Tài liệu MULTICASTING pptx
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MULTICASTING
Key Commands Shows and Debugs
R1(config-if) ip igrp join-group 224.1.1.2
R1(config) ip multicast-routing
R1(config) ip cgmp
Then select multicast routing protocol:
For PIM dense mode:
R1(config-if) ip pim dense mode
Sparse mode:
R1(config-if) ip pim sparse-mode
R1(config) ip pim rp-address A.B.C.D
On Catalyst:
Set cgmp enable
Set cgmp multicast router <mod/port>
Show ip pim interface
Show ip pim neighbor
Show ip mroute
Show ip mroute summary
Show ip mroute count
Show ip mroute active
Show ip igmp group
Additional Commands
For PIM auto-rp, interface config:
ip pim send-rp-announce loopback 0 scope 16
ip pim send-rp-discovery scope 16
Where loopback 0 is the announcing interface, and
scope 16 is a TTL of 16 hops.
Rp filter: ip pim accept-rp A.B.C.D or group-list 10
Tunnel for multicast only:
Interface tunnel 0
Ip unnumbered ethernet 0
Ip pim sparse-mode
Tunnel source ethernet 0
Tunnel destination A.B.C.D
Tunnel mode DVMRP
Over NBMA:
(config-if) ip pim nbma-mode
Spot The Issue Notes
The two steps:
1. Define the ip multicast group to support in
your multicast routing with the interface
command: "ip igmp join-group 224.10.1.3"
2. Enable IP multicast routing in global
configuration mode and define which multicast
routing protocol to use. Choices are:
• MOSPF
• PIM
• DVMRP
Can PING the multicast address (ex 224.1.1.10) to
test multicast reacheability.
Can use multiple auto RP machines, but priority
goes to the highest advertised ip address (in the
case above, would be the ip address on loopback 0
