Cisco 802-IDSL - 802 Router Manual de usuario descargar pdf (Pagina 10)

Release Notes for Cisco 802 IDSL and 804 IDSL Routers for Cisco IOS Release

78-10388-01

New and Changed Information

New Features in Release 12.0(3)T

Cisco IOS Release 12.0(3)T was the first 12.0 T release to support Cisco 802 IDSL and 804 IDSL

routers. The following new software enhancements, which were introduced in Release 12.0(1)T, are

supported by the Cisco 802 IDSL and 804 IDSL routers beginning in this release.

Easy IP Phase 2-DHCP Server

With the introduction of Easy IP Phase 2, Cisco IOS software also supports Intelligent DHCP Relay

functionality. A DHCP Relay Agent is any host that forwards DHCP packets between clients and

servers. A DHCP Relay Agent enables the client and server to reside on separate subnets. If the Cisco

IOS DHCP server cannot satisfy a DHCP request from its own database, it can forward the DHCP

request to one or more secondary DHCP servers defined by the network administrator using standard

Cisco IOS ip helper-address functionality.

Time-Based Access Lists

It is now possible to implement access lists based on the time of day. To do so, you create a time range

that defines specific times of the day and week. The time range is identified by a name, and then

referenced by a function, so that those time restrictions are imposed on the function itself.

Currently, IP and IPX extended access lists are the only functions that can use time ranges. The time

range allows the network administrator to define when the permit or deny statements in the access list

are in effect. Prior to this feature, access list statements were always in effect once they were applied.

Both named or numbered access lists can reference a time range.

RIP Enhancements

Triggered extensions to IP RIP increase efficiency of RIP on point-to-point, serial interfaces. Routers

are used on connection-oriented networks to allow potential connectivity to many remote destinations.

Circuits on the WAN are established on demand and are relinquished when the traffic subsides.

Depending on the application, the connection between any two sites for user data could be short and

relatively infrequent.

There were two problems using RIP to connect to a WAN:

• Periodic broadcasting by RIP generally prevented WAN circuits form being closed.

• Even on fixed, point-to-point links, the overhead of periodic RIP transmissions could seriously

interrupt normal data transfer because of the quantity of information that hits the line every

30 seconds.

To overcome these limitations, triggered extensions to RIP cause RIP to send information on the WAN

only when there has been an update to the routing database. Periodic update packets are suppressed over

the interface on which this feature is enabled.

ISDN MIB RFC2127

The new Integrated Services Digital Network (ISDN) Management Information Base (MIB) RFC2127

has been designed to provide useful information in accordance with the IETF’s new standard for the

management of ISDN interfaces. It controls all aspects of ISDN interfaces. RFC2127 provides

information on the physical Basic Rate Interfaces (BRIs), control and statistical information for B

(bearer) and D (signaling) channels, terminal endpoints, and directory numbers.

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