848 Configuring Routing Interfaces
Default Routing Interface Values
By default, no routing interfaces are configured. 
When you create a VLAN, no IP address is configured, and DHCP is disabled. 
After you configure an IP address on a VLAN or loopback interface, routing is 
automatically enabled on the VLAN interface, and the interface has the 
default configuration shown in Table 30-1.
Most interface configuration parameters are not applicable to loopback 
interfaces, so you cannot change the default values. However, when you create 
a loopback interface, the default values are similar to those of VLAN routing 
interfaces, as Table 30-1 shows.
When you create a tunnel, it has the default values shown in Table 30-2
Table 30-1. VLAN Routing Interface and Loopback Interface Defaults
Parameter Default Value
Forward Net Directed Broadcasts Disabled
Encapsulation Type Ethernet (N/A for loopbacks)
Proxy Arp Enabled
Local Proxy Arp Disabled
IP MTU 1500
Bandwidth Not configured.
Destination Unreachables Enabled
ICMP Redirects Enabled
Table 30-2. Tunnel Interface Defaults
Parameter Default Value
Tunnel mode 6-in-4 configured
Link Local Only Mode Disabled
Source address None
Destination address 0.0.0.0