Brocade FastIron Ethernet Switch IP Multicast Configuration Guide - Manual (Page 91)

Configuring a DR priority
The DR priority option lets you give preference to a particular device in the DR election process by
assigning it a numerically higher DR priority. This value can be set for IPv4 interfaces. To set a DR
priority higher than the default value of 1, use the ip pim dr-priority command as shown:
device(config-if-e10000-3/24)# ip pim dr-priority 50
Syntax: [no] ip pim dr-priority priority-value
The priority-value variable is the value that you want to set for the DR priority. Optional values are: 0 -
65535. The default value is 1.
The no option removes the command and sets the DR priority back to the default value of 1.
The following information may be useful for troubleshooting.
1. If more than one device has the same DR priority on a subnet (as in the case of default DR priority
on all), the device with the numerically highest IP address on that subnet is elected as the DR.
2. The DR priority information is used in the DR election ONLY IF ALL the PIM devices connected to
the subnet support the DR priority option. If there is at least one PIM device on the subnet that
does not support this option, then the DR election falls back to the backwards compatibility mode in
which the device with the numerically highest IP address on the subnet is declared the DR
regardless of the DR priority values.
Displaying basic PIM Dense configuration information
To display PIM Dense configuration information, enter the following command at any CLI level.
Device(config)# show ip pim dense
Global PIM Dense Mode Settings
Maximum Mcache : 12992 Current Count : 2
Hello interval : 30 Neighbor timeout : 105
Join/Prune interval : 60 Inactivity interval : 180
Hardware Drop Enabled : Yes Prune Wait Interval : 3
Graft Retransmit interval : 180 Prune Age : 180
Route Precedence : mc-non-default mc-default uc-non-default uc-default
Syntax: show ip pim [ vrf vrf-name ] dense
The vrf keyword allows you to display PIM dense configuration information for the VRF instance
identified by the vrf-name variable.
This display shows the following information.
Field Description
Maximum Mcache The maximum number multicast cache entries allowed on the device.
Current Count The number of multicast cache entries currently used.
Hello interval How frequently the device sends hello messages out the PIM dense interfaces.
Neighbor timeout The interval after which a PIM device will consider a neighbor to be absent.
Join/Prune interval How long a PIM device will maintain a prune state for a forwarding entry.
Configuring a DR priority
FastIron Ethernet Switch IP Multicast Configuration Guide 89
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