Cisco Cisco IOS Software Release 12.2(13)ZF
9
Release Notes for the Cisco 1700 Series Routers for Cisco IOS Release 12.2(13)ZF
OL-3897-03
New and Changed Information
New and Changed Information
The following sections list the new software features supported by the Cisco 1700 series routers for
Release 12.2(13)ZF.
Release 12.2(13)ZF.
New Software Features in Release 12.2(13)ZF
The following sections describe the new software features supported by the Cisco 1700 series routers for
Release 12.2(13)ZF.
Release 12.2(13)ZF.
Frame Relay SVCs Over ISDN
This feature supports Frame Relay (FR) switched virtual circuits (SVCs) over an ISDN line. A common
use of the functionality in network topology is to put it as a backup route. This feature enables the
support of current FR SVC function on an ISDN BRI interface, as if running on a serial line. FR
switching does not work with this feature.
use of the functionality in network topology is to put it as a backup route. This feature enables the
support of current FR SVC function on an ISDN BRI interface, as if running on a serial line. FR
switching does not work with this feature.
DHCP Authorized ARP
This feature enhances the Dynamic Host Configuration Protocol (DHCP) and Address Resolution
Protocol (ARP) components of the Cisco IOS to limit the leasing of IP addresses to mobile users to
authorized users.
Protocol (ARP) components of the Cisco IOS to limit the leasing of IP addresses to mobile users to
authorized users.
A new command line interface (CLI) arp authorized command is defined to enable this feature.
Configuration Example
Consider the routers R1 and R2. R1 is the DHCP server that assigns IP addresses to the routers that are
seeking IP addresses, and R2 is configured to obtain its IP address through DHCP server. Since ARP
update is configured on R1, it will install a secure ARP entry in its ARP table. The arp authorized
command stops any dynamic ARP on that interface. R1 will send periodic ARPs to R2 to make sure that
the client is still active; the client (R2) responds with an ARP reply. The timer for the entry is refreshed
on R1 upon receiving the response.
seeking IP addresses, and R2 is configured to obtain its IP address through DHCP server. Since ARP
update is configured on R1, it will install a secure ARP entry in its ARP table. The arp authorized
command stops any dynamic ARP on that interface. R1 will send periodic ARPs to R2 to make sure that
the client is still active; the client (R2) responds with an ARP reply. The timer for the entry is refreshed
on R1 upon receiving the response.
The following example shows configuration of R1 DHCP server:
ip dhcp pool testing_pool
network 10.0.0.0 255.255.255.0
lease 0 0 20
update arp
!
interface Ethernet0
ip address 10.0.0.1 255.255.255.0
half-duplex
arp authorized
arp timeout 60
The following example shows configuration of R2 DHCP client.
interface Ethernet0/0
ip address dhcp
half-duplex