HP 5500 Ei 5500 Si Switch Series Configuration Guide

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Multicast data abnormally terminated on an intermediate router ··················\
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RPs cannot join SPT in PIM-SM ··················\
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RPT establishment failure or source  registration failure in PIM-SM ··················\
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Configuring MSDP (available only on the HP 5500...

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Configuring MBGP route preferences ··················\
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Configuring the defaul t local preference ··················\
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Configuring the  MED attribute ··················\
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Setting the maximum number of multicast groups that a port can join ··················\
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Enabling IPv6 multicast group replacement ··················\
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Setting the 802.1p preced ence for MLD messages ··················\
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Configuring an IPv6 multicast user control policy...

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Abnormal termination of IPv6 multicast data ··················\
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Configuring MLD (available  only on the HP 5500 EI) ··················\
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Overview  ··················\
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Enabling IPv6 PIM-DM ··················\
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Enabling state-refr esh capability ··················\
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Configuring state refresh parameters ··················\
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Configuring a preferred value for routes from a peer or a peer group ··················\
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Controlling route distribution and reception ··················\
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Configuration prerequisites ··················\
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Injecting a local IPv6...

1 
Multicast overview 
Introduction to multicast 
As a technique that coexists with unicast and broadcast, the multicast technique effectively addresses the 
issue of point-to-multipoint data transmission. By enabling high-efficiency point-to-multipoint data 
transmission over a network, multicast greatly saves network bandwidth and reduces network load. 
By using multicast technology, a network operator can easily provide new value-added services, such as 
live webcasting, web TV, distance learning,...

2 
In unicast transmission, the traffic transmitted over the network is proportional to the number of hosts that 
need the information. If a large number of hosts need the information, the information source must send 
a separate copy of the same information to each of these hosts. Sending many copies can place a 
tremendous pressure on the information source and the network bandwidth.  
Unicast is not suitable for batch transmission of information. 
Broadcast 
In broadcast transmission, the information...

3 
Figure 3 Multicast transmission 
 
 
T h e  m u l t i c a s t  s o u r c e  s e n d s  o n l y  o n e  c o p y  o f  t h e  i n f o r m a t i o n  t o  a  m u l t i c a s t  g r o u p.  H o s t  B ,  H o s t  D  a n d  H o s t  
E, which are receivers of the information, must join the multicast group. The routers on the network 
duplicate and forward the information based on the distribution of the group members. Finally, the 
information is correctly delivered to Host B, Host D, and Host E.  
To...

4 
For a better understanding of the multicast concept, you can compare multicast transmission to the 
transmission of TV programs.  
Table 1 Comparing TV transmission and multicast transmission 
TV transmission 
 Multicast transmission  
A TV station transmits a TV program through a 
channel.   A multicast source sends multicast data to a multicast 
group.  
A user tunes the TV set to the channel. 
A receiver joins the multicast group. 
The user starts to watch the TV program transmitted 
by the TV...