parameters

None

Description

Use the mld send-router-alert command to enable insertion of the Router-Alert option into MLD messages to be sent from the current interface.

Use the undo mld send-router-alert command to disable insertion of the Router-Alert option into MLD messages to be sent from the current interface.

By default, MLD messages carry the Router-Alert option.

Related commands: send-router-alert, mld require-router-alert.

Examples

# Configure VLAN-interface 100 to sent MLD messages without the Router-Alert option .

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] undo mld send-router-alert

1.1.15  mld timer other-querier-present

Syntax

mld timer other-querier-present interval

undo mld timer other-querier-present

View

VLAN interface view

Default Level

2: System level

Parameters

interval: Other querier present interval in seconds.

Description

Use the mld timer other-querier-present command to configure the other querier present interval on the current interface.

Use the undo mld timer other-querier-present command to restore the default configuration.

By default, the other querier present interval is determined by the following formula:

MLD other querier present interval = [ MLD query interval ] times [ MLD querier robustness variable ] plus [ maximum response delay for MLD general queries ] divided by two.

 

 

Related commands: timer other-querier-present, mld timer query, mld robust-count, mld max-response-time, display mld interface.

Examples

# Set the other querier present interval to 200 seconds on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface100

[Sysname-Vlan-interface100] mld timer other-querier-present 200

1.1.16  mld timer query

Syntax

mld timer query interval

undo mld timer query

View

VLAN interface view

Default Level

2: System level

Parameters

interval: MLD query interval, namely the amount of time in seconds between MLD general queries.

Description

Use the mld timer query command to configure the MLD query interval on the current interface.

Use the undo mld timer query command to restore the system default.

By default, the query interval is 125 seconds.

The device sends MLD general queries at a configurable interval so as to determine whether any IPv6 multicast group member exist on the local subnet. The administrator can modify this query interval as required based on the actual networking situation.

Related commands: timer query, mld timer other-querier-present, display mld interface.

Examples

# Set the query interval to 200 seconds on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] mld timer query 200

1.1.17  mld version

Syntax

mld version version-number

undo mld version

View

VLAN interface view

Default Level

2: System level

Parameters

version-number: MLD version.

Description

Use the mld version command to configure the MLD version on the current interface.

Use the undo mld version command to restore the default MLD version.

By default, the MLD version is MLDv1.

Related commands: version.

Examples

# Set the MLD version to version 2 on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] mld version 2

1.1.18  require-router-alert

Syntax

require-router-alert

undo require-router-alert

View

MLD view

Default Level

2: System level

Parameters

None

Description

Use the require-router-alert command to globally configure the device to discard MLD messages without the Router-Alert option.

Use the undo require-router-alert command to restore the default configuration.

By default, the device does not check the Router-Alert option, that is, it forwards all received MLD messages to the upper layer protocol for processing.

Related commands: mld require-router-alert, send-router-alert.

Examples

# Globally configure the device to discard MLD messages without the Router-Alert option.

<Sysname> system-view

[Sysname] mld

[Sysname-mld] require-router-alert

1.1.19  reset mld group

Syntax

reset mld group { all | interface interface-type interface-number { all | ipv6-group-address [ prefix-length ] [ ipv6-source-address [ prefix-length ] ] } }

View

User view

Default Level

2: System level

Parameters

all: The first all specifies to clear MLD multicast group information on all interfaces, while the second all specifies to clear the information of all MLD multicast groups.

interface interface-type interface-number: Specifies an interface by its type and number. At present, only VLAN interfaces are supported for the S9500 series switches.

ipv6-group-address: Specifies an IPv6 multicast group.

ipv6-source-address: Specifies an IPv6 multicast source.

prefix-length: Prefix length of the specified IPv6 multicast source or IPv6 multicast group. For a multicast source address, this argument has an effective value range of 0 to 128; for an IPv6 multicast group address, it has an effective value range of 8 to 128. The system default is 128 in both cases.

Description

Use the reset mld group command to clear MLD multicast group information.

Note that:

l           This command cannot clear the information about MLD multicast groups of static joins.

l           Using the reset mld group command may cause currently active receivers to stop receiving multicast information.

Related commands: display mld group.

Examples

# Clear all MLD multicast group information.

<Sysname> reset mld group all

# Clear all MLD multicast group information on VLAN-interface 100.

<Sysname> reset mld group interface vlan-interface 100 all

# Clear MLD multicast group information for IPv6 multicast group FF1E::101:101 on VLAN-interface 100.

<Sysname> reset mld group interface vlan-interface ff1e::101:101

1.1.20  robust-count

Syntax

robust-count robust-value

undo robust-count

View

MLD view

Default Level

2: System level

Parameters

robust-value: MLD querier robustness variable.

Description

Use the robust-count command to configure the MLD querier robustness variable globally.

Use the undo robust-count command to restore the system default.

By default, the MLD querier robustness variable is 2.

Related commands: mld robust-count, last-listener-query-interval, timer query, timer other-querier-present, display mld interface.

Examples

# Set the MLD querier robustness variable to 3 globally.

<Sysname> system-view

[Sysname] mld

[Sysname-mld] robust-count 3

1.1.21  send-router-alert

Syntax

send-router-alert

undo send-router-alert

View

MLD view

Default Level

2: System level

Parameters

None

Description

Use the send-router-alert command to globally enable the insertion of the Router-Alert option into MLD messages to be sent.

Use the undo send-router-alert command to globally disable the insertion of the Router-Alert option into MLD messages to be sent.

By default, MLD messages carry the Router-Alert option.

Related commands: mld send-router-alert, require-router-alert.

Examples

# Globally disable insertion of the Router-Alert option into MLD messages to be sent.

<Sysname> system-view

[Sysname] mld

[Sysname-mld] undo send-router-alert

1.1.22  timer other-querier-present

Syntax

timer other-querier-present interval

undo timer other-querier-present

View

MLD view

Default Level

2: System level

Parameters

interval: Other querier present interval in seconds.

Description

Use the timer other-querier-present command to configure the other querier present interval globally.

Use the undo timer other-querier-present command to restore the system default.

By default, the other querier present interval is determined by the following formula:

MLD other querier present interval = [ MLD query interval ] times [ MLD querier robustness variable ] plus [ maximum response delay for MLD general queries ] divided by two.

 

 

Related commands: mld timer other-querier-present, timer query, robust-count, max-response-time, display mld interface.

Examples

# Globally set the timeout time for non-queriers to 200 seconds.

<Sysname> system-view

[Sysname] mld

[Sysname-mld] timer other-querier-present 200

1.1.23  timer query

Syntax

timer query interval

undo timer query

View

MLD view

Default Level

2: System level

Parameters

interval: Query interval, namely, amount of time in seconds between MLD general query messages.

Description

Use the timer query command to configure the query interval globally.

Use the undo timer query command to restore the system default.

By default, the query interval is 125 seconds.

Related commands: mld timer query, timer other-querier-present, display mld interface.

Examples

# Set the query interval to 200 seconds globally.

<Sysname> system-view

[Sysname] mld

[Sysname-mld] timer query 200

1.1.24  version

Syntax

version version-number

undo version

View

MLD view

Default Level

2: System level

Parameters

version-number: MLD version number.

Description

Use the version command to configure the MLD version globally.

Use the undo version command to restore the default MLD version.

By default, the MLD version is version 1.

Related commands: mld version.

Examples

# Set the MLD version to MLDv2 globally .

<Sysname> system-view

[Sysname] mld

[Sysname-mld] version 2