C H A P T E R 16 Configuring Ip Unnumbered Interface - Cisco Catalyst 4500 Series Configuration Manual

Chapter 16 Configuring IP Unnumbered Interface
Figure 16-2
1
Type
(byte 1)
Table 16-1
Table 16-1
Field
Type
Length
Reserved
NAS IP Address
Interface
Reserved
VLAN ID
IP Unnumbered Interface with Connected Host Polling
Note This feature option is applicable to LAN and VLAN interfaces only.
In some cases, the host IP address is assigned statically. The IP Unnumbered Interfaces feature can learn
the static host IP address dynamically.
IP Unnumbered Configuration Guidelines and Restrictions
When using (or configuring) IP Unnumbered Interface, consider these guidelines and restrictions:
•
OL-25340-01
Format of the Agent Remote ID Suboption
Length Reserved
(byte 2) (bytes 3-4)
describes the agent remote ID suboption fields displayed in
Agent Remote ID Suboption Field Descriptions
For IP Unnumbered Interfaces, the following features are not supported:
Dynamic routing protocols
–
HSRP/VRRP
–
Static ARP
–
Unnumbered Interface and Numbered Interface in different VRFs
–
IP Unnumbered Configuration Guidelines and Restrictions
NAS IP address Interface
(bytes 5-8) (byte 9)
Description
Format type. The value 2 specifies the format for use with this feature.
(1 byte)
Length of the Agent Remote ID suboption, not including the type and
length fields. (1 byte)
Reserved. (2 bytes)
IP address of the interface specified by the ip unnumbered command.
(4 bytes)
Physical interface. This field has the following format:
slot (4 bits) | module (1 bit) | port (3 bits).
For example, if the interface name is interface ethernet 2/1/1, the slot
is 2, the module is 1, and the port is 1. (1 byte)
Reserved. (1 byte)
VLAN identifier for the Ethernet interface. (2 bytes)
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
12 bytes
Reserved VLAN ID
(byte 10) (bytes 11-12)
Figure 16-2.
16-3