Cisco Systems 78-11741-02 Administratively Scoped Boundary Example, IP Multicast Helper Example

Configuring IP Multicast Routing

IP Multicast Configuration Examples

atm nsap-address 47.00918100000000410B0A1981.333333333333.00 atm pvc 1 0 5 qsaal

atm pvc 2 0 16 ilmi

atm multipoint-signalling map-group mpvc

router ospf 9

network 171.69.214.0 0.0.0.255 area 0

!

ip classless

ip pim rp-address 171.69.10.13 98

!

map-list mpvc

ip 171.69.214.41 atm-nsap 47.00918100000000410B0A1981.111111111111.00 broadcast ip 171.69.214.42 atm-nsap 47.00918100000000410B0A1981.222222222222.00 broadcast ip 171.69.214.43 atm-nsap 47.00918100000000410B0A1981.333333333333.00 broadcast

Administratively Scoped Boundary Example

The following example shows how to set up a boundary for all administratively scoped addresses:

access-list 1 deny 239.0.0.0 0.255.255.255 access-list 1 permit 224.0.0.0 15.255.255.255 interface ethernet 0

ip multicast boundary 1

IP Multicast Helper Example

Figure 73 illustrates how a helper address on two routers converts from broadcast to multicast and back to broadcast.

Figure 73			IP Multicast Helper Scenario
						IP multicast network cloud
	Broadcast				Router A		Router C
		traffic
				Ethernet 0		Ethernet 1	Last hop
					First hop
					router		router

Broadcast-only

LAN or internet

Router B

178.21.34.0Client

		UDP
		port 4000
Ethernet 2			178.21.34.15
Broadcast				Client
	traffic
	Broadcast-only				43282

LAN or internet

The configuration on the first hop router converts a broadcast stream arriving at incoming Ethernet interface 0 destined for UDP port 4000 to a multicast stream. The access list denies other traffic from being forwarded into the multicast cloud. The traffic is sent to group address 224.5.5.5. Because fast switching does not perform such a conversion, the ip forward-protocolglobal configuration command causes the proper process level to perform the conversion.

The second configuration on the last hop router converts the multicast stream at Ethernet interface 2 back to broadcast. Again, all multicast traffic emerging from the multicast cloud should not be converted to broadcast, only the traffic destined for UDP port 4000.

Cisco IOS IP Configuration Guide

IPC-455