Configuration Guide User guide

FastIron Configuration Guide 1519
53-1002494-02
Global IP multicast parameters
Defining the maximum number of PIM cache entries
The PIM cache system parameter defines the maximum number of repeated PIM traffic being sent
from the same source address and being received by the same destination address. To define this
maximum, enter the system-max pim-mcache <num> command.
Brocade(config)#system-max pim-mcache 999
Syntax: system-max pim-mcache <num>
The <num> parameter specifies the maximum number of multicast cache entries for PIM. Enter a
number from 256 – 4096. The default is 1024.
Changing IGMP V1 and V2 parameters
IGMP allows Brocade routers to limit the multicast of IGMP packets to only those ports on the
router that are identified as IP Multicast members. This section applies to Brocade devices that
support IGMP versions 1 and 2.
The router actively sends out host queries to identify IP Multicast groups on the network, inserts
the group information in an IGMP packet, and forwards the packet to IP Multicast neighbors.
The following IGMP V1 and V2 parameters apply to PIM and DVMRP:
• IGMP query interval – Specifies how often the Layer 3 switch queries an interface for group
membership.
• IGMP group membership time – Specifies how many seconds an IP Multicast group can remain
on a Layer 3 switch interface in the absence of a group report.
• IGMP maximum response time – Specifies how many seconds the Layer 3 switch will wait for
an IGMP response from an interface before concluding that the group member on that
interface is down and then removing the interface from the group.
To change these parameters, you must first enable IP multicast routing by entering the ip
multicast-routing command at the global CLI level.
Brocade(config)#ip multicast-routing
Syntax: [no] ip multicast-routing
NOTE
You must enter the ip multicast-routing command before changing the global IP Multicast
parameters. Otherwise, the changes do not take effect and the software uses the default values.
Modifying IGMP (V1 and V2) query interval period
The IGMP query interval period defines how often a router will query an interface for group
membership.
To modify the default value for the IGMP (V1 and V2) query interval, enter the ip igmp query-interval
<num> command.
Brocade(config)#ip igmp query-interval 120
Syntax: ip igmp query-interval <num>
The <num> variable specifies the IGMP query interval in number of seconds. Enter a value from 10
through 3600. The default value is 125.