Brocade FastIron Ethernet Switch IP Multicast Configuration Guide - Manual (Page 104)

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PIM Passive
PIM Passive is used to reduce and minimize unnecessary PIM Hello and other PIM control messages.
PIM Passive allows you to specify that the interface is "passive" in regards to PIM. No PIM control
packets are sent or processed (if received), but hosts can still send and receive multicast traffic and
IGMP control traffic on that interface. Also, PIM Passive prevents any malicious router from taking
over as the designated router (DR), which can prevent all hosts on the LAN from joining multicast
traffic outside the LAN.
The following guidelines apply to PIM Passive:
1. This is a Layer 3 interface [Ethernet/Ve] level feature.
2. Since the loopback interfaces are never used to form PIM neighbors, this feature is not supported
on loopback interface.
3. Both PIM SM and PIM DM modes support this feature.
4. Applying the PIM Passive on an interface requires PIM to be enabled on that interface.
5. The sent and received statistics of a PIM Hello message are not changed for an interface, while it
is configured as PIM passive.
To enable PIM Passive on an interface, enter the following commands:
device# config term
device(config)#router pim
device(config-pim-router)#exit
device(config)#interface ethernet 2
device(config-if-e1000-2)#ip pim
device(config-if-e1000-2)#ip pim passive
device(config-if-e1000-2)#exit
device(config)#interface ve 2
device(config-vif-2)#ip pim-sparse
device(config-vif-2)#ip pim passive
device(config-vif-2)#exit
Syntax: [no] ip pim passive
Multicast Outgoing Interface (OIF) list optimization
Each multicast route entry maintains a list of outgoing interfaces (OIF List) to which an incoming
multicast data packet matching the route is replicated. In hardware-forwarded route entries, these OIF
lists are stored inside the hardware in replication tables which are limited in size. In many deployment
scenarios, more than one multicast route can have identical OIF lists and can optimize usage of the
replication table entries by sharing them across multiple multicast routes.
Multicast OIF list optimization keeps track of all the OIF lists in the system. It manages the hardware
replication resources optimally, in real time, by dynamically assigning or re-assigning resources to
multicast route entries to suit their current OIF list requirements, while maximizing resource sharing.
PIM Passive
102 FastIron Ethernet Switch IP Multicast Configuration Guide
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