Juniper JUNOSE 11.1.X MULTICAST ROUTING, Руководство по настройке

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Table 6: Sample Routing Table for a DVMRP Router (continued)
Output
Port Input
Port
Time Before
Entry Is Deleted
from Routing
Table
Metric From Router Subnet Mask
Source
Subnet
4/0, 4/1 3/1 80 2 143.2.55.23 255.255.0.0 143.3.0.0
4/0, 4/1 3/1 120 3 143.78.6.43 255.255.0.0 143.4.0.0
The DVMRP router maintains an (S,G) pair table that provides information to the
multicast forwarding table. The (S,G) pair table is based on:
■
Information from the DVMRP routing table
■
Information learned from prune messages
■
If IGMP and DVMRP are on the same interface, group information learned from
IGMP
The (S,G) pair table includes a route from each subnetwork that contains a source to
each multicast group of which that source is a member. These routes can be static
or learned routes. Table 7 on page 127 shows an example of the (S,G) pair table for
DVMRP. A dash (–) in the Input Port column indicates that the interface is associated
with a protocol other than DVMRP.
Table 7: Sample DVMRP (S,G) Pair Table
Output Port Input Port
Time Before Entry Is
Deleted from Routing Table Multicast
Group Source
Subnet
4/0, 4/1 3/0 85 230.1.2.3 143.2.0.0
4/0, 4/1 3/0 75 230.2.3.4
4/1 3/0 60 230.3.4.5
4/0 — 90 230.4.5.6
4/0, 4/1 3/1 80 230.1.2.3 143.3.0.0
Platform Considerations
For information about modules that support DVMRP on the ERX7xx models, ERX14xx
models, and the ERX310 Broadband Services Router:
■
See ERX Module Guide, Table 1, Module Combinations for detailed module
specifications.
■
See ERX Module Guide, Appendix A, Module Protocol Support for information about
the modules that support DVMRP.
Platform Considerations
■ 127
Chapter 4: Configuring DVMRP