Users Guide

Table Of Contents
In VLT deployments, Dell Technologies recommends not to change the PIM designated router by configuring a non-default
value using the ip pim dr-priority command.
In large-scale multicast deployments, you might see frequent bursts of multicast control traffic. For such deployments, Dell
Technologies recommends that you increase the burst size for queue 2 on all PIM routers using control-plane policing. For
more information about how to configure a QoS policy to rate limit control-plane traffic, see Configure control-plane policing.
Example: Spanned L3 VLAN IIF using PIM-SM
This section describes how to configure VLT multicast routing in a four-node setupcore, AG1, AG2, and ToRusing the
topology shown in the following figure:
Core, AG1, and AG2 are multicast routers in a VLT domain.
ToR is an IGMP-enabled L2 switch.
OSPF is the unicast routing protocol.
Sample configuration on core:
core# configure terminal
core(config)# ip multicast-routing
core(config)# ip pim rp-address 103.0.0.3 group-address 224.0.0.0/4
core(config)# router ospf 100
core(config-router-ospf-100)# exit
core(config)# interface ethernet 1/1/32:1
core(conf-if-eth1/1/32:1)# no shutdown
core(conf-if-eth1/1/32:1)# no switchport
core(conf-if-eth1/1/32:1)# ip address 16.0.0.1/24
core(conf-if-eth1/1/32:1)# flowcontrol receive off
core(conf-if-eth1/1/32:1)# ip pim sparse-mode
core(conf-if-eth1/1/32:1)# ip ospf 100 area 0.0.0.0
core(conf-if-eth1/1/32:1)# exit
core(config)# interface vlan 12
core(conf-if-vl-12)# no shutdown
core(conf-if-vl-12)# ip address 12.0.0.3/24
core(conf-if-vl-12)# ip pim sparse-mode
core(conf-if-vl-12)# ip pim dr-priority 1000
core(conf-if-vl-12)# ip ospf 100 area 0.0.0.0
Multicast
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