Configure IP Routing Globally or for a VRF
Configure the IP routing protocol stack to specify which routing features the device can use. You can configure global parameters before or after you configure the routing protocols.
About this task
To configure IP routing globally for a VRF instance, use VRF Router Configuration mode rather than Global Configuration mode.
Procedure
Variable Definitions
The following table defines parameters for the ip command.
Variable |
Value |
---|---|
alternative-route |
Enables or disables the alternative route feature. The default value is enabled. If the alternative-route parameter is disabled, all existing alternative routes are removed. After you enable the parameter, all alternative routes are readded. |
max-routes-trap enable |
Enables the device to send a trap after the maximum number of routes is exceeded. |
more-specific-non-local-route |
Enables the more-specific-non-local-route feature. If enabled, the device can enter a more-specific nonlocal route into the routing table. The default is disabled. |
routing |
Enables routing. You cannot enable IP routing on a DvR Leaf node. |
supernet |
Enables or disables supernetting. If you globally enable supernetting, the device can learn routes with a route mask of less then eight bits. Routes with a mask length less than eight bits cannot have ECMP paths, even if the ECMP feature is globally enabled. The default is disabled. |
ttl <1-255> |
Configures the default time-to-live (TTL) value for a routed packet. The TTL is the maximum number of seconds before a packet is discarded. The default value of 255 is used whenever a time is not supplied in the datagram header. |
The following table defines parameters for the ip icmp commands.
Variable |
Value |
---|---|
unreachable |
Enables the device to send ICMP unreachable messages. When enabled, this variable generates Internet Control Message Protocol (ICMP) network unreachable messages if the destination network is not reachable from this router. These messages help determine if the device is reachable over the network. The default is disabled. |