Chapter30 More About....
Reasons Why an Ethernet Interface Configuration May Be Read-Only
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Cisco Router and Security Device Manager Version 2.2 Users Guide
OL-4015-08
If the dial-on-demand option is configured on the pppoe-client command.
If there is more than 1 PVC configured on the interface.
If the encapsulation on the associated dialer is blank or is not ppp.
If no IP address is configured on the associated dialer.
If VPDN is required (which is determined dynamically from the CiscoIOS
image) but is not configured for this connection.
If the operating mode is CO on an SHDSL interface (ATM main interfaces
only).
If no IP address is configured on the interface and the interface is not
configured for PPPoE (ATM subinterfaces only).
The interface has an IP address but no associated PVC.
The interface has a PVC but no associated IP address and is not configured
for PPPoE.
The bridge-group command is configured on the interface.
If the main interface has one or move PVCs as well as one or more
subinterfaces.
If the main interface is not configurable (ATM subinterfaces only).
It is a multipoint interface (ATM subinterfaces only).
Reasons Why an Ethernet Interface Configuration May Be Read-Only
A previously configured Ethernet LAN or WAN interface or will be read-only and
will not be configurable in the following cases:
If the LAN interface has been configured as a DHCP server, and has been
configured with an IP-helper address.