HP 11i User Manual download pdf (Page 34)

Conﬁguring mrouted

How to Conﬁgure mrouted

Chapter 234

The TTL value of forwarded packets is only compared with the

threshold value; it is not decremented by the threshold. An

application that initiates the IP multicast datagram sets the TTL, and

typically represents the number of subnets, or hops, the datagram has to

traverse to reach its destination. Every time a multicast datagram

passes through a multicast router, the TTL value is decremented by 1.

HP recommends that you use the default threshold value unless you

have a speciﬁc reason to set it otherwise.

In general, all interfaces connected to a particular subnet or tunnel

should use the same metric and threshold values for that subnet or

tunnel.

You can use the rate_limit option to specify a certain bandwidth in

Kbits/second which is allocated to multicast trafﬁc. The default value is

500Kbps on tunnels and 0 (unlimited) on physical interfaces.

You can use the boundary option to conﬁgure an interface as an

administrative boundary for the speciﬁed

boundary-name

scoped-addr

(scoped address). You can specify more than one boundary

option in the phyint and tunnel commands. Packets belonging to the

scoped address, which is an IP multicast group address, are not

forwarded on this interface.

mask-len

indicates the number of leading

1s in the mask applied (by means of a bitwise logically AND operation) to

the scoped address. For example, the statement boundary

239.2.3.3/16 would result in the mask 255.255.0.0 being calculated by

means of an AND operation with 239.2.3.3 to isolate the ﬁrst two octets,

239.2, of the scoped address. Therefore, all IP multicast addresses

beginning with 239.2 will not be forwarded on the speciﬁed interface.

The primary use of the boundary option is to allow concurrent use of the

same IP multicast addresses on downstream subnets, without

interfering with multicast broadcasts using the same IP multicast

addresses on subnets that are upstream from the mrouted gateway.

The cache_lifetime value determines the amount of time that a cached

multicast route remains in the kernel before timing out. This value is

speciﬁed in seconds and must be between 300 (5 minutes) and 86400 (24

hours). The default value is 300.

You can use the pruning off command to explicitly conﬁgure mrouted

as a nonpruning router. When pruning is off, IP multicast datagrams

are forwarded to leaf subnets of the broadcast routing tree even when

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