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PIM Passive
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:
Brocade# config term
Brocade(config)#router pim
Brocade(config-pim-router)#exit
Brocade(config)#interface ethernet 2
Brocade(config-if-e1000-2)#ip pim
Brocade(config-if-e1000-2)#ip pim passive
Brocade(config-if-e1000-2)#exit
Brocade(config)#interface ve 2
Brocade(config-vif-2)#ip pim-sparse
Brocade(config-vif-2)#ip pim passive
Brocade(config-vif-2)#exit
Syntax: [no] ip pim passive3
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.
92 FastIron Ethernet Switch IP Multicast Configuration Guide
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