Configuration Guide User guide

1558 FastIron Configuration Guide
53-1002494-02
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:
Syntax: [no] ip pim passive3
Multicast Source Discovery Protocol (MSDP)
The Multicast Source Discovery Protocol (MSDP) is used by Protocol Independent Multicast (PIM)
Sparse routers to exchange routing information for PIM Sparse multicast groups across PIM Sparse
domains. Routers running MSDP can discover PIM Sparse sources that are in other PIM Sparse
domains.
NOTE
MSDP is not supported on FCX and ICX platforms.
PIM Sparse routers use MSDP to register PIM Sparse multicast sources in a domain with the
Rendezvous Point (RP) for that domain.
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