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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 48 Configuring IP Multicast Routing
Configuring Advanced DVMRP Interoperability Features
Controlling Route Exchanges
These sections describe how to tune the Cisco device advertisements of DVMRP routes:
• Limiting the Number of DVMRP Routes Advertised, page 48-58 (optional)
• Changing the DVMRP Route Threshold, page 48-58 (optional)
• Configuring a DVMRP Summary Address, page 48-59 (optional)
• Disabling DVMRP Autosummarization, page 48-61 (optional)
• Adding a Metric Offset to the DVMRP Route, page 48-61 (optional)
Limiting the Number of DVMRP Routes Advertised
By default, only 7000 DVMRP routes are advertised over an interface enabled to run DVMRP (that is,
a DVMRP tunnel, an interface where a DVMRP neighbor has been discovered, or an interface configured
to run the ip dvmrp unicast-routing interface configuration command).
Beginning in privileged EXEC mode, follow these steps to change the DVMRP route limit. This
p
rocedure is optional.
To configure no route limit, use the no ip d
vmrp route-limit global configuration command.
Changing the DVMRP Route Threshold
By default, 10,000 DVMRP routes can be received per interface within a 1-minute interval. When that
rate is exceeded, a syslog message is issued, warning that there might be a route surge occurring. The
warning is typically used to quickly detect when devices have been misconfigured to inject a large
number of routes into the MBONE.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip dvmrp route-limit count Change the number of DVMRP routes advertised over an interface
enabled for DVMRP.
This command prevents misconfigured i
p dvmrp metric interface
configuration commands from causing massive route injection into the
MBONE.
By default, 7000 routes are advertised. The range is 0 to 4294967295.
Step 3
end Return to privileged EXEC mode.
Step 4
show running-config Verify your entries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.