HP ProCurve 6200yl Multicast And Routing Manual page 70

PIM-DM (Dense Mode)
Configuring PIM-DM
Note the common subnet
instance in (multinetted)
VLAN 25 (10.38.10.x).
5400zl #3
VLAN 25
10.38.10.3
10.38.30.1
10.38.31.1
VLAN 28
10.28.30.1
VLAN 30
10.30.229.2
Downstream
Routers
Figure 3-4. Example of a Multicast Network with a Multinetted VLAN
3-20
5400zl #1
Video
Server
VLAN 25
10.38.10.1
10.38.11.1
10.38.12.1
VLAN 27
10.27.30.1
VLAN 29
10.29.30.1
Downstream
Routers
Figure 3-5 illustrates the steps for configuring multicast routing at the VLAN
level for the Series 5400zl #1 switch shown in figure 3-4.
ProCurve(config)# vlan 25
ProCurve(vlan-25)# ip igmp
ProCurve(vlan-25)# ip rip
ProCurve(vlan-25)# ip pim-dense ip-addr 10.38.10.1
ProCurve(vlan-25-pim-dense)# vlan 27
ProCurve(vlan-27)# ip igmp
ProCurve(vlan-27)# ip rip
ProCurve(vlan-27)# ip pim-dense
ProCurve(vlan-27-pim-dense)# vlan 29
ProCurve(vlan-29)# ip igmp
ProCurve(vlan-29)# ip rip
ProCurve(vlan-29)# ip pim-dense
ProCurve(vlan-29-pim-dense)# write mem
ProCurve(vlan-29-pim-dense)# exit
ProCurve(vlan-29)# exit
Figure 3-5. VLAN-Level Configuration Steps for PIM-DM on Routing Switch #1
5400zl #2
VLAN 25
10.38.10.2
10.38.20.1
10.38.21.1
VLAN 29
10.29.30.2
VLAN 30
10.30.229.1
On the three routing switches,
VLAN 25 is multinetted with
subnets that match in only one
instance. Since subnet 10.38.10.x
exists on VLAN 25 in all routing
switches, it serves as the source
IP address for multicast traffic
outbound on VLAN 25 for the
network.
The remaining VLANs (27, 28, 29,
and 30) in the network are not
multinetted on the routing
switches and it is not necessary
to configure a source address for
multicast routing on these other
VLANs.
In this example, the multicast
source transmits packets with a
TTL (time-to-live) of 192. To
prevent these packets from
moving beyond routers 2 and 3,
you would configure the TTL in
the downstream routers (below
routers 2 and 3) at 190. (It is not
necessary to configure the TTL on
routers 1 - 3.)