Nortel Optivity Switch, Using Manual

Page: 143 / 192

Chapter 6 Using Multicast Manager 143
Using Optivity Switch Manager, Release 1.1.0.0
Table 45 Interface tab fields
Field Description
Interface Interface on which IGMP is enabled.
QueryInterval(sec) Frequency (in seconds) at which IGMP host query packets
are transmitted on the interface. The range is from 1 to
65535. The default is 125.
Status IGMP row status. When an interface has been assigned an
IP address and DVMRP is enabled, status is shown as
active. Otherwise, it is shown as notInService.
Version Version of IGMP that is configured on the interface. For
IGMP to function correctly, all routers on a LAN must be
configured to run the same version of IGMP on that LAN.
Querier Address of the IGMP querier on the IP subnet to which the
interface is attached.
QueryMax
ResponseTime(sec) Maximum response time (in seconds) advertised in
IGMPv2 general queries on this interface. Smaller values
allow a router to prune groups faster. This value for
IGMPv1 is not configurable and has a default value of 10
seconds.
WrongVersion
Queries Number of queries received with an IGMP version that
does not match the interface. IGMP requires that all routers
on a LAN be configured to run the same version of IGMP. If
any queries are received with the wrong version, it
indicates a version mismatch.
Joins Number of times a group membership has been added on
this interface; that is, the number of times an entry for this
interface has been added to the cache table. This number
gives an indication of the amount of IGMP activity over
time.
Robustness This value is equal to the number of expected query packet
losses per serial query interval, plus 1. If a network is
expected to lose query packets, increase the robustness
value. The range is from 2 to 255 with a default value of 2.
The default value of 2 means that one query per query
interval may be dropped without the querier aging out.
LastMemQueryIntval Maximum response time inserted into group-specific
queries sent in response to leave group messages; also
the time between group-specific query messages.
Increasing this parameter increases the time before aging
hosts on the network. It also increases the number of
retransmits of group-specific queries. The range is from 1
to 255. The default value is 1.