Configuring Dvmrp Summary Addresses - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - MULTICAST ROUTING CONFIGURATION GUIDE 2010-10-07 Configuration Manual

Configuring DVMRP Summary Addresses

ip dvmrp auto-summary
ip dvmrp summary-address
Copyright © 2010, Juniper Networks, Inc.
You can configure an interface to advertise a summary address with a known metric
rather than a more specific route. DVMRP advertises the summary address if the DVMRP
routing table contains a more specific route that matches the address and mask of the
summary address.
If you want to advertise all routes rather than a summary, disable automatic
summarization on the interface (no ip dvmrp auto-summary). By default, the router
automatically summarizes DVMRP routes. DVMRP automatic summarization maps a
unicast subnet route to a classful network number route when the subnet has a different
network number from the IP address of the interface (or tunnel) over which the
advertisement travels. If the interface is unnumbered, the router compares the network
number of the numbered interface to the IP address to which the unnumbered interface
points.
If you configure a summary address on an interface and do not disable automatic
summarization, the interface advertises the least-specific address.
Use to reenable the router to summarize routes automatically for this interface. By
default, automatic summarization is enabled.
Example
host1:boston(config-if)#ip dvmrp auto-summary
Use the no version to disable automatic summarization for this interface.
See ip dvmrp auto-summary.
Use to advertise DVMRP summary addresses on an interface. By default, an interface
advertises only summary addresses generated by automatic summarization.
If you configure multiple overlapping summary addresses on an interface, the one with
the shortest mask takes preference.
Use the metric keyword to specify a DVMRP metric (hop count); the default metric
value is 1.
Example
host1:boston(config-if)#ip dvmrp summary-address 192.48.1.2 255.255.255.0 metric
1
Use the no version to stop advertising a summary address on the interface.
See ip dvmrp summary-address.
Chapter 4: Configuring DVMRP
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