3Com Switch 8800 Advanced Software V5 Configuration Guide

Displaying and Maintaining MLD Configuration 645
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About other querier present interval:
■ If not configured manually, the other querier present interval is determined by
the formula: [ Other querier present interval (in seconds) ] = [ MLD query
interval ] times [ robustness variable ] plus [ maximum response delay ] divided
by two. By default, the values of these three parameters are 125, 2 and 10,
respectively, so the default other querier present interval = 125 x 2 + 10 / 2 =
255 (seconds).
■ If manually configured, the other querier present interval takes the configured
value.
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CAUTION:
■ If the configured other querier present interval is less than the query interval,
the state of the MLD querier may frequently change.
■ Make sure that the maximum response delay of MLD general query messages
is less than the last listener query interval (namely, the maximum response
delay of MLD multicast-address-specific query messages). Otherwise, multicast
group members may be wrongly removed.
Displaying and
Maintaining MLD
Configuration
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CAUTION: The reset mld group command cause an interruption of receivers’
reception of multicast data.
Configure the maximum
response delay for MLD
general query messages
mld max-response-time
interval
Optional
10 seconds by default
Configure the last listener
query interval
mld
lastlistener-queryinterval
interval
Optional
1 second by default
Configure the last listener
query count
mld robust-count
robust-value
Optional
2 times by default
Configure the other querier
present interval
mld timer
other-querier-present
interval
Optional
For the default, see Note
below.
To do... Use the command... Remarks
To do... Use the command...
Display information of IPv6
multicast groups
display mld group [ ipv6-group-address | interface
interface-type interface-number ] [ static | verbose ]
Display MLD layer 2 port
information
display mld group port-info [ vlan vlan-id ] [ slot
slot-id ] [ verbose ]
Display MLD configuration and
running information on the
specified interface or all
MLD-enabled interfaces
display mld interface [ interface-type interface-number
] [ verbose ]
Display the information of the MLD
routing table
display mld routing-table [ ipv6-source-address [
prefix-length ] | ipv6-group-address [ prefix-length ] ] *
Clear MLD forwarding entries reset mld group { all | interface interface-type
interface-number { all | ipv6-group-address [
prefix-length ] [ ipv6-source-address [ prefix-length ] ] } }