Cisco Systems 78-11741-02 Wireless Office Headset User Manual


 
Configuring DVMRP Interoperability
Advanced DVMRP Interoperability Configuration Task List
IPC-542
Cisco IOS IP Configuration Guide
Note At least one, more-specific route must be present in the unicast routing table before a configured
summary address will be advertised.
Disabling DVMRP Automatic summarization
By default, the Cisco IOS software performs some level of DVMRP summarization automatically.
Disable this function if you want to advertise all routes, not just a summary. If you configure the
ip dvmrp summary-address interface configuration command and did not configure the no ip dvmrp
auto-summary command, you get both custom and automatic summaries.
To disable DVMRP automatic summarization, use the following command in interface configuration
mode:
Adding a Metric Offset to the DVMRP Route
By default, the router increments by 1 the metric of a DVMRP route advertised in incoming DVMRP
reports. You can change the metric if you want to favor or not favor a certain route. The DVMRP metric
is a hop count. Therefore, a very slow serial line of one hop is preferred over a route that is two hops
over FDDI or another fast medium.
For example, perhaps a route is learned by Router A and the same route is learned by Router B with a
higher metric. If you want to use the path through Router B because it is a faster path, you can apply a
metric offset to the route learned by Router A to make it larger than the metric learned by Router B,
allowing you to choose the path through Router B.
To change the default metric, use the following command in interface configuration mode:
Similar to the metric keyword in mrouted configuration files, the following is true when using the
ip dvmrp metric-offset interface configuration command:
When you specify the in keywordor no keyword, the increment value is added to incoming DVMRP
reports and is reported in mrinfo replies. The default value for the in keyword is 1.
When you specify the out keyword, the increment is added to outgoing DVMRP reports for routes
from the DVMRP routing table. The default value for the out keyword is 0.
Command Purpose
Router(config-if)# ip dvmrp summary-address
summary-address mask [metric value]
Specifies a DVMRP summary address.
Command Purpose
Router(config-if)# no ip dvmrp auto-summary
Disables DVMRP automatic summarization.
Command Purpose
Router(config-if)# ip dvmrp metric-offset [in |
out] increment
Changes the metric added to DVMRP routes advertised in incoming
reports.